ML20045E258
| ML20045E258 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 02/28/1985 |
| From: | Mccue L MISSOURI, UNIV. OF, CAPE GIRARDEAU, MO, THERMAL SCIENCE, INC. |
| To: | |
| Shared Package | |
| ML20045E211 | List: |
| References | |
| NUDOCS 9307010302 | |
| Download: ML20045E258 (36) | |
Text
A ATTACHMENT B TSI TEC"HNICAL NOTE 111781 ENGINEERING ' REPORT ON AMPACITT TEST FOR 600 VOLT POWIP. m.TT5 INSTAT.in Di A FIVE FOOT LENGTE OF TWO IRCE CONDUlf PROTECTED WITH TEEF& LAG 330-1 SUBLIMING COATING DTELOPE SYSTEM FEBRUAET 1985.
STE RETISION:
NOVEMEE1 19El ORIGDU.1 DATE OT ISSUE:
THERMAL SCIENCE. INC. AND ITS EMPLOYEES AND AGENTS SHALL HAVE NO 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 INCLUDED IN THIS REPORT.
9307010302 930623 PDR ADOCK 05000219 P PDR THERMAL K.ItNLt., INC.
- 2200 CASSEN!. DR.
- ST. LOUIS, MO 63026 a (314) 349 1233 Tedex: Domesht 44-2384 = Oveneos 209901 = Telec@r (314) 349-1207
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.TSI TECHNICAL. E TE 111781 .'1 i
=3 DG11.EERING REPORT -l 5
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' AMPACITT TEST POR 600 VOLT POWER-CABLES. '
INSTALLED IN 'A FIVE POOT LDGTB OT TWO 'INCE' CONDUIT :!
PROTECTED VITH ;
THERC-LAG 330-1 SUELIMING COATING' ENVELOPE SYSTEw.
L.'F. PETER MCCUE
' PREFAFE BY: j CONSULTING ENGINEER _
CAPE GIRARDEAU.--MO.;
s THER*.AL SCIENCE. - INC. l-("TSI"1 .!
PFI?AFE FOR: 2200,CASSENS DRIVE-l ST. latIS. MISSOURI ~63026
-1 DATE ISSUED: NOVDGER 1961' 1ST RITISION: TEEFIAPI I962-2ND-REVISION: MARCE-19E2' AUGUST 19E3' 3RD REVISION:
4TE REVISION: SEPTDGER 1983.
FEBRUARY 1985 STE REV1SION:
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TABLE OF CohTENTS r
PACE ' NO.
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l' 1.0 FURPOSE OT' TEST
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2.0- TEST SET UP 2
2.1 CONDUIT TRAY ASSEMBLY 2'
2.2 PCNT.R CABLE
'2' j 2.3 PO'.*ER SOURCE i 2-2.4 EEAT~ LOSS REDUCTION
.2 !
2.5 INSTRUFINTATION .-
3.0 TEST PRDCEDUFJ i
' 7 i-3.1 UNPROTECTED CONDUIT TEST ASSEMBLY 3.2 toh*DUlT TEST ASSEMBLY PROTECTED WITE A ~
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SUBLIMING COATING ::
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/ ~4.0 ANALYSIS OF TEST RESULTS 11 4.1 UNPROTECTED CONDUIT TEST ASSEMBLY' ,
1 4.2 CONDUIT TEST ASSEMBLY PROTECTED.WITH A 11-SL'ELIMING COATING ~!
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2.1 LOCATION 0F TEST ASSEMBLY AND AMBIENT. ;
5 TEMPER.ATURE TElt.MDCOLTLES IM- TEST. CHAMBER - 3 2.2 SCEMATIC CIRCUIT DIAGRAM 4
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2.3 LOCATION OF. TEPJOC01.7LES WITHIN TE TEST ASSEM5LT 6: -l
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LIST OF TABLES- :
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TABLE 1 ll TABLE 2 TEST DATA TOR A TIVE FOOT LENGTH OT TWO INCE CONDUlT PROTECTED WITE A '!
SUBLIMING COATING. 10 '!
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- AMPACITY TEST FOR 600 VOLT POWER CABLES' ;
'INSTALLD D A FIVE FOOT LENGTB 0F .1UD DCB CNDUIT - .
PROTECTD WITE .l
^ THEPJO-LAG 330 SUBLIMING' CQATING, ENVELDFE STSTEM .
