ML20215N340

From kanterella
Jump to navigation Jump to search
Rev 5 to Mods & Additions Instruction M&AI-6, Installation of Conduit & Junction Boxes
ML20215N340
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 09/25/1985
From: Cowan L, Rutledge T
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20215N324 List:
References
M&AI-6, NUDOCS 8611050259
Download: ML20215N340 (24)
v • d • e


Text

_ . _ _ _ _ _ _ _ _ _ _ _ _ _ _____. __

, - Sequoyah Nuclear Plart DISTRIBUTION

. . IC Plant Master File

  • IU Plant Supt (Mta) l IC Mech Mtn Supv IC Instr Engr (IM) --

MODIFICATIONS AND ADDITIONS IC Asst Modifications Manager ~

INSTRUCTION IC Elec Mtn Supv (+4WC)

IC Modifications Manager ~~~~'

, IC Asst Elec Mtn Supv M&AI-6 1U R. C. Miles, Modification Mge, W8NP IC Qa Staff Supv lINSTALLATI JUNCTION BOXES IC IU IC IU IC IC N 6 PR Doc Ctrl, 1520 CST 2-C IU . Plant Manager, WBNP NEB, W10C174 C-X NSRS, E7A2-3C-X Prod Planner (EM) (4WC)

Project Manager - Cons t.QCRU Michael Sedlacik (15W)

QC Inspection Fatellite efP 1 Electric f.h ;

?

C; ) . c. r' > ,- j: ;s - ne ,.s , 'h. ,

Prepared By: _

Lynn Cowan .'

Revised By: Terry Rutledge j I Submitted By: _ f)M blfa,1 Supervisor.

evi .: SE? 2 5 GS  !

Date .

Approved By: G- i Plant Manager l Date Approved: SEP 2 5 tons;

{

l The current revision level of this instruction is: 5 .

Reason for current revision (include all temporary change numbers)

Revised to provide clarity The last page of this instruction is Number 21 .

l '

c c, ...<; , ,,.. .s .. .

.a. .c.- .. I-( cy : .. s C.,er sneet r. n . t : i,. '

History of Revleter.

Rev. No. Date Revised Pages Rev. No. Date Revised Panes s 0 31/8/79 All

_ , { ['

1 11/19/81 18 Revised 12,13,16,17, 2 07/08/82 Added 19,20,21 3 11/29/82 11 .

4 08/17/83 15,17,5 18 s SEP 25 G85 Au.

O-' s g M_ -

,.e&+mw .

t e

G I

i

l. emman

~

NN O

l l

l 9 9 i

y-,--.y- - -. - ----+-,

y9y-m, , . . -,w-,yy,, , - w g. .,.-----__w-.. .f. ,,_- --,.,,,----e_._7 ,y ___e-,.ww-ww

. 1 SQ?.;

. , H&AI-6 Page 1 of 1 Rav. 5 l TABLE OF CONTENTS - - - -

4 Page No. -

l 1.0 GENERAL . . . . . . . . . .- .......... .....

1.1 Scope . . ....... ....... . .... .. 1 )

1.2 References . ............. .. ..... I 1.3 Definition . ..................... 1 l.4. Prerequisites. . ................... I 2.0 MATERIALS . . . . . . . . . . . . . . . . . . . . . . . . .

2. I General . . . . . . . . . . . . . . . . . . . . . . .. 2
7. 2 Major or Special Materials . ..... ....... 2 2.3 Miscellaneous Materials . ... . .......... 3 30 INSTALLATION ... . .... . . . . . . . . . . . . .. .

3.1 Cer.eral . . . . . . . . . . . . . . . . . . . . . . . 3-4 f 3.2 CInduit .............. .... ..... 3-12 3.2.1 General . . . . . . . . . . . . . . . . . . . . . . . 4 h

W .. . -

/

/ 3.2.2 Exposed Conduit . ...................

3.2.3 Embedded conduit . .................

5 6-7 3.2.4 Rimid Metal Conduit . ................ 7-8 3.2.4.1 General . . . . . . . . . . . . . . . . . . . . . . 7-9 3.2.4.2 Steel Conduit and Intermediate Metal 9 _

~

Conduit (INC) . . . . . . . . . . . . . . . . . . .

