ML20116D542
| ML20116D542 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 07/26/1996 |
| From: | Duffy J VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| BVY-96-94, NUDOCS 9608020212 | |
| Download: ML20116D542 (5) | |
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- VERMONT YANKEE -
NUCLEAR POWER CORPORATION
.. Ferry Road, Brattleboro, VT 05301-7002 ftEPLY TO ENGINEERING OFFICE 580 MAIN STREET BoLToN. MA 01740 (508) 779-6711 July 26,1996 BVY 96-94
. United States Nuclear Regulatory Commission ATIN: Document Control Desk Washington, DC 20555
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b) Letter, VYNPC to USNRC, BVY 96-58, dated May 28,1996 (c) Letter, USNRC to VYNPC, NVY 96-117, dated June 28,1996
Subject:
Response to Request for Additional Information Regarding Vermont Yankee Request for Exemption from 10 CFR Part 50, Appendix R In Reference (b), Vermont Yankee requested exemption from the requirements of 10CFR50, Appendix R, Section III.G, " Fire protection of safe shutdown capability," to permit use of Rockbestos Firezone*R fireproof cable in plant areas that require enclosing cables in a fire barrier having a 1-hour fire rating.
The plant areas identified in the exemption request were the Cable Vault and the 280 foot elevation of the Reactor Building. Since submitting our exemption we have decided to implement a plant design
, modification which will eliminate reliance on the fire resistant cable in the Motor-Generator set area on the 280 foot elevation of the Reactor Building.' As a result, the exemption request is now applicable to the routing of Rockbestos Firezone*R cable only in the Cable Vault.
In Reference (c), the NRC requested additional information needed to complete review of our exemption request. The requested information is attached.
We trust that the information provided is acceptable; however, should you have any questions, please
. contact this office.
Sincerely, VERMONT YANKEE NUCLEAR POWER CORPORATION 01007G ,, h ames J. Du y Licensing Engineer h
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Attachments c: USNRC Region I Administrator fL- USNRC Resident Inspector- VYNPS USNRC Project Manager- VYNPS 9608020212 960726 PDR ADOCK 05000271 F PDR
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-e VERMONT YANKEE NUCLEAR POWER CORf' ORATION l
United States Nuclear Regulatory Commission j
' July 26,1996
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l Attachment 1 '
Page1of4 Request for Additionallnformation Vermont Yankee Nuclear Power Station Request for AdditionalInformation #1 Underwriter's Laboratory Report on Fire Resistant Cables, File R10925-1, dated April 10,'1984.
Vermont Yankee Resnonse to Request for Additional Information #1 Subject report is included as . Attachment 2.
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Request for AdditionalInformation #2
. Fire Test Standard used to qualify the fire resistant cables.
Vermont Yankee Resnonse to Request for Additional Information #2 As identified on page 1 of the Underwriter's Laboratory Report on Fire Resistant Cables (Attachment 2),
"The floor assembly was subjected to fire exposure with the furnace temperatures controlled in accordance with the standard time-temperature curve outlined in the Standard for Fire Tests of Building Construction and Materials, ASTM El19 (UL 263, NFPA 251). Following the fire exposure, the assembly was subjected to the impact, erosion and cooling effect of a water hose stream test."
Request for AdditionalInformation #3 Detailed drawings of the fire areas through which the cable is passing. Clearly mark the route of the cables, and clearly label all equipment and components that are in the fire areas.
Vermont Yankee Resnonse to Reaued for Additional Information #3 As discussed in the cover letter, our exemption request has been revised such that the Cable Vault is the only fire area for which an exemption to use the fire resistant cable is being requested. Attachment 3
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provides a mark-up of the Cable Vault with the route of the cables and all major equipment and components clearly identified.
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Request for AdditionalInformation #4 Describe how the cables are routed (e.g., type of raceway) and how the cables and raceways are supported. I Vermont Yankee Resnonse to Request for Additional Information #4 The cables of concern consist of four stainless steel sheathed cables. The cables, which are grouped '
together throughout their run in the Cable Vault, enter through the floor of the Cable Vault along the east wall near panel DC-2. The cables rise vertically about 6 feet, travel about 45 feet horizontally to the south wall of the Cable Vault, and enter the Reactor Building through a block out. The cables are located between 16 inches and 30 inches below the ceiling throughout the horizontal run. The cables are not located in any cable trays and they are not attached to the side rails of any trays. One shoit section of i cable tray at the north end of the horizontal run is routed perpendicular to, and over, the fire resistant
VERMONT YANKEE NUCLEAR POWER CORPORATION United States Nuclear Regulatory Commission
~ July 26,19%
Attachment i Page 2 of 4 cables. Several conduits are also routed parallel to and over the fire resistant cables. The routing of the cables and methods of support are described below and depicted on Attachment 4.
The cables are attached to 12 gauge light metal framing members and associated hardware (i.e., unistrut type). Two supports, bolted directly to the east wall of the Cable Vault, are used in the vertical portion of the cable run. Eleven supports, spaced about four feet to five feet apart, are used in the horizontal portion of the nm, with the cables attached to the top of short, horizontal members. The horizontal sections are bolted to vertical framing members which are attached to the floor, ceiling, or overhad conduits.- Three of the vertical supports are bolted directly to the ceiling above. Four of the vertical supports are attached to conduits, and the conduits are attached to the ceiling by 3/8 inch (minimum) diameter threaded rods and concrete inserts. Three of the vertical supports also form part of the support system for the floor-to-ceiling cable trays that run parallel to and below the fire resistant cables. The three vertical supports that form part of the cable tray support system (which is described in more detail below) are bolted to the floor, with one of the supports also bolted to the ceiling. One support is framed into the block out where the cables penetrate through the south wall of the Cable Vault.
The floor-to-ceiling cable tray system running parallel to and under the fire resistant cables is supported by a total of nine vertical 12 gauge light metal framing members, spaced about 4 feet to 5 feet apart, on both sides of the tray system. Horizontal supports, provided underneath each cable tray, are bolted to the vertical members. The vertical members are all bolted to the floor and most are also bolted to the ceiling. Fire rated barriers are not required for any of the cables in the cable trays running parallel to the fire resistant cables.
Request for Additional Information #5 Verify that the cable supports and raceway supports will not fail if exposed to a fire.
Request for Additional Information #6 Verify that the failure under fire exposure of a structure, system or component in the vicinity of the cables will not damage the fire resistant cables.
Vermont Yankee Responses to Request for Additional Information #5 & #6 The response to RAI No. 5 and No. 6 is divided into two parts. The first evaluates the fire protection capabilities available in the Cable Va.ilt to limit the severity of postulated fires such that failure ofcable supports and structures, systems, or components in the area are not a likely event. Following this is a discussion of postulated sequences of cable support failures and failure of structures, systems, or components in the area and the likely impact of such failures on the capability of the fire resistant cables to perform their intended function. Each discussion is provided separately below.
Evaluation of Fire Protection Canabilities The Cable Vault, a reinforced concrete structure, is a separate fire area contained within the control building. The Cable Vault contains instrumentation, control and power cables in cable trays and conduit that are relied on for safe shutdown of the plant. The fire loading consists predominantly of cable insulation in cable trays which results in an equivalent fire severity of under 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. Alternate shutdown capability is provided to ensure safe shutdown given a Cable Vault fire.
VERMONT YANKEE NUCLEAR POWER CORPORATION United States Nuclear Regulatory Commission July 26,1996 Attachment 1 Page 3 of 4 Fire protection features in the Cable Vault are provided in accordance with defense-in-depth principles.
L Fire protection features include automatic detection and suppression systems and portable extinguishers in the Cable Vault, and a hose station outside the main entrance door, for fire brigade use. A fire of the 1
! duration and magnitude required to result in failure of supports for the cable tray system, overhead l
. conduits, and/or the fire resistant cables is considered to be an unlikely event. The bases for this l
- assessment are described below. 1 Cable Vault access is controlled by key card and is not a normal travel route to any other plant location. !
- The Cable Vault is designated as a Fire Control Area per administrative procedures. A Fire Control Area l
requires a Fire Protection Control Permit for introduction of significant quantities of combustible or l
[ flammable materials into the area. A Fire Control Area also requires a Hot Work Control Permit for any j hot work activity in the area. The possibility and impact of transient combustible material fires in the
- Cable Vault are, therefore, considered to be minimal.
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! Postulated fires in the Cable Vault would involve cable insulation in the cable tray system. Such a fire j, would develop slowly and generate a significant amount of smoke in the early stages of the fire.
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< The Cable Vault is provided with fall area detection system coverage (27 ionization detectors mounted at
{ ceiling level) that would detect a postulated fire in its incipient stages. Activation of a single detector transmits an alarm to the Control Room and sounds an alarm outside the :oom. Activation of a second
- detector initiates an evacuation alarm inside the room and a 75 second timer prior to discharge of the
- total flooding CO 2extinguishing system. The CO system2 can be manually activated from outside the
[ main entrance door to the room, and a manually activated 100% reserve capability is also provided j through a cross-connect with the West Switchgear Room system. Control Room alarms due to automatic j or manual detection or CO2suppression system activation will result in prompt fire brigade response.
}: Portable extinguishers are located in the Cable Vault, and a hose station is located outside the northwest entrance door to the room, for manual fire fighting purposes.
l Reasonable assurance is therefore provided that postulated fires in the Cable Vault would be detected in
' the incipient stages, with actuation of the total flooding CO 2suppression system to extinguish the fire.
The fire brigade would respond rapidly to the Cable Vault upon receipt of an alarm in the Control Room to begin manual fire fighting activities as required. Based on the automatic detection and suppression systems provided for the area, and rapid fire brigade response for manual fire fighting activities, i postulated fires in the Cable Vault would be detected, controlled, and extinguished prior to temperatures rising to a level that could challenge the structural support capabilities of the fire resistant cables, cable tray network, and overhead conduits. Additional bases for this position are provided in the following discussion.
Evaluation of Structures. Systems. Comoonents. and Cable Suonort Failures The fire resistant cable is somewhat flexible, not rigid. As documented in the test report of the fire resistant cable, the cables are able to support significant load without damage. He as-tested fire resistant cables were placed in the bottom of a ladder back cable tray, and the tray was then filled with standard cables to represent a typical fuel loading that could present an installed hazard to the cables. At about the 40 minute point in the fire test, the 16 gauge galvanized steel tray rungs began to separate from the side rails, and the 14 gauge side rails began to bow inwards. During the last 20 minutes of the test exposure, most of the tray rungs disengaged from the side rails. The fuel load cables in the tray on top of
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VERMONT YANKEE NUCLEAR POWER CORPORATION
. United States Nuclear Regulatory Commission July 26,1996
, Attachment 1 i- Page 4 of 4 l
i l the fire resistant cables deflected downward, with most of the weight of the fuel load cables supported by j the fire resistant cables. The test report documents that the stainless steel sheath on each of the fire resistant cables did not appear to be damaged by the applied stresses.
[ Failure of the conduit clips that attach the vertical run of the fire resistant cable to the supports, which are j bolted to the east wall of the Cable Vault, could cause the cables to disengage from the wall and sag i towards the first horizontal support. Failure of the conduit clips that attach the horizontal run of the
] cables to the supports will not adversely impact on the cables since they are supported on top of the
- supports to which they are attached. The conduit clips act to laterally support the horizontal run of the .
fire resistant cables in place during seismic events and do not provide any dead weight support. The j applied ' stresses to the fire resistant cables by failure of the conduit clips would be bounded by the stresses applied by the fuel load cables in the fire test. Therefore, failure of the conduit clips during postulated fires will not adversely impact the capabilities of the fire resistant cables to perform their intended function.
The support failures that could be of concern are those that could cause gross collapse of the conduits and single cable trcy that are above the fire resistant cables or gross collapse of the cable tray network in the Cable Vault. Collapse of the conduits and/or cable tray above the fire resistant cables could -
potentially cause physical damage to the cables. Collapse of the cable tray network could pull down the entire routing of the fire resistant cables, potentially damaging the cables and/or pulling the cables out of the barriers through which they pass.
Collapse of the overhead conduits or cable tray, or collapse of the cable tray network, are catastrophic failures that require a significant fire exposure in order to occur. As identified previously, the existing detection and suppression systems installed in the Cable Vault should detect, control, and extinguish '
postulated fires in the Cable Vault prior to temperatures reaching a level that would challenge the structural support capabilities of the fire resistant cables, cable tray network, and overhead conduits.
Therefore, catastrophic failure of the support systems is considered to be unlikely.
Additionaljustification for this position is contained in the fire resistant cable test report. The test report documents that at about the 40 minute point in the test, the 16 gauge tray rungs began to separate from the side rails, and the 14 gauge side rails began to bow inwards. Typically,12 gauge framing members bolted to the floor and/or ceiling is' used in the Cable Vault to support cable trays. Minimum 3/8 inch j diameter threaded rods used to support conduit are typically either embedded in or bolted to the concrete j ceiling. The existing tray and conduit support system should be expected to last at least as long in an 1 ASTM El19 exposure fire as the 16 gauge tray rungs and the 14 gauge side rails in the fire resistant l cable fire test since the tray / conduit support systems are of a stronger gauge than the tray rungs and side j
' rails included in the fire test. Therefore, postulated fires in the Cable Vault would have to intensify 1 unimpeded for a significant period of time in order to cause gross failure and collapse of the cable tray or ,
conduit support systems.
. 1 In summary, given the existing fire protection features and the layout of conduits, cable trays and the fire resistant cable support system in the Cable Vault, detection and suppression of postulated fires would occur well before any challenge to the support capabilities of conduits and cable trays in the vicinity of the fire resistant cables.
! VERMONT YANKEE NUCLEAR POWER CORPORATION l
Attachment 2 Underwnter's Laboratory Report on Fire Resistant Cables File R10925-1 dated April 10,1984 l
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UNDERWRITERS LABORATORIES INC' an independent, not-for-profit organization testingfor public safety File R10925-1 Project 84NK2320 April 10, 1984 REPORT on FIRE RESISTANT CABLES The Rockbestos Company, Division of CEROCK Wire & Cable Group, Inc.
New Haven, Connecticut Copyright 1984 Underwriters Laboratories Inc.
Underwriters Laboratories Inc. authorizes the above named company to reproduce this Report provided it is reproduced in its entirety.