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\'I 1.0 PURPOSE OF TEST l i
The purpose of this test was to deterzine . the effect. of the' application- 1 1 of a 1/2 inch minimum dry film thickness of. TEI2.T-LAC 330-1 Subliming. Coating on the temperature rise and ampacity 'of a 600 Volt #00: AWG .; power cable installed in a five foot length - of two ~ inch " conduit. - .This ' j 1 test vas condueted in accordance with - AIEE Pub.- No. 5-135-2. . IPCEA : ! Pub.'Bo.~P-46-426(" Power Cable Ampacities". q h 2.0 TEST SET UP The te.st was conducted at - the -laboratory f acilities 'of TSI,' Inc. .- ;
' -3260 Brannon Avenue, St. Louis, Missouri (63139), on October 23 and -
October 24,'1981. ;! For tes t purposes , . the ' conduit tes't' assembly was placed: on two 2" x 4"4 l wooden blocks within a 4 ' by . 5'L vide by ,29\": deep test' chamberi constructed ] of 3/E" plywood. The test chamber, in4 turn.~ wasl placed: on ,the ~ surf ace of a (' laboratory bench. The desired level of adient temperature was. provided within the test' chamber by. means - of three heat lanps located . in the f top of the enclosure. - and two hot plates located at the bottos .of the ' enclosure. The entrance JE and exit openinFs f or the power cables,'. at one eci of the; test! enclos'ure.: were ' sealed . by. means of ' a 2" shroud ~ of ceramic wool. Likewise. the entire ' surf ace of; all power cables, entering the test enclosure fros"the:. ; junction with their. power supply and power cables . leaving- the test ? j ' enclosure all the-way to the energizing variac.- were covered with' a' 2"
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ceramic wool shroud in order to minimize heat-losses. , 1 l
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2.1 Conduit Test Assembly- ; [ the conduit test assembly was constructed of a five foot *. section of. . 2" Schedule 40 rigid . steel conduit. The inside diameter of the: rigid steel conduit was 2.10" and the cross oection area of the conduit was 3.46 square inches. The test- assembly was used for the unprotected baseline > conduit tests. A separate but identical conduit assembly was protected; , with ; the TEERMO-IAC 330-1 Subliming Coating Envelope System. [ 4 2.2 Power Cables
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A 21 foot length of f00 AWG power cable was folded'into two.' loops and l then. installed in each five foot length of two inch conduit.- The. power cable was approximately 0.562 inches in diameter, had 0.25 square inches - 1 in the cross sectional area, and was made of 19 strands of 0.0627 inch ! diameter copper wire. t A schematic, which shows the cable tray test section mounted in the'. test . ;
- chamber together with the location of the ambient. temperature thermocouples within the - test chamber, is presented in Figure 2.1.
2.3 . Power Source 1 A 200 volt. single'. phase, power source was .used to energire the' #00 AE l power cable conduit. The power source was equipped with a variac, and l a current transformer as shown in Figure 2.2. .> i i
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Tne tw ends of the conduit together with the cables emerging from the' :i ' conduit ends were wrapped with a ,2' inch thick piece of TEER.0-LAG 330-70, Ceramic Blanket. The ' ceramic blanket vrap was' then secured to the. conduit and the cables by wrap;ing it with duct tape. .This step was.taken to , reduce the amount of heat loss from within the conduit sectio: and'froc the cable lengths tha: were not located within the conduit section. 2.5 Instruw.entation . The test instruments and devices used during the as:pacity test consisted of three thermocouples, a thermocouple temperature recorder, an asuneter, , a voltmeter, a digital readout and a current transformer.
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CONDUIT. TEST ASS M 1.Y MhTED ON WOODD BLOCKS IE TEE TESI CEA.%D, i 2" THICK TEEPJo-LAG 33D-70 CohTOFNBLE CERAMIC 31.AhT.ET f00.AU;;;
' POWER CA) 3 LINE'li a
FIGURE 2.1 1hCATION OF TEST ASSEMBLY- AND AMBIENT TEMPERATURE , TEIRPOCOUPLES D TEST CEAMBER-I A 3 3
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< 4 3' SECTIONS OF f00 AWG POWER' CABLE EACH SECTION 7 FEET LONC - ALL IN SERIES. ;
VOLTMETER Y
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CURRENT TRANSFORMER- l R 1 i TICUE 2.2 SCHIMATIC CIRCUIT DIAGRAM 4 1
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t i i f 2.5.1 Thermoc ouples Three (3) thermocouples were installed in the ce.nter of the 2" conduit section. The first two thermocouples were located six inches on each side of the midpoint along the length of the conduit and the third was located an additional six inches away
,j from the midpoint. They were embedded in slits made in the cable -
insulation. ne location, of the three thermocouples within the test assembly, is abovn in Figure 2.3. 2.5.2 Thermocouple Recorder A Brown Multipoint Thermocouple Recorder was used to record the te=perature of the power cable circuit at the locations previously described. Calibration of each therr.ocouple was checked against a standard thernometer by comparing the thermocouple readings at root te=perature and in boiling water. The deviation was less than 1* C f rom the k:nown temperature in each case. 2.5.3 Anneter The arneter used to measure current in the power cable circuit was placed in series with the power cable and one of the output lines f rom the current transf ormer. The anneter was a General Electric Unit vitb a readout range frac 0-300 amperes. The current transf ormer was a Westinghouse Unit with a max 4-~ output of 400 a= peres. 2.5.4 Voltmeter Tbc voltneter used in the f 00 AW power cable circuit had a readout range of 0-50 amperes. 2.5.5 a^ 1ent Temperature Digital Readout ! An Omega Engineering Unit was used to provide a digital readout of the ambient temperature during the test. i 5 I
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i EXTEINA1. AND INTERNAL . RIGID STEEL CONDUIT DlAMETERS #00 AVO PA N CABLES 3' LI 60* go gli O 2 BCE DIAMETE SCHEDL1E. 40 g R.ICID STEEL CohIIT I
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4 k inch p Ceating ! Thiche55 [ J TICURE 2.3 LOCATION OF THERMOCOUPLES WITHD THE TEST ASSEMBLY g A
l l l 3.0 TEST FROCEDITFI The ampacity test was conducted in two separate but interrelated phases. , The first phas.e consisted of establishing a base line ampacity for l the power cables when installed in the unprotected conduit test assembly.