3.2.4.3 Aluminum Conduit . ................ 10 3.2.5 Plastic conduit .................. 11 3.2.6 Flexible conduit . . ........... ... .. 12 3.3 Coiiduit Boxes . . ... ... ............ 12 3.3.1-~~Ceneral . . . ...... ............. 12-13 3.3.2 Painting ... . ... ... ............ 13 3.3.3 Seismic Mountin3 . ..... . . .... . ... . I's 3.3.4 Identification .!arkina . . . . . . . . . . . . . . . 13-14 4.0 INSPECTION REQUIREMENTS ... ... . . . ... . .... 14 ACCEPTION CRITERIA . ........ ........... 15-17 DOCUMENTATION . . . . . . . . . . . . . . . . . . . . . . . 17 APPENDIX A-Exposed Conduit and Junction Box Inspection Sheet 18 FIGURE 1 - Floor Mounted Equipment . . ...... ..... 19

, FIGURE 2 - Mechanical Systems Subject to Novement . ..... 20 1

TABLE 1 - Minimus Bend Radius for Flexible Conduit . .... 21 .

l 1

l

l L

l

._(

c fic.d inste'*-tict cf l 'Ju '.-cr fl>.a. . c ec ' a - -

. .- ec.icred (cr L1- . :t: e. .

Ve.duc 1:. *.allea c:- f .cu.*,

.4ay , .e s : L ; n or cc.,:e t :a '

, i r cc t ..:ure ah 311 t e audreased t, .c c :. : r. ; ;,

l  ;.. References The latest revision of the documents listed below in effect at the time of installation shall be followed.

DS-El.2.2 - Electrical Equipment Nameplates - Sequoyah and Subsequent Nuclear Plants

  • SD-E13.1.1 - Expansion / Contraction Joint for Embedded Aluminum, Inter-mediate Metal, and Steel Conduit SD-E13.1.2 - Expansion and Deflection Fitting for Embedded Aluminum, Intermediate Metal, and Steel Conduit SD-E13.6.3 - Conduit Boxes, Frames, and Cevers SD-E13.6.5 - Conduit Box Connection (Watertight)

SD-E15.3.4 - Conduit, Cable, and Vire Identification Tais (Sequay:,h Nuclear Plant and All Subsequent Nuclear Projects)

C-40 - Installing Electrical Conduit Systems and Conduit Boxes Where specific instructions are lacking on design documents, Office of Engineering (CE) shall be requested to provide the necessary information on a case-by-case basis.

1.3 Definitions Class IE. The safety classification of the electric equipment and .

l systems that are essential to emergency reactor shutdown, containment isolation, reactor core cooling, and containment and reactor heat removal, or otherwise are essential in preventing significant release of radioactive material to the environment.

1.4 Prcrequisites 1.4.1 RVP Areas For installation work that tranverses a radiation arca requiring

~

a radiation work permit (RWP) contact Health Physics (HP). Con-tact ALARA to evaluate ALARA preplanning requirements.

1

t l

\

\

\

t f

-t i

sate Deriocratizer Vaace Ivapcrator aull.:ing e .-i t l

2. l Condenser Cooling Water Pumping Station and Retaining Walls ,

J. Auxiliary Essential Raw Cooling Vater Structures ,

l

4. Diesel-Generator Buildings  ;

'5. CO2 St rage Building

6. Refueling Water Tanks and Pipe Tunnels
7. Class IE Electrical Systems Structures ,

l

8. East and West Steam Yalve Rooms i
9. Essential Raw Cooling Water Pumping Station and Access Cells
10. ERCW Discharge Box 2.0 MATERIALS I 2.1 General i

Materials used in the original installation of the electrical conduit systems and conduit boxes shall be new; shall meet the requirements of i

an approved recognized standard; and shall be compatible with the en-vironment and configuration in which they are to be located. .

2.2 Hajor or Special Materialt Major materials and those of a special nature used in the installation shall be designated on OE detailed design drawings or standard drawings, l described in the electrical bill of material, and requisitioned by personnel in the EEB Equipment Requisition Group.

i I

l l '

O

t

~_

i  ; .::: r c: .nu

'e r .

,'..= * :er i-p .  : r. t ; d in r:ctivi 3.2.c f r. : l i - ei om a r. red ;er use with cene.it jtt::s whica cr . as t:  ;, s ipme n t [roundingconductor.

Liqutd tight flexible metal conduit with a synthetic jacket (similar to the Anacnnda Company, Brass Division, "Sealtite type UA") and connectors (similar to Ideal Industries, Incorporated, "Vap-Oil-Tight" series) shall be used for flexible conduit applications. Other equivalent vendors are O. Z. Gedney's type uag and American Flexible Conduit Co.'s AmerTite Bonded (U. L.).

It shall be permissible to use the following as an alternative.