In no event shall Underwriters Laboratories Inc. be responsible to anyone for whatever use or nonuse is made of the information contained in this Report and in no event shall Underwriters Laboratories Inc., its employees, or its agents incur any obligation or liability for damages, including, but not limited to, consequential damages, arising out of or in connection with the use, or inability to use, the information contained in this Report.
Information conveyed by this Report applies only to the specimens actually involved in these tests. Underwriters Laboratories Inc.
has not established a factory follow-up service program to determine the conformance of subsequently produced material nor has any provision been established to apply any registered mark of Underwriters Laboratories Inc. to such material.
The issuance of this Report in no way implies Listing, Classification or other Recognition by Underwriters Laboratories Inc. and does not authorize the use of UL Listing or Classification Markings or any other reference to Undemriters Laboratories Inc. on or in connection with the product r system.
Look For The @ Listing or Classification Mark On The Product
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File R10925-1 Page i Issued: 4-10-84 bEEEEbEE This Report describes a testing program which was undertaken to develop information for the assessment of fire resistant cables in Redundant Safety Trains as outlined in " Fire Protection Program For Operating Nuclear Power Plants" (Appendix _R to 10 CFR 50). The testing progImn consisted of a full-scale fire test investigation and an adjun.:t small-scale fire test. These tests provided data on the electrice.1 characteristics of the fire resistant cable samples under control;ed fire exposure conditions and during an extended cool-down' period.
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i Page ii Issued: 4-10-84 File R10925-1 t
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'T a
_T _A _B _L _E _O _F _C _O _N _T _E _N _T _S
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i Abstract................................................ 11 Tab le O f Content s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 I General................................................. 4 i
- Description............................................ 4
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Materials......................................... 4 .
Full-Scale Test Assembly.....................
i Small-Scale Test Assembly..................... 8 l 8
l Erection Of Test Assemblies.......................
8
$ Full-Scale Test Assembly......................
14
- Small-Scale Test Assembly.....................
15 Test Record No. 1, Full-Scale Test Assembly............. 15 Fire Endurance Test................................ 15 l Sample........................................
i 15 j Method........................................
l Results.......................................'17 17 l
i- Character And Distribution Of Fire.......
17 4 . Observations During Test................. 18 l
Circuit Integrity.......................
18 l i Initial Hose Stream Test........................... 18 ;
Sample........................................
19- l i Method........................................ ;
19 l Results....................................... I 19
' Extended Cool-Down Period.......................... 20 l 4 Second Hose Stream Test............................ 20 Sample........................................
l 20 1 Method........................................ '
20 I Results....................................... '
i l ' Observations After Tests........................... 20 21 Discussion......................................... 25 Test Record No. 2, Small-Scale Test Assembly........... 25 l
Fire Endurance Test................................ 25
- Sample........................................
25 7 Method........................................ 26 Results....................................... 26 7
Character And Distribution Of Fire....... 27 Observations During Test.................
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' Temperatures Of The Cables............... 27
- Leakage Current Measurements............ 30
- i. Summary................................................
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_A _P _P _E _N _D _I _C _E _S t
i Appendix A, Electrical Circuit Measurements, Al Full-Scale Test Assembly...............................
i Appendix B, Insulation Resistance Measurements, B1
' Full-Scale Test Assembly...............................
Appendix C, Dielectric Voltage-Withstand Tests, C1 Full-Scale Test Assembly...............................
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File R10925-1 Page lii Issued: 4-10-84 1
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Appendix D, Cable Temperature Measurements, !
Small-Scale Test Assembly.............................. D1 l Location Of Thermocouples.......................... D1 Temperatures Of-The Cables......................... D1 Appendix E, Instrument Calibration Records.............. El Instruments Supplied By Underwriters Laboratories'Inc.................................. El Full-Scale Test Assembly...................... El Furnace Temperature Recorder............. El Automatic Data Logger.................... El Ammeter.................................. El Voltage Source........................... El Water Pressure Gauge..................... El Small-Scale Test Assembly..................... E2 Furnace Temperature Recorder............. E2 Cable Temperature Recorder............... E2 Instruments Supplied By The Rockbestos Co.......... E3 i Full-Scale Test Assembly...................... E3 Digital Ammeter.......................... E3 Meggering Equipment...................... E3 Small-Scale Test Assembly..................... E3 Digital Multimeters...................... E3 t
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File R10925-1 Page 1 Issued: 4-10-84 g}Nj3AL The subject of this Report is the fire test investigation of fire resistant electrical cables installed in cable trays, conduits and air drops beneath a floor assembly. The purpose of the investigation was to develop information which may be used to determine whether-the electrical cables manufactured by The Rockbestos Company meet the specifications for Redundant Safety Trains outlined in " Fire Protection Program For Operating Nuclear Power Plants" (Appendix R to 10 CFR 50). We understand that the information developed in this investigation is to be submitted only to the United States Nuclear Regulatory Commission (NRC), -
American Nuclear Insurers (ANI), Nuclear Mutual Limited (NML) and firms concerned with utility installations for their consideration as to the use of the Rockbestos cables in redundant safety trains as specified in Appendix R-to 10 CFR 50 for use in nuclear generating stations under the jurisdiction of the United ;
. States Nuclear Regulatory Commission.
The test program consisted of constructing a floor assembly with various cable tray and conduit systems containing fire resistant cables. In addition, nonfire resistant cables were i installed in the cable tray systems to simulate the fuel loading I which would be present in actual site installations. The floor assembly was subjected to fire exposure with the furnace temperatures controlled in accordance with the standard time-temperature curve outlined in the Standard for Fire Tests of Building Construction and Materials, ASTM E119 (' U L 263, NFPA No. 251). Following the fire exposure, the. assembly was subjected to the impact, erosion and cooling ef fect of a water hose stream test. After an extended cool-down period, the assembly was subjected to a second water hose stream test.
Immediately before the fire endurance test, the fire resistant cables were energized with predetermined steady-state ac. electrical currents. The cables remained energized throughout the fire exposure except for a 10 s period immediately preceding an inrush current test on each fire resistant cable. Following the fire endurance test, the cables were deenergized for the water hose stream test. Following the water hose stream test, the cables were again energized with predetermined steady-state ac electrical currents. The cables remained energized throughout a 93 h extended cool-down period except for 10 s periods immediately preceding each of four supplemental' inrush current tests. Following the 93 h extended cool-down period, the cables were deenergized for the second water hose stream test.
Immediately following the second water hose stream test, the cables were subjected to a final inrush current test.
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- In addition to monitoring ac currents in each of the fire resistant cables, each conductor of each fire resistant cable was energized with a de voltage and monitored for electrical faults.
A total of six fire resistant cable. types were tested in a total of twelve configurations. Nine of the test configurations were included to develop information for consideration as to the use of the Rockbestos cables in redundant safety trains as specified in Appendix R to 10 CFR~50. The remaining three test configurations were included to develop engineering information of a preliminary nature for use by The Rockbestos Company. Only the data pertinent to the nine fire resistant cable configurations intended for consideration as to use in redundant safety trains, as specified in Appendix R to 10 CFR 50, are included herein. These nine fire resistant cable configurations ,
are listed below: )
- 1. 3/C-No. 14 AWG' power cable with stainless steel sheath i (Product Code E30-0211) in conduit-to-cable tray transition. i l
- 2. 3/C-No. 14 AWG power cable with stainless steel sheath (Product Code E30-0211) in cable tray.
- 3. 3/C-No. .14 AWG power cable without stainless steel sheath- (Product Code E30-0208) in conduit. I
- 4. 3/C-No. 6 AWG power cable with stainless steel sheath {
(Product Code ' E30-0210) in conduit-to-cable tray transition. !
- 5. 3/C-No. 6 AWG power cable with stainless steel sheath (Product Code E30-0210) in cable tray. J l
- 6. 3/C-No. 6 AWG power cable without stainless steel '
sheath (Product Code E30-0204) in conduit.
- 7. 2/C-No. 14 AWG shielded twisted pair (S.T.P.)
instrumentation cable with stainless steel sheath (Product Code E30-0212) in conduit-to-cable tray transition.
- 8. 2/C-No. 14 AWG S.T.P. instrumentation cable with stainless steel sheath (Product Code E30-0212) in cable tray.
- 9. 2/C-No. 14 AWG S.T.P. instrumentation cable without stainless steel sheath (Product Code E30-0209) in conduit.
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File R10925-1 Page 3 Issued: 4-10-04 )
Following the full-scale floor fire test investigation, a second fire test was conducted on two samples of the fire resistant cables installed beneath a 3 by 3 ft concrete floor slab. During the small-scale fire endurance test, each of the fire resistant cables was energized with rated voltage and monitored to measure leakage current. l The fire endurance and hose stream tests were supplemented with other tests and examinations which provided additional information relative to the electrical performance i l
characteristics of the fire resistant cables.
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File R10925-1 Page 4 Issued: 4-10-84 -
EEEE31P11pg MATERIALS:
The following is a description of the materials used in the test assemblies.
FULL-SCALE TEST ASSEMBLY Floor Assembly - The floor assembly consisted of five separate steel-reinforced vermiculite concrete slabs. Two of the slabs measured 5 ft, 2 in. by 13 ft, 8 in. by 8 in. thick. The remaining three slabs were 1 ft, 8 in. by 13 ft, 8 in. by 8 in.
thick.
Cable Tray System - The nominal 24 in, wide open-ladder cable tray consisted of channel-shaped siderails and boxed-channel rungs. The siderails were 6-1/2 in. deep and-were formed of 0.082 in. thick (No. 14 gauge) galvanized steel. The top'and bottom flanges of the siderail were 1-1/4 in wide. -The boxed-channel' rungs were 1-1/8 in, wide by 5/8 in._ deep and were formed of 0.066 in thick (No. 16 gauge) galvanized steel. The rungs were spaced 9 in. OC and were welded to the web of the-siderails at each end. The loading depth of the' tray was 5-3/4 in. The cable tray straight lengths were manufactured by Metal Products Division, United States Gypsum Company and designated "GLOBETRAY" (Catalog No. PLHD-SSO 9-24 00-6-12) .
The nominal 24 in, wide 90* inside vertical riser fittings used in the cable tray system each had an inside radius of 12 in., an outside radius of 18-1/2 in.., and a. tangent length of 3 in. .The siderail members for each inside vertical riser were -
channel-shaped in cross-section with a web height of 6-1/2 in, and a top and bottom flange width of 1/2 in. The siderail members were formed of 0.082 in. thick (No. 14 gauge) galvanized steel. The inside vertical riser fittings were each provided with the same boxed-channel rungs used in the straight lengths.
The rungs were spaced nominally 6 in. OC and were welded to the web of the siderails at each end. The inside vertical riser fittings were manufactured by Metal Products Division, United States Gypsum Company and designated "GLOBETRAY" (Catalog No. PLED-IV90-2 412-6) .
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File R10'925-1 Page 5 Issued: 4-10-84 The nominal 24 in, wide 90' outside vertical riser fitting used in the cable tray system had an inside radius of 12 in., an
- outside radius of 18-1/2 in, and a tangent length of 3 in. The siderail members were channel-shaped in cross-section with a web height of 6-1/2 in. and a top and bottom flange width of 1/2 in.
The siderail members were formed of 0.082 in, thick 1 (No. 14 gauge) galvanized steel. The outside vertical riser fitting was provided with the same boxed-channel rungs used in the straight lengths of cable tray. The rungs were spaced nominally 6 in. OC and were welded to the web of the siderails at each end. The outside vertical riser fitting was manufactured by
. Metal Products Division, United States Gypsum Company and designated "GLOBETRAY" (Catalog No. PLHD-OV90-2412-6) .
4 The flat splice plates used to join the inside and outside vertical riser fittings with the cable tray straight sections
- consisted of 4 by 6 by 0.107 in. thick (No. 12 gauge) galvanized steel plates. Each splice plate was provided with eight 3/8 in, diameter by 5/8 in. long slots which aligned with the four 3/8 in, diameter holes drilled at each end of the vertical riser
- and straight section cable tray siderails. The splice plates were manufactured by Metal Products Division, United States Gypsum Company and designated "GLOBETRAY" (Catalog 4 No. P-RSPST-6-H). Each splice plate was provided with 3/8 in.
diameter truss-head ribbed shank bolts and serrated flanged nuts.
Steel Conduit Systems - The nominal 3 in. d'iameter Trade Size rigid steel conduits were 3.500 in. in diameter with a wall i thickness of 0.216 in. Each of the three nominal 3 in. diameter rigid conduit systems consisted of two 90' elbows with threaded ends, one nominal 10 ft straight length with threaded ends, two straight lengths each having one threaded end, four threaded steel couplings and two set-screw fiber bushings.
The nominal 1-1/2 in diameter Trade Size rigid steel conduit used in the conduit-to-cable tray transition was 1.900 in. in diameter with a wall thickness of 0.145 in. The conduit system consisted of one 90' elbow with threaded ends, a straight length having one threaded end, two threaded steel couplings and one set screw fiber bushing.
The nominal 3/4 in. diameter Trade Size rigid steel conduits used in the two conduit-to-cable tray transitions were 1.050 in.
in diameter with a wall thickness of 0.113 in. Each of the two conduit systems consisted of one 90' elbow with threaded ends, one straight length having one threaded end, two threaded steel couplinge and one set-screw insulated grounding bushing.
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File R10925-1 Page 6 Issued: 4-10-84 The conduits and elbows each bore the UL Listing Mark. The straight conduit lengths and couplings were supplied by GPU Nuclear Corporation, Parsippany, New Jersey. The conduit elbows and bushings were purchased locally.
Conduit Terminations - The conduit terminations used in conjunction with the nominal 1-1/2 in. and 3/4 in. diameter Trade Size rigid steel conduits for the conduit-to-cable tray transitions each consisted of a stainless steel compression shell, a brass grommet and a stainless steel coupling nut. The conduit termination fittings were manufactured by Rowe
- Industries, Toledo, Ohio and designated Type 3RT9006 (nominal 1-1/2 in diameter Trade Size fitting) and Type 2RT9006 (nominal 3/4 in. diameter Trade Size fitting).
Trapeze Support - The trapeze supports each consisted of two nominal 1/2 in. diameter threaded steel rods, an L4x3x1/2 in.
thick structural steel angle and steel nuts.