,- The nie<:ond phase consisted of determining the aanerage derating which !
occurs when the conduit test assembly is enclosed by a protective envelope of THEPJO-LAG 330-1 Subliming Coating Envelope System. These i tvo test phases are described in the following paragraphs. 3.1 Unprotected Conduit Test Asse=bly The base line a=pacity test was started by energizing the power sources to produce an initial a=perage of 160 amperes in the #00 AW, power cable circuit. This a=perage level was then maintained in the power circuit until one of the thermocouple temperatures stabilized within the designated temperature band of 194 2 3*T (9012*C). The elapsed time for this pre-test period was circa four bours. Throughout this and the subsequent one hour test phase, the a=bient te=perature withi.c the test enclosure was maintained at 104 1 5"T (40 2 3* C) . Once the base line test was initiated, it was continued f or one bour. ' During the test the a=perages, in the power cable, the hot spot cable thermocouple te=perature, and the ambient te=perature, were recorded at 5 minute intervals. The recorded base line anperage of.152 a= peres was then corrected to
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reflect a 40* C a=bient te=perature test condition and a 90*C conductor temperature , using the correction tables presented in the AIEE Pub. No. 5-135-2, IPCEA Pub. No. P-46-426 entitled: " Power Cable Ampacities". After correction, the base line a=perage beca=e 153.16 a= peres. The base line test a=perage and te=perature together with the a=perage correction calculations are sboen in Table 1. 7
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. BASE LDIE-TEST DATA
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'- Average Maximum #00 AWC ' ,
Ambient . Cable Power. Temperature: Temperature- Cable'. ' The - *F *F' Mers-i 3:00 PM 106 194 152 ' 106 194 1152 3:05 FM 1 3:10 PM 105 '194 152 105- 193 l152 Li 3:15-PM 105 .193 ~152 . - 3:20 PM 3:25 PM 105 193- '152. ' 193 .152 3-3:30 PM 104 105 ~193 ~152 d 3:35 PM ' 3:40 PM 105 -193' 152-3:45 PM 105 193~ 152:
- 3:50 PM 104 193 152 ._
3:55 PM 104 193 -152 l 4:00 PM 104 193 152 i 104 '193 152; 4:05 FM
,104.79'T (40.44'C)L Average Achient Temperature:
Average Cable Tez:perature: 193.21*F-(89.56*C)9 .- - yi
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. Tempera:ure Correlation Per - 40 ! ~ x 214S 5-+ 8955iI J I 15 234.5 +:.90:
'IPCLA P-46--426 : . 49.56 - 40.44. ~
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r 3.2 Conduit Test Assembly Protected With A Sub11 ming Coating Upon completion of the base line test. the other conduit test assembly, coated with 1/2 inch minimum dry film thickness of TERJO-1.&C 330-1 Subliming Coating, was installed in the test fixture.
,.' The test was started with the current flow established at 155 amperes in the power cable circuit. This current level, which was developed in the first test phase, was maintained until the temperature limit of 194*T (90*C) was reached by the hottest cable thermocouple. At this point, the amperage was gradually reduced until the hottest cable thermocouple stabilized within the designated temperature band of 194 1 3* F (90 2 2' C) .
Af ter the te=perature had stabilized for one hour, the test run was initiated and continued for another hour. During the test run, the circuit amperages, the hot spot cable thermocouple temperature and the ambient te=perature were recorded at 5 minute intervals. The test a=perage of 142 amperes was then corrected to reflect a 40* C ambient tenperature condition and a 90*C conductor te=perature test condition using the correction table presented in the AIEE Pub. No. S-135-2, IPCEA Pub. No. P-46-426 entitled: "Pover Cable Ampacities". Af ter correction, the test amperage became 141.72 amperes. The test amperages and te=peratures together with the amperage condition f actors are shown in Table 2. 4.0 ANALYSIS OF TEST RESUlTS The hottest cable thermocouple temperature, together with the ambient . te=peratures and power cable ampenge readings, were recorded at 5 r.inute intervals during each of the tests. These test results, which are shavn in Table 1 and Table 2 are analyzed and discussed in the f olloving paragraphs. 9
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1 - TABM 2' ' p TF.ST DATA FOR A FIVE FOOT LDICTV 0F TWO DCE CONDUIT PROTECTED WITH THERE-1AG 330-1 EU31.IMING C0ATING ENVEIhPE SYSTDI F f
' Averase Maximum Joo Awc. ' -
Ambient l Cable Power-
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' Temperature Temperature Cable
. Aserage : I Time *F- _
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2:30 PM 102 193- :142 102 193- 142 , 2:35 PM l 2:40 PM 102 '193 142? 2:45 PM 103 193 142- . 2:50 PM 103 193 142. . 103 193 142' j 2:55 FM 103 193 142-. 3:00 PM 3:05 PM 103- 193 , 142 --- 3:10 PM 103 193 :142 3:15 PM. 103 -193 142 , 3i20 PM. 103 193' 142 3:25 PM 103 193 142. 3i30 PM .103 193 142 103 193- ;142 3 3:35 FM ! J 102.786*T' (39.33"C) 4' Average A=hient Temperature: 4 Average Cable Te:perature: , 193*P-(89.44*C) , Te:perature Correlation Per' .f. -i IPCD. P-46-426: I .14 SD 40 . * - 234.5 + 89.44L 69.44~ .39.33: 234.5.+ 90' l