Pressure tight stainless steel flexible conduit with a convolute core structure (similar to Servicair Company type SS60 series or American Hoa, Incorporated, type NB1-0 series) and connector fittings of compatible ~

materials (available from the respective supplier) may be used for flexible conduit applications inside primary containment and may be used for applications outside containment. Radiation resistant elastomer seals, such as silicon rubber, ethylene-propylene rubber, or other TVA api. roved meterial, shall be used with the connector fittings inside i m.t a i nmen t to raintain lesk-tightness. Either the abcve type cone.it ci the type wit? a closec venve single braid stainless steel jacket o.imilar to Ser.-icair Coepany type SS63 series or American Boa, locarporatte, type N21-a series) may be used. The stainless steel flexthle conduit and appropriate connector fittings shell be installed in accoroance with the manufacturer's instructions, l

l If additional restrictions or limitations are required on miscellaneous m.:terials to be purchased, these shall be so stated on the design drawings.

3.0 INSTALLATION 3.1 General 3.1.1 Installation of conduit, boxes, fittings, and accessories shall conform to the latest edition of the National Electric Code (NEC) and the drawings and standards described in scrtion 1.2. In the event of a conflict between design drawings and NEC, the drawings shall govern.

i

~

~t.: .. 4.

c

. .it .o.a ,-:,.u, tr .r 3.1.5 Materials shall be properly protected while in storage.

3.2 Conduit 3.2.1 General 3.2.1.1 Conduit exposed to the weather, embedded is concrete, -

or in wet locations shall be sloped for drainage, if possible. Embedded conduit systems shall be rigidly ,

supported and braced in position to avoid settlics and i to prevent the formation of pockets if heavy batches of '

_ concrete are placed on the conduit.

3.2.1.2 To terminate a conduit beneath a switchboard or at an apparatus, a bushing, chase nipple, or condulet shall be used unless otherwise defined on design drawings. In certain instances where it may be impossible to install a conduit bushing or chase nipple at each termination point of a conduit because of limited space, the.

conduit end should be smoothed of all burrs and ob-i structions (beveled or rounded to approximately a 1/16" radius) so that cables will not be damaged.

3.2.1.3 After a conduit run is completed, it should be inspected and cleaned out. Compressed air shall be used in ,

blowing out any accumulation of trapped liquid. This pertains to areas in an outside environment or wet locations only.

3.2.1.4 Conduit identification tagging shall accompany the con-l duit installation. The tag shall be as designated on the conduit design drawings and/or conduit schedule and in accordance with electrical standard drawing SD-l E15.3.4

l 2

e n

l ~. '

l .

"~

<. ' - ts fula~i {

l2 ni int-

-t . r. - et.iae

,,sce ; r; a a ci.i ; . l

. Ou: -

3.J.2.1 Exposed conduits shall be run in straight lines paral-1el to column lir.es, walls, or beams. Where conduits are grouped, the bends and fittings shall be installed to present an orderly appearance. Unnecessary bending or crossing shall be avoided.

i 3.2.2.2 Supports for straight runs of exposed rigid metal con-duit shall not exceed the maximum distances listed in the NEC for systema made up with threaded couplings, i

In seismic Category I structures, exposed conduits ,

shall be supported as defined on design documents.  !

(Ref 47A056 series drawings). This also needs to be referenced for conduit runs not mounted directly to walls or ce111 ass.

  • l 3.2.2.3 Malleable iron 1-hoto pipe straps, clamps, U-bolts, hangers, or close bracket-type pipe supports may be used. One pipe backspacer shall be used for the 1-hole

~

malleable iron pipe supports. Care shall be taken to assure the 1-hole prestrap assembly has been properly tightened to prohibit slippage or movement.

3.2.2.4 In nonseismic structures, galvanized steel members may be drilled or punched for conduit supporting bolts provided the holes are immediately coated with zine-dust zine-oxide paint (Tederal Specification TT-P-641d) and galvanized or rust-resisting bolts are used.

Threaded stud bolts, Nelson stud anchors, or. equivalent, may be used instead of drilling or punching steel memb,ers.

3.2.2.5 In moist locations and in locations where appearance is .

of importance, precautions shall be taken, such as by use of strap-type wrenches or equivalent means, to avoid injuring the galvanized coating or surface of stainless steel conduit.

5A-Pa Rev. -

2-inch citicance sh..' 5e : -baalr. ? Ict-u-  :.a :ul t .2 e; dded la pour t cocerete vel!. ar th c slaba, exc- that detail J desito di. .i..a 3.5. 1 be ednered t o adjacent to con bit terdic tic. t, ,

etc., where area is restricted.

Cor.Jaits c.d conduit sleeves, when located la a b uk or arcup form in a wall pour, may be adjusted a4 required i to line up the bottom outside edge of the smaller sized I conduit with the bottom outside edge of the largest conduit in the group in order to continue the group run  !

on a common exposed support. l Likewise, grouped conduits in a floor or ceiling slab may be shifted enough to take advantage of a common

~

I exposed wall or column support. Embedded coeduit runs shall terminate within 11/2 the nominal diameter of the conduit being installed, unless the above esceptions )

apply. --

l Conduits embedded in switchyards and transformer yards shall maintain a 1-inch minimum clearance between con-duits.