Fire Resistant Cables - Six types of fire resistant cables were included in the fire test assembly. The six cable types were: 3/C-No. 14 AWG with stainless steel sheath (Product ;
Code E30-0211) ; 3/C-No. 6 AWG with stainless steel sheath (Product Code E30-0210); 2/C-No. 14 AWG shielded twisted pair (S.T. P. ) with stainless steel sheath (Product Code E30-0212) ;
3/C-No. 14 AWG without stainless steel sheath (Product i Code E30-0208); 3/C-No. 6 AWG without stainless steel sheath "
(Product Code E30-0204); and 2/C-No. 14 AWG S.T.P. without stainless steel sheath (Product Code E30-0209) .
The six cable types, designated Firewall FR SR Class 1E Electric Cables, were manufactured by The Rockbestos Company, Division of CEROCK Wire & Cable Group, Inc., New Haven, Connecticut. No marking was present on the cable jackets or sheaths.
Fuel Loading Cables - Four types of fuel loading cables were l used in the cable tray systems. The cable types used were 3/C-No. 2 AWG power cables, 9/C-No. 12 AWG control cables, 19/C-No. 12 AWG control cables and 37/C-No. 12 AWG control cables.
l l
l File R10925-1 Page 7 Issued: 4-10-84 Each conductor of the 3/C-No. 2 AWG power cable consisted of seven 0.'097 in. diameter copper strands stranded together and covered with a mylar wrap and cross-linked polyethylene (KLPE) insulation. The outside diameter of each conductor was 0.403 in.
The fillers within the cable construction consisted of polyester 6 strands. The fillers and conductors were encased in a tissue paper wrap and covered with a Hypalon jacket. The outside diameter of the cable was 1.036 in. The cable jacket was marked "2 AWG 3/C ROCKBESTOS R 600V FIREWALL R III XHHW NEC TYPE TC (UL) . "
- Each conductor of the 9/C-No. 12 AWG cable consisted of seven 0.031 in. diameter copper strands stranded _together and ;
covered with ethylene propylene rubber insulation and a hypalon jacket. The outside diameter of each conductor was 0.196 in. !
The fillers within the cable construction consisted of polyester strands. The fillers and conductors were encased in a scrim paper wrap and covered with a hypalon jacket. The outside
. diameter of the cable was 0.858 in. The cable jacket was marked
" BOSTON INSULATED WIRE AND CABLE COMPANY, (1980) 9/C-12 AWG, EPR/HYP INSUL, HYPALON JKT. 600 v."'
Each conductor of the 19/C-No. 12 AWG cable consisted of seven 0.029 in. diameter copper strands stranded together and covered with polyethylene insulation and a PVC jacket. The ,
outside diameter of each conductor was 0.156 in. The conductors I were enca' sed in a mylar wrap Tnd covered with a PVC jacket.- The outside diameter of the cable was 0.935 in. The cable jacket was !
marked " ROME CT-B CONTROL CABLE 19/C 12 AWG CU 600 V."
Each conductor of the 37/C-No. 12 AWG cable consisted of seven 0.030 in, diameter copper strands stranded together and covered with XLPE insulation. The outside diameter of each conductor was 0.153 in. The conductors were encased in a mylar !
wrap and covered with a PVC jacket. The outside diameter of the cable was 1.250 in. The cable jacket was marked " ROME CABLE 37/C ,
12 AWG CU 600 V XLP TYPE B CONTROL CABLE." l The 19/C- and 37/C-No. 12 AWG control cables were purchased ]
Jocally. The 3/C-No. 2 AWG and the 9/C-No. 12 AWG cables were supplied by GPU Nuclear Corporation, Parsippany, New Jersey. The reel containing the 3/C-No. 2 AWG cable bore a pressure-sensitive adhesive label reading "GPU NUCLEAR TMI, Real Number #2, B/M ,
Footage 896', P.O. Number , Date Received ,
S.S.N. 118-764-2900-1." The reel containing the 9/C-No. 12 AWG cable bore a pressure-sensitive adhesive label reading "GPU NUCLEAR TMI, Reel Number EJ0018, B/M FR-9JJ, Footage 593', P.O.
Number 89145, Date Received 9-8-80, S.S.N. 118-753-7000-1."
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! File R10925-1 Page 8 Issued: 4-10-84 .
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) Cable Ties - The ties used to secure the fire resistant and ,
fuel loading cables in place consisted of No. 14 SWG (0.080 in. '
diameter) steel wire ties and stainless steel cable straps. The f stainless steel cable straps were purchased from Metal Products ~
Division, United States Gypsum Company (Catalog Nos. CT-2000-SS ,
and CT-4375-SS). l SMALL-SCALE TEST ASSEMBLY Floor ~ Assembly - The floor assembly consisted of a nominal
, 36 by 36 by 2 in. thick steel-reinforced normal weight concrete slab.
Fire Resistant Cables - Two cable types were used in the test assembly. The cable types used were 3/C-No. 14 AWG cable with stainless steel theath (Product Code E30-0211) and 2/C-No. 14 AWG S.T.P. cable with stainless steel sheath (Product Code E30-0212). The cable samples were cut from the same reels ;
of cable used in the full-scale floor fire test assembly. :
Cable Ties - The ties used to band the coils of fire !
resistant cables were stainless steel cable straps purchased from #
Metal Products Division, United States Gypsum Company (Catalog l No. CT-4375-SS). -
ERECTION OF TEST ASSEMBLIES: ;
FULL-SCALE TEST ASSEMBLY I The full-scale floor fire test assembly was constructed in accordance with the methods specified by the submittor, as shown in ILLS. 1 through 9. The construction of the test assembly was observed by members of the technical and engineering staff of ,
Underwriters Laboratories Inc.
Nominal 6 by 6 by 1/2 in. thick structural steel angles were placed along the walls of the test frame such that the top of the '
horizontal leg was 8 in, below the top edges of the test frame. :
The five steel-reinforced vermiculite concrete floor slabs were then installed in the test frame. Prior to installation of the floor slabs, nominal 1-1/4 in. thick mineral-wool batts were placed over the structural steel angles to form a smoke and heat seal. The average bearing of each floor slab on the structural steel angles was 4-1/2 in. A 6 in. separation was maintained >
between adjacent floor slabs to accommodate the vertical legs of I the' cable tray and conduit systems. !
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! File R10925-1 Page 9 Issued: 4-10-84 I
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i Two W4x13 steel beams, 17 ft long, were placed over the top
, of the floor slabs. The beams rested on and were secured to the 4
projecting steel reinforcement of each slab (bottom chord of i inverted Type 8H2 steel joists) to prevent differential deflection of the various slabs during fire exposure.
1 The locations of the various cable trays and conduits in the 4
floor assembly are shown in ILL. 1.
i The trapeze supports for the cable trays and conduits were l- _ installed as shown in ILLS. 1, 2, 4 and 5. , ;
i
- The nominal 24 in, wide main cable tray system and the j auxiliary cable tray receiving the tray-to-tray cable air drops 4
were assembled and installed as shown in ILL. 2. The 24 in, wide ,
main cable tray system was assembled with flat splice plates in I conjunction with 3/8 in, diameter truss-head ribbed shank bolts 1 and serrated flanged nuts. The main cable tray system and-l auxiliary cable tray were suspended from the trapeze supports.
j In addition, the cable' tray system was suspended by means of I
- nominal 2 by 2 by 1/4 in. thick steel angles, 24 in. long, i spanning across.the projecting steel reinforcement of the floor i slabs (bottom chord. of inverted Type 8H2 steel joists) and welded
- to,the cable tray siderails.
~
} The three nominal 3 in. diameter rigid steel conduit systema j
were assembled and installed as shown in ILL. 4. .The three conduit systems rested on the trapeze supports and were additionally supported by means of nominal 2 by 2 by 1/4 in. I
!' thick steel angles, 24 in. long, spanning across the projecting ,
j steel reinforcement of the floor slabs and welded to the sides of
- the conduits. -
! Prior to installation of the main cable tray system, i auxiliary cable tray and the three nominal 3 in. diameter rigid steel conduits, a nominal 1 in thickness of ceramic fiber
, blanket was placed on the 3 in, wide bearing leg of the trapeze j support angle such that the cable raceways did.not rest directly
! upon the. steel trapeze supports.
i
< The two nominal 3/4 in. diameter rigid steel conduits and i the nominal 1-1/2 in, rigid steel conduits for the j conduit-to-cable tray transitions were' installed as shown ILL. 5.
The elbow of each conduit rested on and was welded to the 3 in.
j- leg of the trapeze support angle. Each conduit was additionally supported by means of nominal 2 by 2 by 1/4 in. thick steel J
angles, 24 in. long, spanning acrocs the projecting steel j reinforcement of the floor slabs and welded to the conduits.
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File R10925-1 Page 10 Issued: 4-10-84 ,
The 6 ft, 9 in, long auxiliary cable tray was provided with a 41.5 percent fill of randomly-laid fuel loading cables. Each cable was cut into a 6 ft, 9 in. length and'was-laid flat in the cable tray. The type and quantity of fuel loading cables in the auxiliary cable tray are tabulated below:
Cable Cable Insulation Jacket Cable Type Material Material Cable OD Quantity 3/C-No. 2 AWG XLP HYP 1.036 in. 16 pieces 9/C-No. 12 AWG EPR-HYP HYP 0.858 in. 16 pieces l 19/C-No. 12 AWG PE PVC 0.935 in. 36 pieces 37/C-No. 12 AWG XLP PVC 1.250 in. 8 pieces The 3/C-No. 14 AWG, 3/C-No. 6 AWG and the 2/C-No. 14 AWG S.T.P. cables with the stainless steel sheaths (Product Code E30-0211, -0210 and -0212, respectively) were installed in the bottom of the main cable tray system and air-dropped into the auxiliary cable tray as shown in ILLS. 1, 2 and 3. The stainless steel sheathed. cables were secured to the rungs of the main cable tray system and to the top layer of fuel loading cables in the auxiliary cable tray with stainless steel cable straps. The 3/C-No. 6 AWG cable and the 2/C-No. 14 AWG S.T.P. cable were installed such that the stainless steel sheath was in contact with the siderail of both the main cable tray system and auxiliary cable tray. The 3/C-No. 14 AWG cable was installed along the longitudinal centerline of the main cable tray system and auxiliary cable tray.
After installation of the stainless steel sheathed cables,.a 41.5 percent fill of randomly-laid fuel loading cables was installed in the main cable tray system. The type and quantity of fuel loading cables in the main cable tray system was identical to that installed in the auxiliary cable tray. The fuel loading cables were installed along the entire length of the cable tray system beneath the floor and terminated approximately 2 in, below the underside of the floor. The vertical runs of cable in the main cable tray system were secured to the cable tray rungs with stainless steel cable straps and steel wire ties.
Each of the three fire resistant cables in the main cable tray system passed through the floor and projected above the top of the floor.
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I File R10925-1 Page 11 Issued: 4-10-84 Three fire resistant cables without stainless steel sheaths j were installed in each of the three nominal 3 in. diameter The west conduit system
- conduit systems, as shown in ILL. 4.
- contained three 2/C-No. 14 AWG S.T.P. cables (Product i Code E30-0209). The center conduit contained two 3/C-No. 14 AWG cables and one 3/C-No. 6 AWG cable (Product Code E30-0208 and
-0204, respectively). The east conduit contained two 3/C-No. 6 AWG cables and one 3/C-No. 14 AWG cable (Product 2 Code E30-0204 and -0208, respectively). Each. cable was installed along the entire length of each conduit system and projected approximately 2 ft beyond each end of each conduit system. After installation of the cables, the ends of each conduit on the unexposed side of the assembly were stuffed with pieces of ceramic fiber blanket to minimize convective heat loss and smoke issuing from the conduit during the fire test.
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i Page 12 Issued: 4-10-84 -
} ~ File R10925-1 One-fire: resistant cable was' installed in each-of the two nominal 3/4 in. diameter rigid steel conduits and in the nominal 1-1/2 in. diameter rigid steel conduit, as shown in ILL. 5. The j- fire' resistant cable installed in the nominal 1-1/2.in. diameter
- rigid steel conduit was a 3/C-No. 6 AWG stainless steel sheathed cable (Product Code E30-0210) . The fire resistant cable p installed in.the west nominal 3/4 in. diameter rigid steel l conduit.was a 3/C-No. 14 AWG stainless steel sheathed cable j (Product Code E30-0211) . The' fire resistant cable installed in the
- east nominal 3/4 in. diameter rigid steel conduit was a i 2/C-No. 14 AWG-S.T.P. stainless steel sheathed cable (Product
) Code E30-0212) . The portion of each fire resistant cable which entered the rigid steel conduit was stripped of its stainless j steel sheath.- The stainless steel sheathed portion of each fire s resistant cable protruding from the rigid steel conduit extended through the air and entered the main cable tray system as shown in'ILL. 1. At its entrance into the main cable tray system, each fire resistant cable was secured to the top layer of fuel loading ,
cables using stainless steel cable strap . The fire resistant cables extended through the floor and projected above the top !
surface of the floor, with the ends of the cable secured to the rungs of the main cable tray system with stainless steel cable straps. The conduit-to-cable tray transitions were accomplished using compression-type conduit terminations. For each transition, the conduit termination compression shell was threaded into the conduit coupling at the end of the conduit-elbow. The fire resistant cable, with stainless steel' sheath removed and with the conduit termination coupling nut and grommet in place, was inserted into-the conduit through the opening in the compression shell. The cut end of the stainless steel sheath projected approximately 7/8 in. into the open end of the compression shell. The small and of the brassWhile grommet was flush restraining with the end of the stainless steel sheath.
the compression shell from rotating, the coupling nut was brought forward and tightened onto the compression shell to 150 ft-lb.
The unsheathed portion of each fire resistant cable extended approximately 2 ft beyond the ends of the conduits on the unexposed side of the assembly. After installation of the fire resistant cables, the end of each conduit on the unexposed side of the assembly was stuf fed with pieces of ceramic fiber blanket
-to minimize convective heat loss and smoke issuing from the conduit during the fire test.