-I= :141'.72 Amperes
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2/g5 _ l' . i 4 r' 4.1 Unprotected Conduit Test Assely The temperature readings for the hot spot thensocouple remained within the 194 2 3*F (90 2 2*C) temperature rage during the one bour test period. The temperature ranged between 193 and 194*F during the test. The pcwer cable current remained constant at 152 amperes throughout the one bour test. The ambient temperature within the test enclosure average 104.79'F vith all temperature readings f alling within the prescribed test range of 104 2 5*F (40 2 3*C) during the test. 4.2 Conduit Test Assembly Protected With A Subliming Coating The temperature reading f or the bottest thermocouple rose to 193*F (90*C) vben the power cable circuit was energized at the 155 amperes level established in the base line test. The power cable current then was reduced to 142 amperes and the temperature readings f ree this thermocouple stabilized at 193*F f or the remainder of the test. h power cable current remained at 142 amperes throughout the one hour test period. The ambient temperature within the test cha=ber ave _ra ge 102.786*F vithin the prescribed test range of 104 2 5*F (40 t 3*C) during the test. s 5.0 cant _rSIONS m test results indicate that the sapacity of three lengths of #00 AVG power cable, installed in a 2 inch diameter rigid steel condait, should kbe derated by 7.471 when the conduit is protected with a 1/2 inch 1 :1r.1x .= dry film thickness of TEEE.0-IAG 330-1 Subliming Coating Envelope Systes. This derating f actor was calculated by subtracting the test ampacity g of 141.72 a= peres f roc the base line amperage of 153.16. dividing by the ba.se line value of 153.161 and ther multiplying by 100. & this basis, the derating f actor was determined to be 7.471. The derating f actors apply to the thickness of the THEFJO-LAG 330-1 Sub11 ming Coating Envelope System as tested, and tolerances employed in this test program which was 0.625" 2 0.125", dry. 1 The test results obtained for derating the f00 AVG power cable may be used f or all sizes of cable with sinflar amterial. This is based on J. Stolpe's work which indicates that derating should be independent of cable size. ; l i l 11 i
ADDDinA r Recent IEEE draf t bulletins for ampacity derating tests, suggest the use of racevay sections larger than the 5 foot section used f or this test. Since this test was conducted in November 1981, the IEEE raceway length could not be anticipated. However, the 5 f oot raceway used in this test vill not in any way invalidate the test results. The length of racevay will af fect two parameters:
- 1) The ten:perature o6cillations in both the cable conductor and the surrounding ambient air in the test box.
- 2) End ef f ects where the cable enters and exits the test box.
Each of these parameters vill be considered below:
- 1) Ter:perature oscillations The ten:perature oscillations are a function (among other things) of the air volume between the racevay and the test box, and the total area of fire barriers on the racevay - both of which are a linear f unc tion of the raceway length. During the tests, the te:::perature variations f or both the conductor tec:perature and the ancient test box temperature were within the allovable 12*C during the one hour test period. In addition, the average value f or conducter ten:perature and test box ambient temperature were norrmalized to the base 90'C/40*C i
using the current correction f ormula given in IPECA Publication N o . p-4 6-4 26 (1962 ) on page III. equation (5). ,
- 2) End Effects 1
A short raceway vill be vulnerable to end eff ects which are caused ) by the localized het spots where the raceway enters and exits the j test box. These hot spots are caused by the cerar.ic fiber packing. l and are typically in the range of 5*C ten:perature rise. The het I spots vill cause a ten:perature gradient in both the invard and 1 outvard direction. The ten:perature gradient will exist f or only { several inches into the test box. not enough to af f ect the test i results, since the conductor thermocouple _ locations are well into j the test box. J (a)
n. TESTING i - -
.c LABORATORIES M e tellu r gis t s I
2350 Seventh Blvd.
- St. Louis Missouri D104 314/771 7111 ATTACHMENT C I. T. L. REPORT NO. 84-10-5 ENGINEERING REPORT ON AN AMPACITY TEST FOR 600 VOLT POWER CABLES INSTALLED IN A FIVE FOOT LENGTH OF TWO INCH CONDUIT PROTECTED WITH A TiMEE HOUR FIRE RATED DESIGN OF THE THERMO TAG 330 FIRE BARRIER SYSTEM i
ISSUED: OCTOBER 1984 THERMAL SCIENCE, INC. AND ITS EMPLOYEES AhT AGENTS SHAI.L HAVE NO 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 INFOPJiATION INCLUDED IN THIS REPORT.