~

3.2.3.2 In switchyards and transformer yards all single con-duit or groups of conduits shall be encased in concrete with the outer coverage a minir.us of 2-1/2 inches.

3.2.3.3 Where aluminum or nonsetallic plastic conduits are embedded in concrete, extreme care shall be taken to anchor this conduit so that it will not be floated when the concrete is placed.

3.2.3.4 Embedded conduit shall be rigidly supported to with-stand concrete vibrators or batches of mass concrete placements.

3.2.3.5 In supporting embedded steel, aluminum or plastic con- .

duit, extreme care shall be taken to avoid damsge to the surface of the conduit if welding or brazing is l used near the conduit. In no case shall the conduit be welded or brazed to the support. Nonnetallic plastic I

conduit in duct runs shall not be supported by rein-forcing steel forming closed magnetic loops; preformed plastic epacers shall be used.

O

l l -

w.

s

, r .e 1.;i

, , c. : , i  :.

. . .a . . . c..

. j.4 : ;> , . . . ,. m. .i

, . ':n .: e .

. .: ot a n.s..-tea .s tle:ztea.

ts : - -e 3LC ;3.1.1) #re et: e i e. , : . l .. a ds. 6.... ter cofactuter's ins tri:t ic.: . C, il b e fol-Ic ' in .adlag 3rmnd cennections.

. 2 . .i . All embedded condulta turning out of poured concrete shall terminate with a standard coupling flush with the surface of concrete unless otherwise specified on design drawings. Couplings shall be plugged pending ~

exposed extension.

I 3.2.4 3.2.3.10 In duct runs the metallic conduit shall be grounded at each manhole or handhole by brazing the ground wire to the top of the conduit coupling or by using grounding bushings.

Rigid Metal Conduit 3.2.4.1 General

a. Metallic conduit systems, whether embedded or exposed, shall be installed in accordance with those portions of the NEC ensuring that the sys-tems will be adequately grounded and electrically continuous to function as the equipment grounding conductor. When boxes do not have threaded hubs or bosses (or as in section 3.3.3.3), eenduits shall be securely fastened to bones and cabinets, .

each with a lockout and a bushing inside the box and a locknut outside. The conduits shall be of such length that when the bushings are screwed tight against the ends of the conduits, no ap-preciable space will be left between the bushings and the locknuts. The locknuts shall be sufficiently tightened against the box to avoid hotspots or sparking during fault conditions, but without deforming the box.

. 'T

. . ?-

, d i .

- e .or '. o. 4:. i bc f g :_ , I {r (s i , -

....> u. - -

.1 , ,

. . > <- ,.. .: . , v.cv. .  :( . .. :

<r. >t c ' rete 8 JO!

' 411 '. -i -I'

. . g ' u w. (e. a . , Xcp> r

  • 3ttu -sti: J::-i . criser),

l oc equivalent.

d. Standard-radius field bends or manufacturer's elbows are generally to be used for metal conduits, but special long-radius bends shall be used where-ever specifically called for on the design drawings.

The long-radius bends shall have radii as large as physical conditions will permit, but sever less than seven times the nominal diameter of the con-duit. Short radius elbows shall'be used only where specifically called for on the drawings. -

e. Field bends for rigid metal conduit shall be made such that the internal diameter of the conduit is not materially. changed and the protective coating on the inside and the outside of the conduit is not injured. The bends shall be free of kinks, nicks, necking, splits, indentations, or flattened surfaces. Nest shall not be applied in making any metallic conduit bend. (See section 3.2.5.4 for field bends for nonnetallic conduit.)

O O

SQNP

. M&AI-6 Page 9 of 17 Rev. 5 3.2.4.1 Continued  ;- --

f. Motor control centers with conduits that are'

, greater than 3 feet in length require conduit Tu~p~~ ~

ports as shown on mechanical seismic support drawings (47A series) for conduit or as specified on structural . teel drawings. For these longer runs, a length of flexible conduit is required as ,

noted on conduit drawings.

The individual panels in some boards have large openings on the top that do not permit the use of locknuts for attaching conduits to the panel.

P1001A or P1000 Unistrut bolted to panel strue-tural members suy be used as a point of attacha nt for conduits.