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- File R10925-1 Page 13
} Issued: 4-10-84 i
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i the nominal' 6 in, wide slots in the floor assembly contai 1
!- n ng the vertical ~as concrete legs of the various a firestop. systems were filled with vermiculite First, 4
. exiting the floor from the main cable tray systemeach of the fire resistant cables
! ends at north end of assembly and six cable ends assembly) (three cable end of at south 4 in, wide piece of ceramic fiber blanket.were individually thick bywrapped with i
) blanket was secured in place with steel wire ties and wasThe ceramic fiber installed such that the bottom edge of the ceramic fiber bla k wrap was flush with the bottom surface of the floor. n et
' forms were placed beneath each slot, Removeable the floor slab. Small pieces of ceramic fiber blanket wereflush with the unde !
i stuffed between leakage of the vermiculite the edges of the forms and the cables to minimize concrete.
each slot to act as reinforcement. nominal 1/2'in. diameter deformed !
The vermiculite concrete, !
composed Portland cement, of five parts expanded vermiculite aggregate to one part by bulk volume, and mixed with water, was pumped into the slots and struck with a trowel.
the forms were removed from the underside of the assemblyAfter drying f .
horizontal
.the floor assembly and were verticalprotected.members of the trapeze support e
1/2 in. diameter threaded steel rods acting as the verticalThe protection on the members of the trapeze _ supports were each wrapped with a' nominal 1 in. ties.
wire thickness of ceramic fiber blanket held in place with st eel The ceramic fiber blanket was then wrapped with a layer of expanded protection material. steel lath to act as a mechanical key for the The protection material ap expanded steel lath consisted of a nominal 1 in. plied to the water and applied by hand.Zonolite Type MK-5thickness of cementitious mixture which thick structural steel angles forming the horizontal member'The protection the trapeze support consisted of a nominal 1/2 in of of the steel angle.the Type MK-5 cementitious mixture applied . thickness of aces to all exposed assembly consisted of a nominal 3/4 to 1 in. thickness ofThe protectio spray-applied Type MK-5 cementitious mixture.
endurance test is shown in ILLS.The appearance of the exposed surface b 6, 7 and 8.
the unexposed ILL. 9. surface before'the fire endurance test is showThe n in appearance of O
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File R10925-1 Page 14 Issued: 4-10-84 R
I SMALL-SCALE TEST ASSEMBLY The small-scale floor fire test assembly was constructed'in accordance with the methods specified by the.submittor, as shown ,
in ILL. 20. The construction of the test assembly was observed
. by members of the technical and engineering staff of Underwriters j Laboratories Inc.
Nominal 25 ft lengths of the 3/C-No. 14 AWG and 2/C-No. 14 AWG S.T.P. stainless steel sheathed cables (Product Code E30-0211 and -0212, respectively) were each formed into a
> coil having an outside diameter of approximately 28 in. and containing three coils of cable. Each coil was formed and held in position with four stainless steel cable straps, as shown in ILL. 20.
Four nominal 1 in. diameter holes were drilled in the j nominal 2 in. thick concrete slab to accommodate the four ends of
. the two cable coils. -The free ends of the cable coils were f inserted in1the holes as shown in ILL. 20. Two nominal 3/8 in.
diameter holes were drilled in the nominal 2 in, thick concrete slab and a No. 8 SWG (0.162 in. - diameter) galvanized steel wire was threaded through the holes and through the two coils of cable with the two ends of the wire twisted together on the top (unexposed) side of the concrete slab to suspend the coiled cables. The four cable ends were additionally supported on the top side of the floor by meansLof short lengths of steel channel in conjunction with steel wire ties. Each of the six holes in the concrete slab was stuffed with small pieces of ceramic fiber blanket.
The end of each cable projected approximately 30 in, above the top surface of the floor.
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File R10925-1 Page 15 Issued: 4-10-84 l TEST RECCRD N O. 1 EEEE SEEEEEEE 1
IUhh"EEEhE FIRE ENDURANCE TEST: J The fire endurance test was conducted with the. furnace ]
temperatures controlled in accordance with the Standard for Fire i Tests of Building Construction and Materials, ASTM E119 (UL 263, I NFPA No. 251).
SAMPLE The fire endurance test was conducted on the full-scale test assembly constructed as previously described in this Report under the section entitled " Erection Of Test Assemblies" and as shown in ILLS. 1 through 9.
The installation of the cable raceways, conduits, fire resistant cables and fuel loading cables was completed approximately seven days before the. fire endurance test was conducted.
METHOD The' standard equipment of Underwriters Laboratories Inc. for testing floor assemblies was used for the fire endurance test. l
. The temperatures of the furnace chamber were measured by 16 thermocouples which were placed 12 in, from the underside of the floor assembly, located as shown in ILL. 10. I O
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f File R10925-1 Page 16 Issued: 4-10-84
- Each conductor of the nine fire resistant cable l
configurations was energized with a low ~ voltage ac electrical current and monitored during the fire endurance test. The i electrical current driving and metering plan for each fire i
resistant cable is shown in ILL. 11. Each conductor of the three conductor power cables (Product, Code E30-0204, -0208, -0210 and
-0211) was provided with a jumper between its two ends which was fitted with a driver transformer. set and a metering transformer, as shown in ILLS. 12 and 13. The characteristics of the driver transformer circuit and its associated variable transformer were such that all conductors of each three conductor cable had a-common driver transformer set controlled by a single variable l transformer, as shown in ILLS. 15 and 16. The control range was such that currents in the range of 3 to 21 A could be achieved on the 3/C-No. 14 AWG cables and 20 to 120 A could be achieved on the 3/C-No. 6 AWG cables. The 2/C-No. 14 AWG S.T.P.
instrumentation cables (Product Code E30-0209 and -0212) were ,
similarly connected. However, the conductors of all of the two conductor cables were driven by a common transformer (three test '
sample cables plus one engineering sample cable for a total of ;
eight conductors), as shown'in ILLS. 14, 15 and 16.
The predetermined steady-state and inrush current values for-the 3/C-No. 14 AWG power cables were 3.4A and 21A,'respectively.
The predetermined steady-state and inrush current values for the 3/C-No. 6 AWG power cables were 19.8A and 120A, respectively.
The 2/C-No. 14 AWG S.T.P. instrumentation cables were each energized with a simulated " pilot" current in the approximate range of 1 to 2 A.
Before the start of the fire endurance test, each cable was energized at its predetermined steady-state current. As the fire endurance test proceeded, the output of the variable transformer was increased to maintain the steady-state currents as compensation for the increase in circuit resistance caused by the normal resistance versus temperature characteristics of the conductor exposed to the fire. During the last 15 min of the fire portion of the test, each three conductor power cable was deenergized for 10 s. After 10 s, the current was reapplied and l rapidly adjusted to an inrush value. The inrush current was held ,
for.30 s and.then rapidly decreased to the predetermined steady-state value.
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File R10925-1 Page 17 Issued: 4-10-84 l
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In addition to the low voltage ac electrical current applied to each conductor of the nine fire resistant cable configurations, each fire-resistant cable was energized with a !
de voltage and monitored continuously for electrical faults !
(conductor-to-conductor, conductor-to-sheath / ground, )
conductor-to-shield and shield-to-sheath / ground). The details of ,
the electrical fault monitor circuitry are shown schematically in l ILL. 17. The electrical fault monitor panel was connected to an automatic data logger which scanned each circuit and provided a printed record to show electrical faults.
1 Throughout the fire test, observations were made of the ;
i character of the fire and its control, the conditions of the j l exposed and unexposed surfaces, and all developments pertaining l
- i. to the performance of the fire resistant cables with special i reference to circuit integrity.
I '
i RESULTS
}
j Character And Distribution Of Fire - The fire was luminous f i and well-distributed. As shown in ILL. 10, the furnace j temperatures followed the standard time-temperature curve as j outlined in the Standard, ASTM E119 (UL 263, NFPA No. 251) during
- the first 10 min of fire exposure. Thereafter, the heat contributed from the burning fuel loading cables in the main cable tray system and the auxiliary cable tray caused the furnace j temperatures to exceed the standard time-temperature curve.
j Observations During Test - On the exposed side of the test assembly, the fuel loading cables in the auxiliary cable tray I
ignited at 40 s. The fuel loading cables in the main cable tray
{ system were smoking at 1 min, 30 s and, at 2 min, 15 s, the j cables ignited. By 3 min, 30 s, the fuel loading cables in the
- main cable trhy system and auxiliary cable tray were engulfed in i flame and were smoking profusely. The profuse flaming and smoking of the fuel loading cables continued throughout the fire exposure test. At 40 min, it was noted that the galvanized coating on the cable trays and conduits was oxidized. During the final 20 min of fire exposure, the cable tray siderails bowed
inward and several of the cable tray rungs disengaged from the '
cable tray siderails and allowed the fuel loading cables to deflect downward, i on the unexposed side of the test assembly, white smoke commenced issuing from the ends of the fire resistant cables at 4 min. The smoking continued until 30 min. Thereafter, no significant changes occurred on the unexposed side of the test assembly. The furnace fire was extinguished at 60 min.
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File R10925-1 Page 18 Issued: 4-10-84 Circuit Integrity - During the fire exposure test, each conductor of each fire resistant cable carried its steady-state electrical current. During the fire exposure, it was necessary to " trim" the variable transformer to maintain the test current.
Commencing:at 47 min, each three conductor power cable was deenergized for 10 s. The current was then reapplied to each cable and rapidly adjusted to the maximum current attainable and _
held for 30 s. The voltage output from the variable transformer was not sufficient to attain the predetermined inrush current level.in any of the power cables due to the increased resistance of the conductors. After the 30 s inrush current test, the ,
current was reduced to its steady-state value. The electrical current measurements recorded during the fire endurance test are contained in Appendix A. .
During the fire endurance test, some of the light emitting diodes (LED's) in the electrical fault monitor panel commenced 1 glowing visibly after 12 min of fire exposure. By 25 min, all of the LED's were illuminated at various degrees of brightness.
However, at that time, no electrical faults were indicated by the automatic data logger monitoring current flow through the LED's.
As the test progressed, the brightness of the-LED's increased and the current flow through the LED's registered on the automatic I data logger. l Following the fire endurance test, the electrical fault monitoring circuitry was analyzed. Based on this analysis described in the section of this Test Record entitled
" Discussion," it'was determined that no electrical faults occurred in any of the nine fire resistant cable configurations ,
during the fire endurance test. Rather, it was determined that l the illumination of-the LED's during the fire endurance test was !
an indication of leakage currents caused by the temperature l effect on insulation resistance.
INITIAL HOSE STREAM TEST:
4 SAMPLE The hose stream was applied to the exposed surface of the floor assembly. The hose stream test commenced approximately 5 min, 30 s after the furnace fire was extinguished.
METHOD At the conclusion of the fire exposure, the fire resistant cables were deenergized and the test assembly was lifted from the i furnace and moved to the hose stream area.
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File R10925-1 Page 19 Issued: 4-10-84 i
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- The cable trays, conduits and cables were subjected to the action of a water hose stream applied for a duration of 90 s. 1 The hose stream was applied with an electrically-safe fog nozzle (set at a 30' included angle) at a perpendicular distance of approximately 17 ft, 3 in. from the center of the test assembly and on a line approximately 27* from a line normal to the center of the assembly. The water pressure measured at the inlet of the 1-1/2 in. diameter hose 50 ft upstream of the nozzle was 105 psi.
Following the 90 s water hose stream test, subsequent applications of water were necessary to suppress flaming of the fuel loading cables in the main cable tray system and in the auxiliary cable tray.
RESULTS l Upon suppression of all flaming of the fuel loading cables, current was applied to each of the nine fire resistant cable configurations. Each conductor of each fire resistant cable carried its steady-state electrical current.
At the conclusion of the fire endurance test, all of the electrical fault monitoring circuits had been switched off.
Following the water hose stream test, all of the electrical fault l I
monitoring circuits were reenergized. At that time, a low current (1 mA) electrical fault (dim LED) was indicated between the shield and sheath of the 2/C-No. 14 AWG S.T.P.
instrumentation cable with stair.less steel sheath in the main l cable tray system. No other electrical faults were indicated.
EXTENDED COOL-DOWN PERIOD: .
At the conclusion of the fire endurance test and initial water hose stream test, the predetermined. steady-state electrical currents were reapplied to each of the nine fire resistant cable configurations. The cables remained energized throughout a 93 h extended cool-down period except for 10 s periods immediately preceding each of four supplemental inrush current tests. The electrical current measurements recorded during the extended cool-down period are contained in Appendix A.
4
File R10925-1 Page 20 Issued: 4-10-84 In addition to monitoring current in each of the nine fire resistant cable configurations, each fire resistant cable was energized with a de voltage and monitored for electrical faults during the 93 h extended cool-down period. To monitor circuit integrity in the absence of an operator (at night) , the electrical fault monitor panel was connected to an automatic data logger which scanned each circuit at 55 min intervals and provided a printed record to show electrical faults. No electrical faults occurred during the extended cool-down period.
SECOND HOSE STREAM TEST:
SAMPLE The hose stream was applied to the exposed surface of the floor assembly. The hose stream test commenced approximately 93 h after the fire endurance test was completed.
METHOD At the conclusion of the 93 h extended cool-down period, the fire resistant cables were deenergized (except for de voltage used to monitor cables for electrical faults) and the cable trays, conduits and cables were subjected to the action of a water hose stream applied for a duration of 90 s. The hose stream was applied with an electrically-safe fog nozzle (set at a 30' included angle) at a maximum distance of 5 ft from each of the cable trays, conduits and cables. The water pressure measured at the inlet of the 1-1/2 in. diameter hose 50 ft upstream of the nozzle was 100 psi.
RESULTS During the hose stream test, no electrical faults occurred in the fire resistant cables.
Upon completion of the hose stream test, current was applied to each of the nine fire resistant cable configurations. Each conductor of each fire resistant cable carried its steady-state ,
electrical current, A final inrush current test was conducted approximately 3 min after the hose stream test was completed.
The electrical current measurements recorded during the final inrush current test are contained in Appendix A.
OBSERVATIONS AFTER TESTS:
The appearance of the exposed surface of the test assembly -
after all testing was completed is shown in ILLS. 18 and 19. l
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{ File R10925-1 Page 21 Issued: 4-10-84
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! Ron the exposed side of the assembly, the three nominal 3 in.
diameter rigid steel conduit systems and the three conduits used
! for the conduit-to-cable tray transitions were. oxidized but were j otherwise unchanged.