Q'; ,5 4.-: ,. , ~.I N DUOTRI A L :
- e. TOOT 3 N G LADORATORIDO-
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_ (~ I.T.L. R.EPORT 90. 84-10-5
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TABLE OF CONTENTS . 9
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'SECTION TITLE PAGE NO. <
1,0 PURPOSE 1 t
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2.0 TES 'LO 3.TIDs .)- 1 3.0 -TEST SI UP 3.1 CD:OUIT TEAY ~ ASSD3LY ' 2i 2 3.2 POkTR CABLE 3.3 P0kTE SOURCE ~ '2 3.4 HD.T LOSS REDUCTIO;; 5 -'- 3.5 INSTRD2 GATIO:: :5 4 , C' ,TES~ Fi'CEDL~RI 7
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4.1 U!.?P.02 ~IED 00 DUIT TEST ' ASSD5'.Y ' 7 8 4.2 PROTER ~: C0!OUIT -TEST ASSD3LY'
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1-*.Ti 72.7ED CO: OUI! TES~ ASSD2'.Y ~ lF 5.2 FilTE.7. C- CO:OL'II TEST ASSDSLYl -11~ CONCLUSIONS 12 6.0-ADDENDA -A-li (iii).
r I N DU3T RI A L.
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TCOTI N G L A CO R ATG R I E S anc. E'
- 1. T. L. REPORT NO. 84-10-5 r
i <. ': TEST DATE: 29 SEPTDGER 1984 r TESI: AMPACITY TEST TOR 600 VOLT POkT.R CABLES INSTALLED IN A FIVE TOOT LENGTH OT TW INCE CONDEIT PROTECTED k'ITE A THREE HOUF. FIRE RATED DESIGN OF THE THER.MD-LAG 330 FIRE BARRIER SYSTD: f 1 f W l .w
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Ary:gyrp n ALLAN M. SIEGEL, P.E. v DIRECTOE IDl'STEI AL TESTING LAIDIATORIES, IN;. 235C SEVENTE B0llEVAC
' ST. luJIS, MIS 50UR] 63104 OCTOEEE 1954 (i) b.
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, L A DO R ATO R IOD 300 I 1. T. L. REPORT No 84-10-5 TEST ATTEh' DEES e
Test Date: 29 September 1984 Supervising the tes: for Industrital Testing Laboratories, Inc. Donald 1.. Stor ent, P.E. Vi:nessing thc test for Therral Science, Inc. Rubin Feldcan, President C'rertti ; :Pt tes: c;uirrer- fer The r_al Science, Inc. Vi1^rur Faddock, Vice President of Operaticns (ii)
r- 'l - (' . . . INCUDTRI AL TSOTING LADORATORIOC ' i n c. -t s Y' I.T.L. REPORT No. 84-10-5 LIST OF FIGURES TITLE Pact ytyggg FIGl?l N: I LOCATION OF TEST ASSIMBLY AND ASIENT TD:PERATURE TIERMDCOUFLES IN TEST CHASER 3 2 SCED:ATIC CIRCUIT DIAGFJJ: 4 l 3 LOCATION OF THEDi3COLTLES WITE TESI ASSDGLY 6 (iv)
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" LIST OF TABLES ,
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. TITLE PAGE NO.
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9- .e 2 BASE LINI TEST DATA-i 1 TEST DATA FOR A FIVE : FOOT LENGTE OF' < Tk'O INCE CONDUIT TROTECTED .k'ITE A -
-TEREE HOUR TIRE RATED DESIGS OF;THE'. .. 4
- THEUD-LAG 330 FIRE BARRIER SYETTy .
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. 'LAGO R ATORI EE -
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- 1. 7. L. REPORT NO'84-10-5.
- ENGINEERING REPORT ON AN AMPACITT TEST FOR 600 VOLT P0k'ER CAELES T INSTALLED IN A FIVE FOOT LENGTH OF Th'O INCH CONDUIT ,
i s-PROTECTED k'ITH A . sv-THREE HOUR FIRE RATED DESIGN OT THE THERMO-LAG 330 FIRE BARRIER SYSTD! :
; . C. PGPO!I The purpose of the test was to determine . the ef fect ' of . the application of a ' three hour fire ~ rated design (one- inch (1") sinitu- - dry filt thickness) of the THERM 0-LAG 330 Fire Barrier Syste:., on the te perature-rise and anpacity of a 600 volt f 00. A' G power catie, insta13 ed in a - five--
for: 1encth of tve inch conduit. This~tes vas=cenducted'in a:tordance: i viti A:EI Publication Ne. 5-1135-2, IPCEi. Put . K:. P-46-426 (1952). ' entitled: " Fever Catle Arpacities."
~.0 TEST LOCATIOS i*
The tes: vas cenducted at the laboratory f acilitier of = Thernal Science . -
-In: . . ("!SI") in St . Louis, Misseurf, en 2C Sette:bcr'1954, ani vitnessed by a ' representative of Industrial Tes:ing-Laberateries , Inc. in St. Leuir. Missouri. The duration' ef the - atra:ity. derating tes: va .c e n t. h:;r. ~nt da:a fre: this tes: vas co- are: :: :he base _: c
- (r. ::. : : : b :.ziri : fir the : c. r : c niu:tei'a: .: 's lai ra':--' ' --
) 0:::ter I W. en the satt.unprote::ei tes: atsc:bl..