Conduits entering the top of electrical bosrds in Class I buildings shall not be installed in a man- 1 ner that results in a rigid tie between the top of the board and the cable trays or the building. The materials, bolts, etc., used shall conform to the I.

requirements listed on mechanical drawings 47A056 ,1.-

3.2.4.2 ~ Steel Conduit and Intermediate Metal Conduit (IMC)

Steel and IMC conduit joints and connections shall be made water tight and rustproof by means of the appli-  !

cation of a thread compound which will not insulate t' the joint. Each field-cut thread shall be cleaned to l:

remove the cutting oil before the compound is applied. l:

An electrically conductive and antiseize compound for  !

eetal surfaces such as Kopr-Shield (available Ircs j Thomas and Betts Company), shall be applied  !

to only the male conduit threads to prevent the obstruc- l tion of the raceway. l-

! l

_________----d

SQNP  !

H&AI-6 l

Page 10 of 17 l Bev. 5 l 3.2.4.3 Aluminum Conduit s __.

s. Rigid aluminum conduit installed outdoors or 'in "

wet locations shall preferably be provided with-' ~~~ '

aluminum fittings and supports. Calv.inized fittings and supports may be used in special cases. Care s. .c be taken to prevent the contact of aluminum conduit with corrosive materf ala in places where moisture can accumulate.

5 Strap-type wrecches or equival ct shall *e u : !

(t cvoid scratcping and yoL3tn2 C h e t i t.* f in/s a

COsa :J a i ! ,

c. A li.c i n u;- condutt jaints at ecuplinae oc fi t tir.;s tena ;c seize unlea. treated. Use a c.~.cric,1 compound such sa Aloca Thre.d Lubricant. Ssti.a-factory mixtures such as zine dust and vaseline (50-50 by weight), or a heavy cup grease contain-ing 25 percent graphite may be used. Aluminum threads shall not be coated with red lead or other lead compounds.
d. Standard benders may be used for al == conduit I

except that Dff benders shall be used for conduit 1 inch and below. Use an DfT bender I/4-inch larger than the conduit size, i.e., 1-1/4 inches

, for 1-inch rigid, I inch for 3/4-inch rigid.

e. Aluminum conduit shall be grounded by inserting a salvanized steel coupling in the run, brazing the ground wire to the top of the coupling, and care-fully coating the joint with asphaltua. The

, design drawings will show grounding when used for a single phase of a 3 phase circuit.

f. Rigid steel conduit and associated fittings may be used as a substitute for aluminum conduit and fittings, with the exception of those used for tie-in purposes.

3 Aluminum conduit, conduit fittings, or components .

shall not be used inside the reactor building primary containment.

l

.7 14

  • 1 1

I ri- =

v :m e -

da. - s..- . .u- ; .e ice,. .- m o e :. i . :. Jras-i. ..

l 3.2.5.3 Plastic conduit may be cut with a hacksaw. After l cutting, ends shall be trimmed and rough edges -

smoothed. Area to be asivent welded (outside of conduit and inside of' coupling or fitting) shall be free from dust, dirt, grease, and moisture.

Use methyl ethyl ketone (MEK) for cleaning. -

Polyvinyl chloride (PVC) solvent shall be brushed liberally on the end of the conduit and inside the fitting or coupling when making a joint. After fitting has been pushed on, it should be twisted one-fourth turn to spread the solvent evenly.

Continue to hold joint for 15 seconds so that conduit does not push out of fitting.

3.2.5.4 Bends for noneetallic conduit are usually pur-chased as required for the conduit system but for special cases may be made in the field. Extreme caution should be observed when any source of heat is near plastic conduit. Field becding can be accomplished by the use of a " hot air-cold air" .

blower; a hand-type dryer is recommended by the manufacturers.

4

( .- .

. 57

. H:, ! - -

~

?: : ..

, ?c". 3 '

-~~.~.