4 i The main cable tray system and auxiliary cable tray were
! essentially destroyed. A majority of the cable tray rungs were a disengaged from the cable tray siderails at one or both ends such
! that the mass of fuel loading cables was supported by the trapeze j supports and by the fire resistant cables which penetrated the ;
j, floor assembly at the two ends of the main cable tray system. l Approximately 80 percent of the insulation and jacketing i materials on the fuel loading cables had been consumed during the j fire endurance test.
f i The stainless steel sheathed fire resistant cables in the
- main cable tray system and in the conduit-to-cable tray
{ transition were displaced due to the disengagement of the cable i
3 tray rungs and the resultant downward movement of the fuel
! loading cable mass. With the loss of support from,the cable tray rungs,.the fuel loading cable mass along most of the main cable i tray system run was. suspended from the stainless steel sheathed fire resistant cables. The stainless steel sheath on each of the
! fire resistant cables did not appear to be damaged by the applied i stresses.
I
- .The cementitious mixture protection material on the underside of the floor assembly and on'the trapeze supports was l
- partially dislodged by the water hose stream tests. Beneath the
- . protection material, the floor assembly and trapeze supports l
- remained structurally sound. l l
l Other than discoloration of the fire resistant cable ends J
! and the vertical legs of the cable raceways, no changes were
- noted in the appearance of the unexposed surface of the test ,
i assembly. l DISCUSSION:
! During the fire endurance test, some of the light emitting
} diodes (LED's) in the electrical fault monitoring panel commenced l glowing visibly after 12 min of fire exposure. By 25 min, all of j the LED's were illuminated at various degrees of brightness.
j However, at that time, no electrical faults were indicated by the
- automatic data logger which monitored current flow through the i LED's. As the test progressed, the brightness of the LED's
- increased and the current flow through the LED's became sufficiently high to register on the automatic data logger.
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File R10925-1 Page 22 Issued: 4-10-84 Following the fire endurance test and the initial water hose stream test, the only electrical fault indicated on the electrical fault' monitoring panel was a dim glow of the. LED's l associated with the shield and sheath of the 2/C-No. 14 AWG l S.T.P. instrumentation cable in the main cable tray system. The l current flow through the two LED's was not sufficient to register );
on the automatic data logger.
During the extended cool-down period, the electrical fault monitoring circuitry was analyzed to discern the cause of the l anomalous electrical fault indications during the fire endurance test.
The electrical fault monitoring circuitry is depicted schematically in ILL. 17. As shown, a dc voltage of 120 V is connected to a voltage divider. Two LED's are connected to the l voltage divider at multiple points. The forward diode is yellow ;
and the reverse diode is red. The outboard end of the diodes is l connected to the test points (i.e., conductor, shield, sheath and/or ground). When an ohmic path is established between any two test points, the associated current flows between the LED's to indicate the nature of the electrical fault. Dependent upon the orientation of the LED's along the voltage divider, the level ,
of current flowing between the LED's associated with two test j points ranges between 17 and 104 mA under electrical fault ;
conditions. l The automatic data logger monitoring current flow through the LED's was configured to indicate O percent up to 4 mA, 100 percent at 20 mA and "overrange" at anything over 20 mA in the forward direction. Over 20 mA in the reverse direction would also indicate an "overrange" condition.
' Based on technical information provided by the manufacturer of the LED's used in the electrical fault monitoring panel, it was thought that a de current in the range of 16 to 45 mA was required to illuminate the LED's. However, it was found that a de current of 0.1 mA was sufficient to cause a visible glow in the LED's.
File R10925-1 Page 23 Issued: 4-10-84 l
Based on the above in conjunction with a review of the printed record of current flow through the LED's during the fire -<
endurance test, it was determined that no electrical faults i occurred in any of the nine fire resistant cable configurations.
Rather, the illumination of the LED's during the fire endurance test was determined to be an indication of leakage currents caused by the tamperature effect on insulation resistance. Since the decrease in insulation resistance with. temperature is reversible, no illumination of the LED's occurred after the assembly had been cooled by the water hose stream test. The only exception was the LED's associated with the shield and sheath of the 2/C-No. 14 AWG S.T.P. instrumentation cable in the main cable ,
tray system. J As indicated earlier in this discussion, the LED's associated with the shield and sheath of the 2/C-No. 14 AWG S.T.P. instrumentation cable in the main cable tray system continued to glow visibly following the initial water hose stream test. Approximately 24 h after the fire endurance test was completed, the current flow through the LED's was measured with a Simpson Model 260 Volt-Ohm-Milliammeter and was found to be 1 mA.
Approximately 72 h after the fire endurance test had been completed, the illumination of the LED's was still perceptible but was very. faint. The measured' current flow through the LED's at that time was 0.1 mA.
The level of current flowing between the LED's associated with the shield and sheath of the 2/C-No. 14 AWG S.T.P.
instrumentation cable in the main cable tray system under
- mechanically induced electrical fault conditions was in excess of 20 mA. However, the measured current flow through the LED's in question was only 1 mA. Upon further cooling and drying of the l assembly, the measured current flow through the LED's in question !
had dropped to.0.1 mA. These observations tend to substantiate ;
the determination that no electrical faults occurred in the 2/C-No. 14 AWG S.T.P. instrumentation cabic and that the illumination of the LED's in question reflected leakage current !
between the shield and sheath. 1 i
To further substantiate the determination that no' electrical i faults were present in the nine fire resistant cable configurations,. insulation resistance and dielectric voltage-withstand tests wera conducted on each conductor of the 7.'.ne cables. The results of the insulation resistance and dielectric voltage-withstand tests are contained in Appendices B
- and C, respectively, i i i
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-- ..,--,y, ,y, . - , , , , --4m -. v--- c - -- m - , y ,-- , ,,- --
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Because of the scale'of the test assembly and s&fety considerations involved, it was deemed inadvisable to conduct the ,
full-scale fire test investigation with the cables energized at i rated voltage. -Instead, the cables.were energized only at rated !
current with a supplemental low voltage de electrical fault '
monitoring circuit. In order to determine the levels of leakage '
current present in the fire resistant cables under fire exposure conditions with the cables energized at rated voltage, a second fire test investigation was conducted,'as described.in Test ~
Record No. 2. ;
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l TEST RECORD N O. 2 i
EEbhk"EEbhE EEEE bEEEEEhE FIRE ENDURANCE TEST:
5 The fire endurance test was conducted with the furnace i temperatures controlled in accordance with the Standard for Fire i Tests Of Building Construction And Materials, ASTM E119 (UL 26 3,
! NFPA No. 251).
! SAMPLE I
The fire endurance test was conducted on the small-scale ,
j test assembly constructed as described previously in this Report l under the section entitled " Erection Of Test Assemblies" and as l 1
shown in ILL. 20. i
! The installation of the fire resistant cables in the l
! concrete floor slab was completed approximately 18 h before the l fire test was conducted. The humidity of th- :oncrete slab was 1 l less than 75 percent at the time of the fire < ut.
i METHOD l
i i The assembly was tested on a horizontal exposure furnace, as
! shown in ILL. 21. The furnace temperatures were measured by
- three thermocouples symmetrically located 12 in'. below the i exposed surface of the floor slab.
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4 The temperatures of each coil c 2 fire resistant cable were i measured by two thermocouples affixed to the stainless steel sheath with' stainless steel cable straps and located as shown in Appendix D, ILL. Dl.
The fire resistant cables were connected to a test panel and three-phase power supply as shown in ILLS. 22, 23 and 24. The power supply was adjusted to provide three-phase Y voltages of 400/277 V ac. At room temperature (approximately 70 'F) the Since circuit was energized and charging currents were measured.
only one test' panel was available, the 3/C-No. 14 AWG power cable l was energized continuously throughout the fire endurance test except for brief periods when it was disconnected to make i measurements on the 2/C-No. 14 AWG S.T.P. instrumentation cable.
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File R10925-1 Page 26 Issued: 4-10-84 Throughout the fire test, observations were made of the character of the fire and its control, the conditions of the exposed and unexposed surfaces, and all developments pertaining to the performance of the fire resistant cables.
RESULTS Character And Distribution Of Fire - The fire was luminous and well distributed, and the furnace temperatures followed the standard time-temperature curve as outlined in the Standard, ASTM E119 (UL 263, NFPA No. 251) , and as shown in the following table:
Test Temperature, *F Average Time, (ASTM E119 Time- Furnace min Temperature Curve) Temperature, 'F 1 285 400 2 500 645 3 670 725 4 860 760 5 1000 1000 6 1110 1145 7 1180 1180 8 1230 1240 9 1260 1270 10 1300 1300 15 1399 1400 20 1462 1445 25 1510 1500' 30 1550 1550 35 1584 1580 40 1613 1620 45 1638 1640 50 1661 1670 55 1681 1690 60 1700 1700 65 1718 1710 70 1735 1735 75 1750 1750 78 1759 1760 8
Page 27 Issued: 4-10-84 File R10925-1 Observations During Test - On the exposed side of the test assembly, no changes were noted in the appearance of the fire resistant cables other than discoloration of the stainless steel sheaths.
On the unexposed side of the test assembly, white smoke commenced issuing from the ends of the fire resistant cables at 3 min. The smoking continued until 30 min. Other than ;
I discoloration of the cable ends and a slight " dishing" of the concrete floor slab, no significant changes were noted in the l l
appearance of the unexposed surface during the remainder of the fire test. The furnace fire was extinguished at 78 min.
Temperatures Of The Cables - The temperatures measured by the various thermocouples on the fire resistant cables were measured at 1 min intervals during the fire test. These ILLS. D2, D3 and D4.
temperatures are tabulated in Appendix D, Leakage Current Measurements - During the fire endurance test and after the fire endurancJ test was completed, the leakage currents in each fire resistant The cable were voltages applied measured andwhile leakage energized at rated voltage.
currents were measured using four Beckman 3010 Digital Multimeters supplied by The Rockbestos Company. After 1 h of fire exposure, each cable was subjected to an overvoltage condition (960 V ac phase-to-phase) for a minimum of 2 min The and supplemental leakage current measurements were obtained. -
leakage current measurements recorded during the fire test investigation are shown in the following tables:
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LEAKACE CURRENT MEASUREMENTS (Applied Voltage - 480 V ac 3-Phase Y, 277 V ac - Ground) i 3/C - No. 14 AWC Power Cable W/ Stainless Steel $ heath (E30-0211)
Leakage Current. Phase-Cround Leakage Current. Phase-Delta Test Time Avg. Furnace Temp., 'F Red Cndr. White Cnde. Black Cndr Red Cndr. White Cnde. Black Cndr.
sin 70
- 72.6uA 74.9uA 74.9uA 94.6uA 97.4uA 97.7uA 0
- - - 150uA 152uA 158uA 6 1145 0.19mA 0.21mA 1.5mA 0.19mA 0.25mA 0.5mA 12 1345 0.34mA 0.35mA 0.45mA 18 1430 0.43mA 0.45mA 0.46mA 0.44mA 0.45mA 0.47mA 20 1445 1.0thA 1.09mA 1.11mA 0.99mA 1.04mA 1.07mA 31 1555 7.16mA 7.45mA 5.49mA 6.91mA 7.13mA 5.30mA 40 1620 13.8mA 13.0mA 10.2mA 12.8mA 12.8mA 9.69mA ,
47 1660 23.7mA 18.3mA 23.9mA 23.4mA 18.0mA 54 1680 24.2mA 42.3mA 32.9mA 42.1mA 41.4mA 32.4mA 63 1705 42.7mA 114uA 64uA 114uA 125uA 73uA 97+ 650 110uA
~ 2/C - No. 14 AWC S.T.P. Instrumentation Cable W/ Stainless Steel Sheath (E30-0212) !
Test Time, Avg. Furnace Leakaoe Current. Cndr. - Shield Leakage Current. Cnde. - Cndr.
ein Temp., 'F White Conductor Black Conductor White Conductor Black Conductor 95.1uA 110uA 110uA 0 70 97.6uA 0.96mA 0.84mA 0.92mA 0.83mA 26 1505 3.65mA 4.06mA 3.58mA 35 1580 4.21mA 21.3mA 22.9mA 21.0mA l 49 1670 23.2mA 59.6mA 60.4mA 59.1mA l 65 1710 60.9mA 103uA - 112uA 112uA l 103+ 600 100uA l
j
+ - Furnace fire extinguished at 78 min. Leakage current measurements taken with test sample located in furnace. l SUPPLEMENTAL LEAKACE CURRENT MEASUREMENTS
( Applied Voltage - 960 V ac 3-Phase Y, 555 V ac - Cround)++
3/C - No.14 AWC Power Cable W/ Stainless Steel Sheath (E30-0211)
Leakage Current. Phase-Cround Leakage Current Phase-Delta Test Time, Avg. Furnace min Temp., 'F Red Cnde. White Cadr. Black Cndr. Red Cndr. White Cndr. Black Cndr.
99mA 100mA 110mA 84mA 68 1725 127mA 138mA
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4 2/C - No.14 AWC 5.T.P. Instrumentation Cable W/ Stainless Steel Sheath (E30-0212) 3 Test Time, Avg. Furnace Leakage Current. Cnde. - Shield Leakage Current. Cndr. - Cndr.
3 4 min Temp 'F White Conductor Black Conductor White Conductor Black Conductor d'
1750 163mA 162mA 138mA 138mA
) 75 j- ++ - High voltage applied and held for minimum 2 min for each lea 6 age current measurement.
i As a supplement to the above, the leakage current between
- the shield and.the sheath of the 2/C-No. 14 AMG S.T.P.
instrumentation cable was measured after approximately 75 min of fire exposure. With an applied voltage of 10 7.ac, the leakage l
l current was 113 mA. With an applied voltage of 180 V ac, the i leakage current was 2000 mA.
i In addition, the insulation resistance between the shield and sheath of the 2/C-No. 14 AWG S.T.P. instrumentation cable was j- measured during and after the fire endurance test. The insulation resistance measurements recorded during the fire test
- ' investigation are shown in the following table
Shield-Sheath Test Time, Average Furnace l;
min Temperature, 'F Insulation Resistance
! 27 1525 17 kilohms
! 56 1695 2.1 kilohms 75 1750 3.5 kilohms l 100 kilohms
- 103 600 i
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l SyggAR1 In consideration of the nature of this investigation, the ,
foregoing Report is to be construed as information only and l should not be regarded as conveying any conclusions or recommendations on the part of Underwriters Laboratories Inc.
regarding the acceptability of the fire resistant cables for use in redundant safety trains, as specified in Appendix R to 10 CFR 50, or for any other purpose.