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>- .c r. . ,v r. 7 Tor' test purposes',..the conduit test assembly was place'd on'two 2"x4"
- vooder blocks with a- 4' _ by 5' vide' by 29b" deep test chamber constructed -
of 3/8" plywood. The test chamber -in turn, was placed-on.the surface of, a laboratory bench.. I
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- . E I. s W The desired level of ambient temperature was provided within the test -
chamber by means of three heat lamps located in the . top of the~ enclosure and two hot plates located at the bottom of the enclosure. . The entrance
.f. and exit openings for the power cables, at one end'of the test' enclosure, were sealed by means of s'2" shroud'of ceramic wool. Likewise, the .
r; entire surf ace of all power cables, entering the test enclosure from the- '
- ,.. junction with their power supply and power cables leaving the: test-
' enclosure all the way to the energizing variac, were covered with a 2"
_: cerarle wool shroud in order to minimize heat losses. 3.1 Conduit Test Assembly The conduit testLassembly was constructed of a five foot- section of 2" schedule'40 rigid steel conduit. The inside diameteriof-the rigid steel conduit was 2.10 inches and.the cross-sectional area of the conduit was 3.46 square inches. The test asse=bly was used for;the unprotected , base line conduit tests. A separate but' identical conduit assembly was protected with a three hour fire rated design of the THERMO-LAG 330. Tire- 7 Barrier Syster Preshaped Conduit Sections. 5 6 3.2 Power Cables A 21 foot length of $00 AVG cable.vas .f olded into two loops and then
,- installed in each five foot length of-two inch conduit. The power _ cable-was approxicately 0.562 inches in diameter, had 0.25 square inches in the cross-sectional area, and was made of 19 strands' of 0.0627 inch =diareter.
- copper vire.
j A schenatic which shovs'the conduit. test section~ mounted in:the test
- chcrier tegether with the locatier ef; the arbient temperature in Tipure 1. ;
the :::cc;'es within the test charter is str. 4 3.3 Power Source- 3 A 200 volt, single phase.pover source was used:to energizeLthe f00 AWG -1 power cable ~ conduit l. 'The'pover source was equipped with a variac and ) a current transformer as shown in Figure 2. l - H i 1
~* See addenda l for explanation.of 5 foot length.
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t' ' FIGURE 1
',b 1hCATION OF TEST ASSDSLY AND AMBIENT TEMPERATURE THERM 0 COUPLES IN TEST CHAMBER
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CONI II TEST ASSDSLv 2" TE' S CEFJ.MIC WODL ELANE.ET y p 0} V0 m {.0 3.5 AN Tih TE:_, CE.Uh_r.
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t00--AVCe PO'm7.R CAE' Ei 3 LINES..
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- SCHEMATIC CIRCUIT DIAGRAM 7 .;
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F r 3 SECTIONS OF #00 AWG POWER CABLE EACH SECTION 7 FEET LONG - ALL INLSERIES b VARIAC'
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! o p V f 3.4 Beat Loss Reduction The evo ends of the conduit, together with the cables emerging from the conduit ends, were wrapped with a 2 inch thick piece of ceramic wool. The ceramic blanket vrap was then secured to the conduit and the cables by wrapping it with duct tape. This step was taken to reduce the amount
'- of heat loss from within the conduit section and from the cable lengths that were not located with the conduit section.
3.5 Instrumentation The test instru=ents and devices used during the a=pacity test consisted of three ther:occuples, e thernecouple temperature recorder, at =- eter, a digital readou: and a current transformer. 3.5.1 Ther occupies Tnree (3) Thercoccuples were installed in the center of the 2" conduit sectier. The first two therrocouples were located six inches on each side cf the tidpcin: along the length of the conduit and the third was located ar additional six inches away fro: the nidpcint. They were erbe dde d in slits c2de in the cable insulation. The location of the three thermoccuples with the tes: assettly is sho.n in Tigure. 3. 3.5.2 Ther Sccurle Terrers ure Reccrder A Br ow: Multiptint Therre:ouple ie perature Lecorder was used to record the tc ;erature of the rever cable circuit at the locations. previously described. Calibration of each thersocouple was checked against a standard therec=eter by comparing the thermocouple readings at root te:perature and in boiling water. The deviation was less than IC from the known te=perature in each case. 5
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TIGURE 3 f
- IDCATION OF THERMOCOUPLES WITH THE TEST ARTICLE l
EXTERNAL AND INTERNAL l RIGID STEEL CONDUlT D11 DETERS f 00 Ak'? PU,T. CABLES 3 LINES 60 Sct3-
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- 2 TECH DIAMETEF. SCHEDL'LE 40 SCf1
.EIGID STEEL COCrIT.:
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.TEEJ.M:-1.AG - 330 TIF.E E!JJ.IEF SYSTD:
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Il.SE!JED C0!. Cli DESIGN h
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'I 3.5.3 Amoeter ,
~ fr ' The -masmeter used to measure current in the power cable circuitLwas placed in series with the power cable and one of the output lines fric- the current transformer. The ammeter was a General Electric Unit, with a
. readout range from 0-300 amperes. The current transformer was a Westinghouse Unit with a maximum output of 400 amperes, c
3.5.4 Anbient Teeperature Digital Readout An Omega engineering unit was used to provide a digital readout of the ambient temperature during the test. t 4.0 TEET PEDCD"EI The arpacity test was conducted in two separate but inter-related phases. The first phase consisted of establishinF a base line a=pacity fo'r -the power cables when installed in the unprotected conduit test assembly. ' The secend phase consisted of detertining the a perage derating which occurs wher the conduit test asse:bly is enclosed by a three hcur rated l design cf the THERMD-LAG 330 Fire Barrier .Syster Preshaped Coeduit-Sectices. During both test phases, the ambient temperature was caintained at-40 +/- 2C, and the taxitu: conductor temperatures vere maintained at
.' 90 f/- 2C. These tve test phases are described in ecre detail it the
- f ollowing paragraphs .