11 te used to interf :: the :!-

~~~~~~'

i i eluctric equip.ent and co ,

.- .Sc :e are subject to thermal cove or - 3:iveic considerations must be takra in; acc ,

.a determined by Cog cant Engineer. Flc 41. :

coe . shall allow for relative displacement of Cla e IE equipvent or components'and a rigid conduit systen. <

After installation, the flexible conduit should not be tight or stretched between couplings or fittings. Fittings ~

used on flexible conduit shall be installed per the manufacturers' instructions.

3.2.6.1 Flexible conduit connected to floor mounted equipment shall be installed in accordance with the requirmnents stated in Figure 1.

3.2.6.2 Flexible conduit connected to mechanical systems subject to movement shall be installed in accordance with the requirements stated in Figure 2. The cognizant engineer shall also verify through OE the minimum lengths in Figure 2 are sufficient.

3.2.6.3 Follow dimensions given in Table 1 for deter-mining the bend radius for flexible conduit for equipment in section 3.2.6.1 above and drawing 47A056-89 for equipment in section 3.2.6.2 above.

3.2.6.4 Icstall flexible conduit between flush and recessed lighting fixtures to rigid conduit systems when so indicated on design drawings.

3.216.5 Flexible conduit shall be installed in lengths not exceeding 6 feet, except as noted in design drawings, and located as near the equipment and components as practical. The conduit shall be prepared, assembled, and installed in accordance with manufacturer's instructions, including any torquing requirements, where applicable. .

3.3 Conduit Boxes ,

3.3.1 General l

l 3.3.1.1 Where large boxes are embedded, they shall be properly braced on the inside so that cancrete placement will not deflect them. Threaded holes in box frames shall be protected from injury. #

3.S.I.2 Outlet boxes in architectural tile or easonry unit walls shall be installed strictly in accordance with design drawings and for best appearance.

~

(

1

. t

. . cm

  • c J t. : D boxes ' , ~; -

S c .i . 1::: ,

- - - 0 t

,u .

,,3 u c.'.f ri

( . ve tij 1 .. res t i . ith 02.

d.  :.ntu p<c ,

el fi n i equip- ,

, , cc uru' ' . E' -ent .- accured '-

.te:t viin, g w sc 1 :. . i. t u r a l .

4L 1 1 C. . L e ', to the d rc ,'.J ia ; teatt,, w h e's is . ..te- .n tne <.116d desi m or -te s ., by braria$

the ;rc+ -inj cv.te to the equipment and thea carefu1D/

coating tne joint with asphaltum, or equivalent.

3.3.1.5 For general information and fleid fabbing details concerning boxes, see electrical standard drawing SD-E13.6.3 series.

3.3.2 Painting i

Field fabricated surface mounted boxes shall be painted, inside and outside, immediately after fabrication. Field fabricated I')~

1 flush mounted boxes shall be painted on the inside and the ~

l exposed parts only. Primer paints shall be lead free. Zine I chromate primer (Federal Specification TT-P-57 Type II) is recommended for black sheet steel. Finish coats for exposed I parts shall harmonize with the general painting scheme about ,

the plant. '

l 3.3.3 Scismic Mounting Surface-mounted conduit boxes located in seismic Category I structures shall be seismically mounted. Where the mounting surface is poured concrete, boxes shall be attached to embedded steel plates or mounted to the concrete with bolt anchors as shown on equipment seismic support design drawings of the l respective design project. Seismic mounting of flush or 3 surface boxes to masonry walls shall be in accordance with specific design details.

3.3.4 Identification Marking .

Junction boxes and/or pull boxes which are assigned junction box numbers and nameplate numbers on design drawings shall be i

identified by attaching the respective nameplate to its box as described in electrical standard drawing DS-El.2.2 and its attachments. It shall be permissible to use 3M Scotch pressure-sensitive fos = t pes for attaching nameplates.

l l

O

- - . , - , _..---,.,-,-,-,,__--__,-----,n - - - - - , , . - . , - - , . , , . _._,,,.__,,,---c.,-,-n , - - -- - y_

.e ,

8

..c. .  :,

~ . i u . ., c t s. , ,

e.

j

  1. 'Mn 12 " t uxit.c:r or M

' ' '# 7,-ain ,

r e p r e . c . . : , ; , ....

Installed conduit systems and conduit boxes shall be inspected for the following:

A. Size, type, and location -

i B. Identification C. Grounds D. Conduit fittings E. Flexible conduit installation F. Rurra and sharp edges at terminations

G. Physical separation H. Conduit hangers I. Conduit terminations J. Straps properly tightened NOTE:

Conduit box size, type, and location (where applicable) shall be verified and documented when inspection is perfonned on each conduit which terminates in the box.

l

SQHP

, M&Al-:

Page 15 of 17 Rev. 5 Arceptance Criteria A. Size, type, sad location shall conform to the OE approved drawing in the '

workplan. , -* ~ ~ *

. NOTE: Rigid steel conduit may be substituted for aluminum conduit in the event of a shortage of aluminus ,nduit, if care is exercised in the selection of supports. -

8. Identification Conduit shall be tagged per TVA Standard Drawing SD-E-15.3.4 of General i

l Construction Specification G-40. Conduit boxes shall be labeled with the assigned nameplate and junction box (identifica*. ion nueber JE) specifi:t ca the applicable OE drawing. Vnen no nameplate is assigned, the box shall be identified by the specified JB number. Naa 31stcs vill be installed in acccrdance vi th TVA Standa rd Drawin2 SD-El..' .2.

NOTE: Temporary identification methods for conduit boxes are authorized pending receipt of permanent labels.

C. Grounds

1. Conduit shall be grounded at least once by one of the following:

I

a. Securing to building steel or embedded plate;
b. Securing to a grcunded conduit support;
s. Scruring to a grounded junction box;
d. Use of U-bolt grounding clasps, arcanding stet.ps, or s t our:di n ?

bushing secured to a ground conductor.

2. Conduit boxes shall be grounded at least once by one of the following:
a. Securing to a building steel or embedded plate;
b. Securing to a grounded conduit (If a conduit is used to ground a conduit box, the box shall not be used as a ground for any of the other conduits terminating in it);
c. Using a Kearney stud connector or compression lug, and botting an external ground to the box.

NOTE: Cable tray grounds may be used as a grounding connection when no other means are available.

l l

l u .. . . _ _ _ _ _ . . _ _ _ . _ _ _ - -

.m_.. .__ -- _ _ _ _ -_ -_- _ _ _ ___ _ _

e

=

r r*,JA: L .

'N

' . . i .' Bi Cc w i l?s . .:

. . 3 -

  • ys ! .e dfh- -23. The be,N reGice fer [lexife J n,m: ,rc.oni:si equipment shall be per drawing 47A056-89

.end to finor mounted cluipment per Table 1A of this instruction.

2. The end points of flexible conduit may be left free to facilitate cable pulling activities. Proper termination of the flexible conduit shall be verified after the cable is pulled.
3. Flexible conduit to floor mounted equipment shall meet requirements of Figure 1.
4. Flexible conduit to mechanical systems subject to thermal movement shall meet the requirements of Figure 2.

F. Burrs and Sharp Edges Conduit and conduit boxes shall be free from burrs, cuts, sharp edges, rough suriarcs, or any other defects that may be detrimental to the esble jacket, e . Physical Separation i

f or.d u i t a r. -! c c - .it !cies shall conf ero to the ph :ce I s e pa ra t i c r. reqLire-rnents specifit- < n M .it esin, s . e H. Conduit flangers

1. i In seismic Class I building, hangers shall be spaced per 47A056 <

1 typicals or applicable design approved drawings. l i

2. Four inch or smaller 1-hole pipe straps and 4-inch or smaller conduit boxes, shall be installed in accordance with the requirements of )

i drawings 47A056-2 and -76, respectively. Inspection shall be ac-l complished with the related conduit and documented by the inspector's  ;

signature and date on the inspection sheet.

l l

1 I

e-w----e----.----ee e- me-evw-.-----e----w------.-----we,.- ...w-----e,-w.-e-P'-* -F--ww--w--===#'Neve--y e"'"W*e'*ew e' NWW+'Twwew , -e - we weer a w w w een w e, a w w ww e. e we- ww w % w.mi e. r e-w ee-ww- w-ewee e ey

SQNP

. , M&AI-6 Fase 17 of 17 Rev. 5

3. In non-seismic areas, conduit supports shall be spaced in accordance ':

with the National Electric Code (NEC) and documented by the inspector's signature and date on the inspection sheet. * ~~

Tcemination

  • Cend.t te rminc t l . x l a e condt. i t t a x o r c3 51 ne t .4 e cet he - -

thre ' hubs er t ase4 s!:all ec eecureo u.t..<

  • h ei '

et t r. . 6 ashin:

on te e .. side s'.6 e icc\nat on tre cutale:. in set . call . conduit -

nubs 5e used.

NOTF If there is ina..ffictec space f- n e tc, .. din.:n, e c ..-

duit ends :.uy be roune.N t, . ppt- u ar' , ,1 c h r . .: 1u s.

2. A bushing or chase nipple shc11 'e installe: ut 4 ce ocU. ter-in-1 ates beneath a cabinet or bcara.

.1 Straps Properly Tightened

\ 1.

Bolts without washers shall abov no visible evidence of slack and the bolt shall be verified to be, as a minimum, handtight.

2. Bolts with flat washers shall be verified to be, as a minimum, ~

hat.jtight and the washer shall exhibit no ability to be turned by hand twisting.