A total of six fire resistant. cable types were installed in a total of nine configurations beneath a full-scale floor assembly. The nine fire resistant cable configurations are listed below:
- 1. 3/C-No. 14 AWG power cable with stainless steel sheath (Product Code E30-0211) in conduit-to-cable tr'ay transition.
- 2. 3/C-No. 14 AWG power cable with stainless steel sheath (Product' Code E30-0211) in cable tray.
- 3. 3/C-No. 14 AWG power cable without stainless steel sheath (Product Code E30-0208) in conduit.
- 4. 3/C-No. 6 AWG power cable with stainless steel sheath ,
(Product Code E30-0210) in conduit-to-cable tray transition. i
- 5. 3/C-No. 6 AWG power cable with stainless steel sheath (Product Code E30-0210) in cable tray. !
3/C-No. 6 AWG power cable without stainless steel )
6.
sheath (Product Code E30-0204) in conduit.
- 7. 2/C-No. 14 AWG shielded twisted pair (S.T.P.)
instrumentation cable with stainless steel sheath (Product Code E30-0212) in conduit-to-cable tray transition.
- 8. 2/C-No. 14 AWG S.T.P. instrumentation cable with stainless steel sheath (Product Code E30-0212) in cable tray.
- 9. 2/C-No. 14 AWG S.T.P. instrumentation cable without stainless steel sheath (Product Code E30-0209) in conduit.
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i File R10925-1 Page 31 Issued: 4-10-84 I
On February 21, 1984, the full-scale floor assembly containing the nine fire resistant cable configurations was subjected to a 1 h fire endurance test. The fire endurance test was conducted with the furnace temperatures controlled in accordance with the standard time-temperature curve specified in ASTM Standard E119 (UL 263, NFPA No. 251). During the fire endurance test, each of the fire resistant cables was energized with a steady-state electrical current. Commencing after 47 min of fire exposure, each cable was-deenergized'for 10 s and an inrush current was applied to each cable and held for 30 s.
After the 30 s inrush, the current levels were-reduced to the steady-state values.
Immediately following the 1 h fire endurance test, the fire !
resistant cables were deenergized, the test assembly was removed !
from the furnace and the underside of the test assembly was l subjected to the impact, erosion and cooling effect of a water i hose stream applied for a duration of 90 s. Following additional water application to suppress flaming of the fuel loading cables in the cable tray systems, the fire resistant cables were again I energized with steady-state electrical currents for an extended ;
cool-down period totaling 93 h.
During the: initial 79_h of the extended cool-down period, inrush current levels were applied to the test cables four times. ,
Following the 79 h extended cool-down period, the cables remained energized with their steady-state electrical currents for an additional 14 h, after which they were deenergized and subjected ,
to a second water hose stream test. Following the second water hose stream test, the cables were reenergized and a final inrush current test was conducted.
The electrical current measurements recorded during the full-scale test investigation are contained in Appendix A.
The insulation resistance of each fire resistant cable conductor was measured before the fire test, 24 h after the fire test and approximately 96 h after the fire test immediately following the second water hose stream. The insulation resistance measurements are contained in hppendix B.
On March 9, 1984'(17 days after-the full-scale fire test),
test potentials were applied to each fire resistant cable to determine " trip" voltage and voltage withstand between each conductor'and all other conductors plus the shield, sheath or ground. The " trip" voltage and sustained voltage measurements are contained in Appendix C.
, - + - - - - , . - - . - -
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! File R10925-1 Page 32 Issued: 4-10-84 As evidenced from the tables in Appendices A, B and C, each
- of the nine_ fire resistant cable configurations in the full-scale
- test assembly remained electrically functional during the fire i endurance test and during the extended cool-down period.
1 j During the fire endurance test of the full-scale test
- assembly, all of the light emitting diodes (LED's) in the electrical fault monitoring panel illuminated. Based upon an i analysis of the electrical fault monitoring circuitry and a
- review of the recorded data, it was determined that no electrical faults occurred in the nine fire resistant cable configurations l .
i and that'the illumination of the LED's during the fire-endurance
! test was an indication of leakage current caused by the temperature effect on insulation. resistance. To determine the levels _of leakage current present in the fire resistant cables.
- during fire exposure conditions, a second fire endurance test was j conducted on nominal 20 ft lengths of the stainless steel
- sheathed 3/C-No. 14 AWG power cable f (Product Code E30-0211) and
- the stainless. steel sheathed 2/C-No. 14 AWG shielded twisted pair (S.T. P. ) instrumentation cable' (Product Code E30-0212) installed
! beneat,h a small-scale floor assembly.
j On March 9, 1984, the small-scale floor assembly was subjected to a 78 min fire exposure with the furnace temperatures j controlled in accordance with the ASTM Standard E119 (UL 263, l NFPA No. 251). During the fire endurance test, the cables were connected to a three phase power supply adjusted to. provide three phase Y voltages of 480/277 V and 960/555 V ac. The leakage l
current measurements recorded during the small-scale test investigation are contained in Test Record No. 2. The temperatures measured on the stainless steel sheath of each fire resistant cable during the small-scale test investigation are '
- contained in Appendix D.
The calibration records of the instrumentation used in the investigation are contained in Appendix E.
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File R10925-1 Page 33 Issued: 4-10-84 J l Report by: Reviewed by:
C C. . JOHNSON h
R. M. BERHINIG Engineering Associate Engineering Grou Leader Fire Protection Department Fire Protection Department i W K. W. HOWELL Associate Managing Engineer Fire Protection Department
& ?
J. R. BEYREIS Managing Enginear Fire Protection Department CJJ/RMB:pr RPTS3 i
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SEEEEEEE S a
EkEEEEEEbh EEEEEEl EEbEEEEEEE1E i
EEkk-EShkE ZEE 2 h2E&MEhX '
. The electrical current in each cable circuit was measured i
2 using a General Electric Model 750X93G metering transformer in
. conjunction with a General Electric Model 25034 panel ammeter i j having a range of 0-5 A ac. The stepdown ratios of the metering
, transformers were calibrated to obtain .the required current (s) as a percentage of full scale deflection of the panel ammeters.
The three panel ammeters associated with~each 2 three-conductor power cable'and the two panel ammeters associated l with the two-conductor shielded twisted pair (S.T. P. )
i instrumentation cables were arranged in vertical rows, as shown
- in ILL. 16. It was expected that some variation in the current
- readings would be present in the individual panel ammeters associated with each cable due to the small variations in circuit impedance inherent in applications of three phase loads.
Accordingly, the center panel ammeter associated with the white conductor of the individual three-conductor power cables was
- chosen to represent the desired current in each power cable.
4 4
- The metering transformer and panel ammeter associated with l t the white conductor (center panel ammeter) of each l l three-conductor power cable and with each group of conductors of
- _the two-conductor S.T.P. cables were calibrated against a t reference ammeter. The reference ammeter used to check the i calibration of the metering transformers and panel ammeters was
- an Amprobe Model ACD-1 hand-held clamp-on digital ammeter j supplied by The Rockbestos Company. The calibration of the '
l digital ammeter was checked against a calibrated General !
j Electric 0-800A, 0-750 V hand-held clamp-on ammeter. .l The actual electrical current associated with the panel .
. ammeter reading of each circuit at the desired test current (s) is I
shown in the following table:
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File R10925-1 Page A2 Issued: 4-10-84 CURRENT MEASUREMENT CALIBRATION Steady-State Current inrush Current l Meter Actual Meter Actual j Fire Resistant Cable Type Cable Location Reading. A Current. A Reading. A Current. A l 3/C-No. 14 AWC w/ Stainless conduit-to-Cable 0.8 4.7 4 19.9 Steel Sheath ( D 0-0211) Tray Transition 3/C-No. 14 AWC w/ Stainless Cable Tray-to-Cable 0.8 4.1 4 19.4 Steel Sheath (E30-0211) Tray Transition 3/C-No.14 AWC w/o Stain- Nos. 3 in. Ofameter 0.8 3.8 4.2 20.1 less Steel Sheath (00-0208) Conduft System 3/C-No. 6 AWC w/ Stainless Condult-to-Cable 1.0 30.0 4.0 118 Steel Sheath (D0-0210) Tray Transition 3/C-No. 6 AWC w/ Stainless Cable Tray-to-Cable 1.0 30.3 4.0 116 Steel Sheath (D 0-0210) Tray Transition
! 3/C-No. 6 AWC w/o Stainless Nom. 3 in. Ofameter 1.0 29.1 4.0 120 f Steel Sheath (0 0-0204) Conduit System 4
2/C-No.14 AWC S.T.P. All (4 White Cndes) 3.S 6.7 N.A. N.A. I l w/ & w/o Stainless Steel All (4 Black Cndrs)
Sheath (D0-0212 & -0209) 4.0 7.7 N.A. N.A.
l The steady-state electrical current in each cable circuit J
. and the inrush electrical current in each power cable circuit i were recorded at various times during the fire endurance test and
- during the extended cool-down period, as shown in the following tables. In each table, the test time (Hr
- Min) is the elapsed j time.from initiation of the fire endurance test.
During the fire endurance test and, in some instances, )
. during the extended cool-down period, the voltage output from the j i
variable transformers to their associated driver transformers was '
- not sufficient to attain the desired inrush currents due to leakage currents. In cases where the desired inrush current was
, not attainable,'the maximum attainable inrush current was applied j and held for a duration of 30 to 32 s rather than the prescribed '
i 15 s duration.
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4 i ELECTRICAL CURRENT MEASUREMENTS I Cable Type - 3/C-No.14 AWC power cable w/ stainless steel sheath (Product Code D0-0211)
I I Cable Location - Condult-to-cable tray transition.
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Test Red Conductor White Conductor Black Conductor inrush Time, Meter Actual Meter Actual Meter Actual Current a Hr: Min Readine. A Current. A Readine. A Current. A Readina. A Current. A Ouration i
- 0:00 0.9 5.3 0.8 4.7 1.0 5.9 -
Osta 0.8 4.7 0.6 3.5 0.8 4.7 -
l 0:32 0.8 4.7 0.7 4.1 0.9 5.3 -
j 0:43 0.9 5.3 0.9 5.3 0.9 5.3 -
. 0:47 3.4 16.9 3.2 15.9 3.3 16.4 30 s 0:58 1.0 5.9 0.9 5.3 0.8- 4.7 -
i 1:44 0.8 4.7 0.7 4.1 0.9 5.3 -
4.0 19.9 4.0 19.9 4.0 19.9 17 s
! 2:20 I 27:34 1.0 5.9 0.9 5.3 1.0 5.9 -
4.2 20.9 4.1 20.4 4.1 20.4 16 s 27:39
! 48:40 0.9 5.3 0.8 4.7 1.0 5.9 -
! 49:10 4.1 20.4 4.0 19.9 4.0 19.9 15 s 76:00 0.9 5.3 0.8 4.7 1.0 5.9 -
4.1 20.4 4.0 19.9 4.0 19.9 16 s-l 79:30 4.1 20.4 4.0 19.9 4.0 19.9 15 s 94:05 i
i Cable Type - 3/C-No.14 AWC power cable w/ stainless steel sheath (Product Code D0-0211)-
}.
!. Cable Location - Cable tray-to-cable tray transition.
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- Test Red Conductor White Conductor 81ack Conductor inrush-Actual Meter Actual Meter Actual Current ;
Time, Meter l
~
Hr: Min Reading. A Current. A Readina. A Current. A Readina. A Current. A Duration I
0:00 0.8 4.1 0.8 4.1 0.8 4.1 1
0.8 4.1 0.8 4.1 0.8 4.1 -
0:18 0.8 4.1 0.8 4.1 0.8 4.1 -
- 0:32 -
0.8 4.1 0.8 4.1 0.8 4.1 l 0:43 17.5 3.7 17.9 3.6 17 5 30 s
) 0:47 3.6 0:58- 0.9 4.6 0.9 4.6 0.9 4.6 -
0.9 4.6 0.9 4.6 0.9 4.6 -
1:44 4
4.0 19.4 3.9 18.9 17 s 3 2:20' 4.0 19.4 0.9 4.6 - 0.9 4.6 0.9 4.6 -
27:34 19.4 3.9 18.9 15 s l 27:39 4 '. 0 19.4 4.0 -
4.1 0.8 4.1 0.8 4.1 l- 44:40 0.8 4.0 19.4 3.9 18.9 15 s 49:10 4.0 19.4 -
4.6 0.8 4.1 0.8 4.1 76:00 0.9 4.1 19.9 4.0 19.4 21 s j 79:30 4.0 19.4_
4.0 19.4 3.9 18.9 16 s d 94:05 4.0 19.4 i
File R10925-1 Page A4 Issued: 4-10-84 Cable Type - 3/C-No.14 AWC power cable w/o stainless steel sheath (Product Code E30-0208)
Cable Location - Nominal 3 in. diameter rigid steel conduit system.
Test Red Conductor White Conductor Black Conductor inrush Time, Meter Actual Meter Actual Meter Actual Current Hr: Min Reading. A Current. A Readinc. A Current. A Readino. A Current. A Duration 0:00 0.3 3.8 0.8 3.8 0,8 3.8 -
0:18 0.7 3.3 0.7 3.3 0.7 3.3 -
0:32 0.8 3.8 0.8 3.8 0.9 4.3 -
0:43 0.8 3.8 0.8 3.8 0.9 4.3 -
0:47 3.5 16.8 3.5 16.8 3.6 17.2 30 s 0:58 0.8 3.8 0.8 3.8 0.9 4.3 -
1:44 0.9 4.3 0.9 4.3 0.9 4.3 -
2:20 4.0 19.1 4.0 19.1 4.1 19.6 20 s 27:34 0.8 3.8 0.8 3.8 0.9 4.3 -
27:39 4.0 19.1 4.0 19.1 4.1 19.6 15 s 48:40 0.8 3.8 0.8 3.8 0.9 4.3 -
Jd 49:10 4.0 19.1 4.0 19.1 4.1 19.6 15 s 76:00 0.8 3.8 0.8 3.8 0.8 3.8 -
79:30 4.0 19.1 4.0 19.1 4.1 19.6 15 s 94:05 4.0 19.1 4.0 19.1 4.1 19.6 15 s Cable Type - 3/C-No. 6 AWC power cable w/ stainless steel sheath (Product Code E30-0210)
Cable Location - Conduit-to-cable tray transition.