i 4.1 Unpre te:ted Cenduit Test Asserb3y Tne bEse line ar;a:d:y tes: vas conducted er the tv: inch conduit test asscri2y prior te enclesure with the protective fire barrier at the laboratory facilities.cf ISI in St. Louis, Missouri on 23 Oct. 1951. The. base 3ine arpacity test was startec by energizing the pove:. sources to produce an initial amperage of.160 seperes in the #00 AWG power cable- , circuit. This acperage level was then maintained in the power. circuit until one of the thermocouple temperatures stabilized within the l
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designated tecperature band of 194 +/- 3T (90 +/- 2C). 'The elapsed time for the pre-test period was circa four hours. Throughout this and the subsequent one hour test phase, the ambient-temperature within the test enclosure ~ was maintained at-104 +/- 3F - , t (40 +/- ' 2C) . . 1 7
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I E, . Once the base line test was initiated, it was continued for one hour. r ' During the test, the amperages in the power cable, the hot spot cable thermocouple temperature, and the ambient temperature, were recorded
. at 5 minute intervals.
The recorded base line emperage of 152 amperes was then corrected to reflect a 40C a=bient temperature test condition and a 90C conductor temperature, using the correction formula presented in IPCEA Pub.
"J' No. P-46-426 (1962), Page Ill, Equation (5). ~ Af ter correction, the base line acperage became 153.52 amperes. . The base line test amperage and temperature, together with the amperage correction >
calculations are shown in Table 1. f 4.2 Protected Conduit Test Asserb]y A three hour fire rated design of the THERMO-LAG 330 Fire Barrier Syste Preshaped Conduit Section was installed on the rvo inch conduit tes: ' asse:bly. Installation of the Systec involved cutting and mo ::i=r 3 foot long preshaped conduit sections on the test assembly, using ap; roved stainless steel tie wires. Tne preshaped conduit section design was installed on the tes assently it accordance with procedures set out in TSI's Technical Note 20tbi entitled:
" y,E:r-130 330 Fire Earrier Systen, Installation Procedures Manual, t;uclear Plan: Applications", Revision 11, April 1984
, The test was started with the current flov established at 155 acreres in the power cable circuit. This current level, which was develtped i: the first phase, was maintained until the te=perature limit of 191T (9 c) was reathei by the hettes: cable therrotouple. At this point, the a=perage was gradually reduced until the bettes cable thercocouple statilized withir the designated terperature band of 194 +/- 3F (90 +/- 2c).
t Afte: the ter:crz ure had statilized f er ene brur, the test run var ir.;;;a:e: ani c:.tinaci f:: are her heur. Durin; the test r u: :: + i circui: a:perage s , the he: spot cable the rtoccu;1e terpe rature att the a:Sier: te perature were recorded at 5 cinute intervals. The test azperage of 140 a peres was then corrected to reflec: a t '. *
- ambient te=perature condition and a 900 conductor temperature tes:
condition using the correction f ormula presented in the IPCLA Pub. No. 46-426 (1962), Page III, Equation (5). Af ter correction, the test. amperage became 138.60 amperes. The - test a=perages and temperatures, together with the amperage condition f actors are shown in Table 2. t 8 l
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BASE LINE TEST DATA a,3
- Average Ambient Maximum Cable Temperature Temperature f00 AWG Power Cable Time F F Acserage 3:00 PM 106 194 152
+
3:05 PM 106 194 15: 3:10 PM 105 194 152 3:15 PM 105 193 '15: 3:20 PM 105 193 15: 3:25 FM 105 193 15: 3:30 PM 105 193 15 3:35 PM 104 193 152 3: 40 PM 105 193 152 3:45 PM 105 193 152 3:50 PM 104 193 IS:
.,l 3:55 Ps: 104 193 . 15:
4: 00 PM 104 193 15: 4: 05 PM 104 193 15; Average A.tient Te:perature: 104.79F (40.44C) Averart CaiIt Ter; e rat t:re : 293.21F (E9.56C) iet; era:ure Cerrelation Per IPCTJ. Pub. Ec. P-46-426: I = 152 90 - 40
- 21. 5 4 89.50 89.56 - 40.44 23 .5 + 90 1 = 152 (1.03 ) = 153.52 Amperes 9
g, Ile u . h i TABLE 2 TEST DATA FOR A FIVE FOOT LENGTH OF WO INCH CONDUIT PROTECTED WITH A THRIE HOUR FIRE RATED DESIGN OF THE THERMO-LAC 330 FIRE BARRIER SYSTEM Average Ambient Maximum Cable Teeperature Temperature FO: AVC Power Cable F F A=perare Tiee 105 197 140 11:06 AM 105 196 140 11:11 AM 105 196 140 11:16 Av. 105 196 140 11:21 AM 105 197 140 11:26 M: 105 197 140 11:31 M: 105 197 140 11:36 /e: 105 197 140 11: 41 c: 105 197 140 11:46 M: 105 197 140 11:51 AM 105 197 140 11:56 M: 105 197 140
/ 12:01 Pv.