IDocumentation 3. Bolts with lockwashers shall exhibit lockwashers.

Conditions cacountered that were not anticipated and any D?,, TCRs, design devi>tions, etc. shall be recorded in the "Remarka" section of the inspection aheet. This inspection shall be documented on the inspection sheet as shown on Attachment A or by vignature in the work instructions of the workplan.

The identification of the conduit boxes included in this inspec' tion shall be re-corded in the " Remarks" section of the inspection sheet or near the signoff in the work instructions.

(

I l

]

I SQNP l ,'t&Al-6 Appendix A Page 1 of 1 Rev. 5.

a (1) QA Inspector required on CSSC equipment only. Signature and date required l EXPOSTD CONDUIT AND JUNCTION BOX INSPECTl' I

i Ref. Drawings:

l Conduit # -

or -

J-Box #

Acceptable Size, Type, Location

( Routing D Correct Coupling 1 -

Identified Properly Burrs, Sharp Edges Removed Separation Requirements Het Hanger Spacing Acceptable l Straps Properly Tightened Conduit Properly Grounded Remarks:

l l

1 -

i i j .

. 'l l '

il

e e

  • e,

,. s e. c- at. r,.

, cin. cc- ' -

,j.

I I'

j

,,- , . 4 14* .tr.t v 'ea c.. Jf

.i; : e t. a -

  • l . es ted fitsin;e cer A t f]7 h u,'

' ', 8 g sc.a.. ,. l g.. set.s ea (s.;Itrin g gs, a oy .

, _ .. --- . - . i 1 T ra * :sts / hr: ql g . .' '.'

. , - ) / h . . g,

' f 23 of '!?ar NisattJ

.. s. ..s

.) *' I83 8# I k3P redatf3 CIall II r C .;- '

Clain II e m paat -

equ p it .. _y -

1 * -'

4 1112 Le, 0.tiggi g oliefmsat -

NOTES:

1. When conduits connect to the top of floor mounted, Class IE equipment, an 18-inch minimum length of flexible conduit shall be used to connect between the rigid conduit and the equipment. As a general rule, the flestble conduit installation should contain enough slack to form a mis:imum 1-inch loop at midpoint between couplings, or to permit dia.-

plarcment of a minimum I-inch between center lines of couplings.

Maximum length of flexible conduit is 72" except as noted on design drawings.

2. Whesi conduits connect to the bottom of floor mounted Class IE equip-s3en t , such as control panels, the minimum length of flexible conduit should be 18 inches, but may be less where physical limitations prevent or make it impractical.

l l 3. When conduits connected to the sides'of floor mounted, Class IE equipment such as motors, the flexible conduit shall, as a minimum, be l long enough to accomodate its minimum bend radius given in Table IA.

4. Conduit connections to cable trays should be avoided; however, if conduits are connected to scismic Category I calste traya, an 18-inch minimum length of flexible conduit sha!! be installed as in Note I i

ahnve.

I l

i . -

I ,. -_. .. . - _ _ _ - _ _ _ _ _ _ _ , , _ . , _ . _ . , . . .__

l l

  • . - l

. ~ '

Ft. ~

Pia- 1 Rev. '

s.

c.;
;

d.a e i C.r'. SYSTLh3 SUBJiCi TO h0Vi.hle;1

.se:* 2 siete 2 note # , , l ew i l

  • 1 i n I

. I e I

qql

b. s % . *.a t e i l'
  • 1, l

12 4*.;.

I i

i

. i . . ie i ,e,,e . , g=i. i <

p)g yi_.

i

.?,Il _

a

'h u. ., o.l.,

$* * * :; :i, reve e91 g.:6 Pavement l

j of pipe

[ , \.,

++

C **i C 3 g s f,e, g g al1PtitPt';f .

INOTES:

1. The minimum lenzth of exposed flexible conduit between couplings shall be as specified in the table below for the size conduit being used.

Dimensions Flexible Metal Minimum Length Minimum Offset Conduit--Nominal (Exposed Between Loop or ID Size (Inches) (Note 1) Couplinas) Displacement 1/2 18 4.5 3/4 24 6 1 30 7.5 1-1/2 32 8 - '

2 36 9 2-1/2 48 12 3 60 15 4 72 (+2, -0 Tolerance) ,

18

2. The minimum loop, offset or displacement dimension shall be as  ;

specified in the above table. - '

3. Refer to dwg 47A056-89 for bend radius dimensions. 1 I

y ._

000937 -

1339

. SQNP MEAI-6 Table 1 Page 1 c( t Bev. 5 i ,

T4ct- 4 j r . - . >e

. uu :.'s F. a FL :t , ccc

.c, .r . - , . ,

Minimum Bendinz Radius (Inches)

Stainless Steel Flexible Metal Liquidtight Flexible With Flexible --

Conduit--Nominal Synthetic Jacket--Minimus Minimum Centerline ID Size (Inches) Inside Bend Radius (Note 1) Bend Radius (Note 1) 1/2 3.5 3 3/4 5 5 1 6 6.5 1-1/2 6.5 9.5 2 7 11  !

2-1/2 9.5 12.5  !

3 11.5 14.5 - l 4 14- 22 5 20 29 l 6 30 35

. ic t s . 1. Plu. .t!..te4 for .tr 1,bt t u ,, 4. c i n . .u . d .t t'- cl . !

cer.r,e c t c r i a ) .

8. To mechanical equipment subject to thermal movement; refer to drawing 47A056-89.

i I 4 i

O 1

. - . . -..-_ -. _ - . - _ _ _ _ ._ __ _-. . . . . . - - . _ _ _ , -

Retrieved from "https://kanterella.com/w/index.php?title=ML20215N340&oldid=3233125"