Test Red Conductor White Conductor Black Conductor inrush Time, Heter Actual Meter Actual Meter Actual Current Hr: Min Reading. A Current. A Reading. A Current. A Readino. A Current. A Durati on 0:00 0.8 24.0 0.8 24.0 0.8 24.0 -
0:18 0.6 18.0 0.6 18.0 0.7 21.0 -
0:32 - -
- (Not Recorded) - - -
0:43 0.8 24.0 0.8 24.0 0.9 27.0 -
0:47 2.5 73.8 2.4 70.8 2.5 73.8 30 s 0:58 0.8 24.0 0.6 18.0 0.8 24.0 -
1:44 0.9 27.0 0.9 27.0 0.9 27.0 -
2:20 3.7 109.1 3.7 109.1 3.7 1 09.1 17 s ,
27:34 0.8 24.0 0.8 24.0 0.8 24.0 -
27:39 3.8 112.1 3.8 112.1 3.8 112.1 31 s 48:40 0.8 24.0 0.7 21.0 0.8 24.0 -
49:10 3.8 112.1 3.8 112.1 3.9 115.1 30 s 76:00 0.8 24.0 0.7 21.0 0.6 24.0 -
79:30 3.8 112.1 3.8 112.1 3.9 115.1 31 s 94:05 3.8 112.1 3.9 115.1 3.9 115.1 30 s i
l
1 File R10925-1 Page AS Issued: 4-10-84 Cable Type - 3/C-No. 6 AWG power cable w/ stainless steel sheath (Product Code E30-0210)
Cable Location - Cable tray-to-cable tray transition.
Test Red Conductor White Conductor Black Conductor inrush Time, Meter Actual Meter Actual Meter Actual Current Hr: Min Readine. A Current. A Reading, A Current. A {eading. A Current. A Duration 0:00 0.8 24.2 0.8 24.2 0.8 24.2 -
0:18 0.8 24.2 0.7 21.2 0.7 21.2 -
0:32 0.7 21.2 0.7 21.2 0.7 21.2 -
0:43 0.8 24.2 0.7 21.2 0.7 21.2 -
0:47 3.1 89.9 3.0 87.0 3.0 87.0 30 s 0:58 0.9 27.3 0.9 27.3 0.9 27.3 -
1:44 0.9 27.3 0.8 24.2 0.9 27.3 -
2:20 4.0 116.0 4.0 116.0 4.0 116.0 20 s 27:34 0.9 27.3 0.6 18.2 0.7 21.2 -
27:39 4.0 116.0 4.0 116.0 4.0 116.0 15 s 48:40 0.8 24.2 0.7 21.2 0.8 24.2 -
49:10 4.0 116.0 4.0 116.0 4.0 116.0 15 s 76:00 0.8 24.2 0.7 21.2 0.7 21.2 -
79:30 4.0 116.0 4.0 116.0 4.0 116.0 15 s 94:05 4.0 116.0 4.0 116.0 4.0 116.0 15 s Cable Type - 3/C-No. 6 AWC power cable w/o stainless steel sheath (Product Code E30-0204)
Cable Location - Nominal 3 in. diameter rigid steel conduit system.
Test Red Conductor Whlte Conductor Black Conductor inrush Time, Meter Actual Meter Actual Meter Actual Current Hr: Min Readino. A Current. A Reading. A Current. A Reading. A Current. A Duration 0:00 0.8 23.4 0.8 23.4 0.8 23.4 -
0:18 0.8 23.4 0.8 23.4 0.8 23.4 -
0:32 0.8 23.4 0.8 23.4 0.8 23.4 -
0:43 0.7 20.4 0.7 20.4 0.7 20.4 -
0:47 2.9 87.0 2.9 87.0 2.9 87.0 30 s 0:58 0.9 26.2 0.9 26.2 0.9 26.2 -
1:44 0.8 23.4 0.8 23.4 0.8 23.4 -
2:20 3.1 93.0 3.1 93.0 3.1 93.0 30 s
'27:34 0.8 23.4 0.8 23.4 0.8 23.4 -
27:39- 3.2 96.0 3.2 96.0 3.2 96.0 31 s 48:40 0.7 20.4 0.7 20.4 0.7 20.4 -
49:10 3.2 96.0 3.2 96.0 3.2 96.0 30 s 76:00 0.7 20.4 0.7 20.4 0.7 20.4 -
79:30 3.2 96.0 3.2 96.0 3.2 96.0 31 s 94:05 3.2 96.0 3.2 96.0 3.3 99.0 32 s
. . . - . .. - _ _ . - . . _ . . - . . . . . - . ~ . .- - - . - . . - . - . - . . . . - , ~, . .-
l i
! File R10925-1 Page A6 Issued: 4-10-84 i
l Cable Types - 2/C-No. 14 AWG shielded twisted pair (S.T. P. )
i instrumentation cables with and without stainless steel sheath j (Product Codes E30-0212 and -0209, respectively).
Cable Locations - All.
l Test White Conductors (4) Black Conductors (4)
Time, Meter Actual Meter Actual I. Hr: Min Reading, A Current, A Reading, A Current, A
{
0:00 4.1 7.8 4.1 7.9 I 0:18 4.3 8.2 4. 3 ' 8.3
- 0:32 4.2 8.0 4.1 7.9 0:43 4.0 7.7 4.0 7.7 0:58 4.0 7.7 4.0 7.7 1 1:44 4.0 7.7 4.0 7.7 1- 27:34 4.0 7.7 4.0 7.7 j- 48:40 4.1 7.8 4.1 7.9 i 76:00 4.1 7.8 4.1 7.9 :
4 1
i t
1 0
File R10925-1 Page B1 Issued: 4-10-84 hEEEEELE E L E 2 2 h h 219 y y y s g g 15 y g g y 5 g s y g 5 g 5 y 1 s EEkk-22hkE 1gsg 5gsyyggg The insulation resistance (I.R.) of each. power cable conductor (one conductor to all others plus sheath / ground) and each shielded twisted pair (s.T.P.) instrumentation cable (conductor to conductor plus shield and shield to sheath / ground) were measured using a General Radio Model 1864 Megohmmeter and a simpson Model 260 Volt-Ohm-Milliammeter supplied by The Rockbestos Company.
The initial I.R. test was conducted approximately 18 h before the fire endurance test with the jumpers disconnected.
The interim I.R. test was conducted approximately 24 h after completion of the fire endurance test with the jumpers in place and with the cables energized with their steady-state electrical currents. The final I.R. test was conducted approximately 96 h after completion of the fire endurance test with the jumpers disconnected.
The results of the I.R. tests are shown in the following table:
INSULATION RESISTANCE MEASUREMENTS Cable Cable initial I.R. ,0hms+ interim I.R. ,0hms+ Final 1.R. ,0hms+
Cnde. (1000Vde-1 Min) (500Vde-1 Min) (1000Vde-1 Min)
Cable Tray Location 26C 13G Condult-To- Red 140C 3/C-No. 14 AWC 4.50 140C 6C w/Stnis. Steel Cable Tray White 160C 14C 6.8C Sheath (E30-0211) Transition Black 12C 12C Cable Tray- Red 900 3/C-No. 14 AWC 7.6C To-Cable Tray White 140C 8.8C w/Stnis. Steel 9.4C 8.6C Black 150C Sheath (E30-0211) Transition 1200 180G Nom. 3 in. Red 2000 3/C-No. 14 AWC 2000 200G 110C w/o Stnis. Steel Di am. Conduit White 1800 130C 1600 Sheath (E30-0208) System Black 7.2C 400 Conduit-To- Red 170C 3/C-No. 6 AWC 50M White 1000 6.8C n/Stnis. Steel Cable Tray 7C 6.4C Black 1300 Sheath (E30-0210) Transition
\
l Page B2 Issued: 4-10-84 File R10925-1 Cable Cable Initial 1.R.,0has+ interim 1.R. ,0hms+ Final 1.R. ,0hms+
Cable Tray Location Cndr. (1000Vde-1 Min) (500Vde-1 Min) (1000Vde-1 Min)
Cable Tray- Red- 130C 56C 1200 3/C-No. 6 AWC 80G 54C w/Stnis. Steel To-Cable Tray White 130C 1100 82C 64C Sheath (E30-0210) Transition Black 200G 170C 180C 3/C-No. 6 AWC Nom. 3 in. Red 150C 130C 1600 w/o Stnis. Steel Diam. Conduit White Black 160C 1700 1800 Sheath (E30-0204) System White 52C 58C 45C 2/C-No. 14 AWC Condult-To-Black 65C 30C 30C S.T.P. w/Stni s. Cable Tray Shield 26C++ 380k+++ 350k Steel Sheath Transiti on (E30-0212)
Cable Tray- White 600 400 50M 2/C No. 14 AWC 22C 200M S.T.P. w/Stni s. To-Cable Tray Black 66C Shield 45G++ 34k+4+ 200k Steel Sheath Transition (E30-0212)
White 68C 110C 95C 2/C No. 14 AWC Nom. 3 in.
66C 110C 100C S.T.P.w/o Stni s. Diam. Conduit Black 1100++ 1.2M+++ SM Steel Sheath System Shield (E30-0209)
+ - C = Cigaohes (1 x Ig' ohms)
- M = Megohns (1 x 10 ohms) k = K11 ohms (1 x 10 ohms)
++ - Shield-to-sheath / ground at 50Vde-1 Min. ,
+++ - Measurements made with Simpson Model 260 Volt-Chm-M1111 ammeter. All other measurements made with General Radio Model 1864 Megohmmeter.
O 4
l l
l File R10925-1 Page C1 Issued: 4-10-84 l
AffEEE13 E 211 k! EI E I E Z E L I A E I E lIg s g a n g I g s I g EEkk-sg55g 3ys5 5ssyygyI .
On March 9, 1984 (17 days after fire endurance test of full-scale test assembly), test potentials were applied to each fire resistant cable to determine " trip" voltage and voltage
- withstand between each conductor and all other conductors plus the shield, sheath or ground. The test potentials were applied and measured using an Associated Research, Inc. AC Hypot Junior Model 4025 voltage source.
The AC Hypot Junior Model 4025 is a nondestructive tester featuring a high reactance type transformer designed so that the output voltage will collapse should the current output exceed a given_value. The instrument used for the dielectric voltage-withstand tests described herein was configured to " trip" at a current output (leakage current, charging current, corona and/or break-down current) of 1 mA.
The results of the dielectric voltage-withstand tests are i shown in the following table. l DIELECTRIC VOLTAGE-WITHSTAND MEASUREMENTS Cable Cable " Trip" Two hinuto Cable Tray Location Condr. Voltace, kVac Sustained Voltace. kVae -
3/C-No. 14 AWC w/ Condult-To Red 1.6 1.5 Stainless Steel Cable Tray White 2.4 2.0 Sheath (E30-0211) Transttion Black 2.2 2.0 3/C-NO.14 AWC w/ Cable Tray-To- Red 2.2 2.0 Stainless Steel Cable Tray White 2.1 2.0 Sheath (E30-0211) Transition Black 2.2 2.0 3/C-No. 14 AWC w/o Nom. 3 in. Red 1.7 +
1.5 Stainless Steel Diam. Conduit White 1.7 1.5 Sheath (E30-0208) System Black 1.55- 1.5 3/C-No. 6 AWC w/ Condult-To* Red 1.5 1.4 Stainless Steel Cable Tray White 1.5 1.4 Sheath (E30-0210) Transition Black 1.5 1.4
File R10925-1 Page C2 Issued: 4-10-84 Cable Cable "T ri p" Two Minute Cable Tray Location Conde. Voltage, kVac Sustained Voltage. kVac I 3/C-No. 6 AWC w/ Cable Tray-To- Red 1.3 1.0 Stainless Steel Cable Tray White 1.1 1.0 Sheath (E30-0210) Transition Black 1.1 1.0 3/C-NO.6 AWG w/o Nom. 3 in. Red 1.7 1.5 Stainless Steel Diam. Conduit White 1.7 1.5 Sheath (E30-0204) System Black 1.8 1.5 3/C-No. '14 AWC 5.T.P. Condult-To- White 2.1 2.0 w/ Stainless Steel Cable Tray Black 2.2 2.0 Sheath (E30-0212) Transition 2/C-No.14 AWC S.T.P. Cable Tray-To- White 2.1 2.0 w/ Stainless Steel Cable Tray Black 1.9 1.8 Sheath (E30-0212) Transition 2/C No.14 AWC S.T.P. Nom. 3 in. White 2.1 2.0 w/o Stainless Steel Diam. Conduit Black 2.2 2.0 Sheath (E30-0209) System I
i l
l 1
File R10925-1 Page D1 Issued: 4-10-84 3EEEEE15 E CSg5g ggygggh1ygg y5hsy33g3ggs sg3pp-sC3pg 13sg assggggg LOCATION OF THERMOCOUPLEs:
The temperatures of each coil of fire resistant cable were measured by two inconel-sheathed chromel-alumel thermocouples having a time constant of 0.5 s. The thermocouples were affixed to the stainless steel sheath of each cable with stainless steel cable straps and were located as shown in ILL. D1.
TEMPERATURES OF THE CABLES:
The temperatures measured by the various thermocouples on the fire resistant cables were measured at 1 min intervals during the fire test. These temperatures ar1 tabulated in ILLS. D2, D3 and D4.
e e
~ . _ . _ _ _ - - _ _ _ - - . , .__._.a
._ ~__ _ .___ _
1 l
l i
File R10925-1 Page El Issued: 4-10-84 4
3-l EEEEEE15 E l
l 1E'EIEEEEEI EEE1EEE11EE E E E E E E'E l
)
l The instruments used.to monitor environment, . input
- electrical characteristics and electrical characteristics of the i
fire resistant cables during the test program were provided by i both Underwriters Laboratories Inc. and The Rockbestos Company. i l
Each of the instruments supplied by Underwriters Laboratories l Inc. was calibrated against an instrument having calibration traceable to the National Bureau of Standards. The calibration l
! records of each instrument are on file at Underwriters
! Laboratories Inc. With the exception of the new Amprobe l
Model ACD-1 digital ammeter, each of the instruments supplied by The Rogkbestos Company bore a pressure-sensitive adhesive label j j indicating recent calibration.
- l. INSTRUMENTS SUPPLIED BY UNDERWRITERS LABORATORIES INC.:
The following instruments were.used in the test program.