105 197 140 12:0C PM Average A-tien: Te perature: 105T (40.5s ? Avu s p+ Cstle Terperaturc: 196.797 (E.fi: Te perature Correlation Per IPCEA Pub. Ec. P-46-426: 1 = 140 90 - 40 234.5
- 91.55 91.55 - 40.k 234.5 + 90 I = 140 (0.99) = 13E.60 A= peres A=pacity Derating = 153.52 - 138.60/153.52 x 100 - 9.72%
- 10
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p 5.0 ANA1,YSIS OF TEST RESULTS
.n 4 '
' The hottest cableL thermocouple temperature, together with the ambient
- temperatures' and power cable amperage readings, were recorded at 5 minute intervals during each of the -test phases. .These test'results, whichr are shown in Tables 1 and 2, are analyzed and discussed in the.
following paragraphs, e 5.1 Unprotected Conduit Test Assembly e- . ,
.i i The temperature readings for the hot spot thermocouple remained within' 3 the '194 +/- 3F (90 +/- 2C) temperature range durinE the one hour test -
7-period. The temperature-ranged between-1c: and 194T during the test. 4 The powe'r. cable current' remained constant at 152 asperes'throughout
~
the one hour test. The ambient temperature vittin the test enclosure. average 104.79T'vith all temperature readings' falling within the . prescribed test' range of 104.+/- 3F (40 +/- 20) during the test. r f 5.2 Protected Conduit Test'Asse:bly ; The.terperature reading for the hottest thereccouple rose te 191T (90C)~ , when the power cable' circuit was energized at the 155.a=perages level- 'i established in the base line test. The po st cable current was then !
/ reduced te 140 a= peres and the-te:peratu're.readingsEfrot this thermbcouple stabilized between 196 and 197Tl prior to the start of the tes-The pover cable current re=2ined 'at' 140 arperes throughout the one hour.
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test. The ambient te perature with the tes: cha ber averaged-105T.vithin d the prescribed t est rar.ge of 10; +/- 3T-(41 - - 2C) during the' test. l i d 11 .
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6.0 CONCLUSION
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- 7 The test results indicate that the ampacity of three lengths of #00 AWG i
power cable installed in a two inch diameter rigid steelf conduit, should' '
'4 [ fire berated derated design ofby the9.72%
THERMO-LAGwhen 330the conduit Fire Barrier is Preshaped System protected with la;
<. Conduit Section. t
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This derating f actor was calculated by subtracting the- test arpacity of 138.60 a= peres from the base line amperage of 153.52, dividing the base' . line value of 153.52, and then multiplying by 100. On this basis, the t
~ derating f actor was determined to be 9.721.
r The derating f actor applies to the th ekness of the THERMO-LAG'330 Fire l
- Barrier Syste thterial as tested, ar.d tolerances employed in this test progra which was 1.250" +/- 0.25C", do .
The test results obtained for derating the #00 AVG power cable cay be i used f or all sizes of cable with similar material. This is based on
'I J. Stelpe's work which indicates tha: derating should be independent of cable size.
ll O 1-b 4 12
w 1 g* , v o G J ADDENDA { r
' Recent IEEE draft bulletins for a=pacity derating tests suggest the use of raceway sections larger than the 5 foot section used for this test. Since the y
base line test was conducted in October of 1981, the IEEE raceway length could ~ s. not be anticipated. Bovever, the 5 foot raceway used in this test will not in any way invalidate the test results. The length of the raceway vill affect two parameters;
- 1) The temperature oscillations it both the cable conductor and the the surrounding ambient air ir the test box.
. 2) End effects where the calle enters and exits the test box.
Each of these para =eters vill be considered below:
- 1) Te:perature Oscillations The temperature oscillations are a function (among other things) of the air voluze between the raceway and the test box, and the total area of fire barriers on the raceway - both of which are a linear function of the raceway length. During the tests, the te=perature variations for both the conductor terperature and the a bient test box temperature vere vc11 within the allowable +/- 2C during the one hour test period. In addition, the average value for conductor terperature and test box actient te perature vere ner:21ized to the base 90C/40C using the
' current correction foredla gtven in IPCEA Publication No. P-46-426 (1962) on page III, equatien (5) .,
- 2) End Effects A s'r:rt raceway vil2 be vulntrai2e tt end effe:ts whic? are caused by the localized het spces whcre the raceway erters and exits the test b:x. These het spots are caused by the cera:ic fiber packinE, and are typically in the range cf 5: te:perature rise. The het spots udll
. . cause a temperature Eraitent in both the inward and ourvard direction.
The temperature gradient vil. exist for only several inches into the test box, not enough to effect the test results, since the conductor thermocouple locations are well into the test box. 6 s
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