FULL-SCALE TEST ASSEMBLY Furnace Temperature Recorder - The temperature recorder used to measure the furnace temperatures was Leeds & Northrup, Model G, UL Instrument No. 6FBSTR.
Automatic Data Loqqer - The digital data acquisition system used to monitor elapsed time and current flow through the LED's of the electrical fault monitoring panel was Acurex Corporation, Model Autodata Ten /10, UL Instrument No. 8FI5DAS.
Ammeter - The hand-held clamp-on ammeter used to check the calibration of the Amprobe Model ACD-1 digital ammeter supplied by The Rockbestos Company was General Electric Company, 0-800 A, 0-750 V, UL Asset Identification No. 65 289.
Voltage Source - The voltage source used to measure dielectric voltage-withstand was Associated Research, Inc.,
Model 4025 AC Hypot Junior, UL Instrument No. 1FD5HP.
Water' Pressure Gauge - The gauge used to measure the water pressure during the two hose stream tests was HTL, Perma-Cal, 0-300 psi, UL Instrument No. 83FA.
~ w
i i
l 4
! File R10925-1 Page E2 Issued: 4-10-84
- i
$ SMALL-SCALE TEST ASSEMBLY t
! Furnace Temperature Recorder - The temperature recorder used
! to. measure the furnace temperature was Honeywell Brown I- Electronik, Model 152P15-PSH-296-III-55, UL Instrument No. 11FB5TR. )
i i Cable Temperature Recorder - The digital data acquisition l system used to measure cable temperatures was Leeds & Northrup, 3 Model Trendscan 1000, UL Instrument No. 2FB5DAS.
INSTRUMENTS SUPPLIED-BY THE ROCKBESTOS COMPANY:
i The following instruments were used in the test' program.
l l FULL-SCALE TEST ASSEMBLY Digital Ammeter - The reference ammeter used to check the calibration of the metering transformers and panel ammeters was an Amprobe Model ACD-1 (Serial No. 833852) hand-held clamp-on digital ammeter. The digital ammeter was new and did not bear a calibration sticker.
Meqqering Equipment - The equipment used to measure ,
insulation resistance was a General Radio Model 1864 Megohmmeter bearing a calibration sticker reading "I.R. Set, Serial No. 2311, checked 4-20-83 by Electrical Calibration Laboratory" and a Simpson 260 Volt-Ohm-Milliammeter bearing a calibration sticker reading "I.R. Set, Serial No. 712397, Checked 4-18-83 by i Electrical Calibration Laboratory." '1 SMALL-SCALE TEST ASSEF2LY Digital Multimeters - The four digital multimeters used to measure voltage and current were Beckman 3010 Digital Multimeters. Each digital multimeter (Units DMM-31027035, ,
-31027364, -31027435 and -31027447) bore a calibration sticker i reading " (Unit Number) , Calibrated 3-7-84 by Robt. A. Gehm, New Equipment-Factory Calibrated-Checked AC Amp Ranges."
PLA14 VIEW OF TEST ASSEMBLY I
NORTH 1 l
NOM. l["p f,(2)7d MAIN CABLE MOM. 3"#
RIGID STL.Cf*4DuiTs TRAY SYSTEM RIGID STL. !
- / TRANSITION I COMDOITS a J -
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6'- 9 "
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j CABLE TRAYS, ELBOWS & SPLICE PLATES MANUFACTUR*ED BY METAL PRODS.
DIV. OF U.G. GYPSUM CO. & DESIGNATED "GLOBETRAY *: CABLE TRAYS & !
ELSoWS NOM.6" DEEP (ACTUAL 6i' DEEP */S7CASLE LCADING DEPTML 24" WIDE UHSIDE WIDTH) "/' 14 GA. GALV. STL. SIDERAILS & 16 GA. GALV. STL.
RUNGS SPACED 9"O.C.
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f.y.- l :PN.:: I ' 'FE MAIN CABLE TRAY SYSTEM
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a i il i 3 STAlt4LESS STEEL SHEATHED AUXILIARY -
c'd l9 lENCABLES AIR-DROPPED To CABLE TRAY AUXtLIARY CABLE TRAY SECTLON A A L4x3d" THICK STROCTORAL STEEL ANGLES SUSPENDED BYi* DIAMETER THREADED STEEL RODS WITH STEEL NOTS CABLE TRAY SYSTEM DETAILS RIO925-)
ILL.2
-. - . - ..- - - - . . - - - . - . - - - . . . . - - . - . - . - . . - . - . . ~ _ - _ - _ _ .
EAST f 3/C 14 AWG */STNLS. STL. SHEATH j
(TRANSITION FROM CONDUIT) 3/C-6 AWG */STNLS. STL. SHEATH 7/C-14 AWG 5.T.R */STNLS.STL. SHEATH (TRANSITION FROM CONDUlT) (TRANSITION FROM CONDulT) k ,
1' j
W n" i I
ci a 2/C-14 AWG S.T.R */STNLS.STL SHEATH 3/C-6 AWG */STHLS.STL. SHEATH
{ 3/C 14AWG */STNLS.STL. SHEATH L
MAIN CABLE TRAY SYSTEM i I
r3/C-M AWG */STNLS. STL. SHEATH (AIR DROP FROM MAIN TRAY) 2/C-14 AWG S.T.R */STNLS.STL. SHEATH 3/C-6 AWG */STf4LG.STL SMEATH (AIR DROP FROM MAIN TRAY) i, (AIR DROP FROM MAIM TRAY)
,,,,,,,o _-- -
AUXILIARY CABLE TRAY l
FDEL LOADING CABLES:
MAIN CABLE TRAY SYSTE.M AMD AUXILIARY CABLE TRAY EACM PROVIDED */ RANDOMLY-LAtD. 41.5 % FILL OF' FUEL LOADING CABLES. l PERCENT 55' CABLE LOADING DEPTH AND FILL BASED AGGRE4 ATE ON 24" CABLE TRAY CROSS-SECTIONAL AREWIUTH,A OF 67.29 SG. IN. FOR F0EL LOADING CABLES. FUEL LOADING CABLES IN MAIN CABLE TRAY SYSTEM l TERMINATE AT UNDERSIDE OF FLOOR.
THE TYPE AND QUANTITY OF FOEL LOADING CABLES IN EACH CABLE -
TRAY ARE TABULATED BELOW:
CABLE. CABLE. CABLE CABLE TYPE INSUL. MAT'L. JACKET MAT'L. O.0. QUANTITY 9/C-12AWG EPR/HYP HYP o.858" 16 PCS.
3/C - 2AWG XLP HYP l. 03/," 16 PCS.
37/C-12 AWG XLP PVC- 1.250" 8 PCS.
19/C -12 AWG PE PVC 0.935" 36 PCS.
SAMPLE LOCATION IN CABLE TRAYS R~t0925- 1 lLL.3
l
+ NORTH 1
- THREADLESS T*lBER BUSHING (TYPICAL) t>
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l 9
( THREADED CONNECTORS t l
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S'- O" 2'9" :
i I3'- 6"
=
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(2) 3/C-14 AWG hSTHLS.STL. SHEATH
- 1) 3/C-6 AWG W/o STNis.STL. SHEATH (3) 2/C44 AWG S.T.f' */o STNLS.
STL. SHEATH (ONE CABLE ENERGlZED)
[((OHE (2)3/C-6 3/C-14AWG AWG "fe STNt_s.sTL. CABLESHEATH ENi q'
[((ONE.S/C-6AWG CABt.E EN
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+ 4"- p - 4"-
nn nn T T BECTION A A L4x3xi" THICK STRUCTURAL STEEL ANGLE St)SPEllDED BY 1* DIAMETER. THREADED STCEL RODS WITH STEEL NWS CONDUIT SYSTEM DETAILS
~
160925-1 ILL.4
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- .:.. l ;' T*:' .s.k S "
FRO ' S CoDOITS STNLS. STL SHEATHED CABLES TRANSITION COUPLING FOR fA)R-DROPPING TOTOP OF '
Cot 4D0lT TERMINATION MFRD. A 4-l "l { MAIN CABLE TRAY SYSTEM BY RoWE IND.(*2RT9006 Fog 1;I pCONDUlT # +, I I' s
{p" CONDUIT) 3 3RT9006 FOR II" ,j --
m .. .
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. NOMd~p RIGID STL.COND0lT */(1)
NOM. II"W RICID F7L. CollDulT ' ' 3/C-14 AW CABLE l
- RI) 3/C-6 AWA c%BLE .
140M. "o RIGID STL. Cot 4D0lT*/(1) l 2/C 1 AWG S.T.P. CABLE !
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ANGLE SOSPENDED BY i* DIAMETE.R THREADED STEEL RODS W/ STEEL MTS I
TRANSITION DETAILS RIO925-1 1LL.5
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FURNACE TEMPERATURES . . r R 10925-1 -" b,l' ( ,'
i reanuaar 21, atos l is.'
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' I k- r 1 Fire Endurance To.1 '
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3/C-No.14 AWG AC C O I I O BC C N I O OPEN 480 V "" 0 CIRCULT CC C O--4 1 NEOTC C O 4 t- 0 WITH ALL SWITCHES Ct.OSED, METERS READ THE' SUMMATloN of- Sp LEAKAGE (CHARGING) CORRENTS WITH A AND ?!EUT SWITCH Closed,B AND C OPEN,MEiER REAPS INDIVtDUAL LEAKAGE To GP,oOMb 2/C410.14AWG S.T.P.
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SCHEMATIC OF TEST MEASUREMENTS R fo925-l ILL.24
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r THE ROCKBESTOS CO. v1V. OF FILEH R10925 CEROCK W1 reb. CABLE GROUP I NG. PROJECT # 84NK2 3-9-84 SMALL-SCALE FIRE ENDURANCE T EST THERMOCOUPLE (NO'S) 1 2 3 4 TIME
,' (MIN'S) ,
< 1 841.6 465.7 738.3 1105.2 .,
l 2- 846.3 463.8 781.2 960.5 j 3 782.1 407.5 748.0 873.0 1 4 802.0 422.5 757.0 906.7 j 5 1049.7 644.0 944.7 1277.0
- 6 1095.2 725.5 1014.2 1273.5
- l. 7 1081.4 707.8 1005.4 1226.2 !
8 1146.7 803.4 1065.3 1316.2 ;
9 1170.9 849.2 1102.2 1331.2 i i 10 1180.0 882.3 1124.6 1366.9
- 11 1192.6 919.7 1138.5 1376.8 12 1216.1 953.6 1161.6 1412.3 13 1233.9 996.6 1177.5 1432.1 14 1262.3 1036.5 1204.0 1455.9 15 1285.3 1062.6 1217.7 1461.7 16 1302.5 1093.1 1234.4 1474.1 17 1305.7 1108.7 1246.8 1481.0 i 18 1317.0 1131.9 1257.6 1486.2 j 19 1
1319.4 1145.2 1257.9 1493.9 20 1328.6 .1165.2 1272.8 1505.9 21 1350.9 1196.1 1285.6 1525.6 22 1370.8 ,
1209.0 1312.5 1530.5 23 1381.6 1225.1 1314.3 1534.5 24 1381.3 1237.1 1314.9 1530.3 25 1390.2 1254.7 1332.5 1543.1 26 1403.1 1276.4 1345.0 1556.0 27 1417.2 '
1293.3 1352.6 1557.4 28 1425.9 1305.4 1360.8 1564.2 29 1444.8 1321.1 1374.6 1572.5 30 1456.4 1338.2 1391.2 1584.4 31 1473.2 1353.6 1406.9 1594.4 32 1483.1 1367.1 1418.6 1599.4 RIO925-1 ILL.1)2L
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THE ROCKBESTOS CO. DIV. OF FILE 4 R10920 i CEROCK WIREt< CABLE GROUP INC. PROJECT 4 84NK.:. l 3-9-84 GMALL-SCALE FIRE ENDURANCE TEST .
I THERMOCOUPLE (N0'S) 1 2 3 4 TIME (MIN'S) 33 1493.0 1376.6 1429.9 1606.2 34 1488.0 1384.4. 1428.5 1606.5 35 1495.4 1396.3 1441.5 1615.2 36 1520.5 1406.7 1454.3 -
,1624.9 37 1520.1 1421.9 1456.9 1630.6 38 1525.8 1432.9 1471.0 1633.8 !
39 1527.8 1444.2 1467.6 1638.7 )
40 1545.3 1457.2 1490.0 1646.5 41- 1549.0 1465.3 1496.5 1651.5 42 1558.0 1472.4 1495.0 1658.3 43 1559.9 1478.8 1503.5 1661.4 44 1560.4 1485.9 1505.6 1664.4 45 1555.9 1497.0 1489.2 1674.9 46 1568.9 1510.4 1503.9 1684.0 47 1585.6 1524.7 1519.5 1691.9 48 1597.9 1533.2 1535.7- 1695.0 49 1590.3 1532.0 1532.1 1697.4 50 159?, 1 1536.8 1535.1 1700.3 51 1604.8 1543.0 1545.0 1703.6 52 1612.7 1547.3 1546.6 1708.3 53- 1603.5 1555.7 1538.4 1715.4 54 1607.1 1562.3 1541.5 1719.6 55 1610.1 1568.1 1545.0 1717.3 56 1615.4 1577.9 1547.8 1722.9 57 1627.0 1580.6 1556.1 1729.6 58 1627.4 1583.0 1556.6 1734.3 59 1633.8 1590.2 1565.4 1733.6 60 1627.0 1583.4 1566.0 1728.2 61 1622.5 1582.0 1561.2 1729.7 62 1632.3 1593.3 1560.0 1730.9 63 1645.5 1604.7 1576.3 1744.2 64 1652.5 1616.0 1587.5 1748,6 R10925-1 oi r3 2
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s THE ROCKBESTOS CO. Til V. OF FILED R1092S CEROCK WIREbCABLE GROUP INC.- PROJECT # 84NK2.1 i
,3-9-84 SMALL-SCALE FIRE ENDURANCE TEST THERMOCOUPLE (NO'S) 1 2 3 4 TIME l (MIN'S) 65 1646.2 1611.6 1579.3 1749.7 j 66 1645.0 1612.5 1578.5 1748.2 '
67 1649.0 1617.2 1581.8- 1751.7 :
68 -1659.3 1626.3 1594.8 1760.0 69 1673.4 1630.6 1609.3 1763.2 70 1671.9 1634.8 1605.1 1768.4
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