ansi c80.1 rs conduit

7/28/2019 ANSI C80.1 RS Conduit

1/13

ANSI C80.1-1994

RigidSteelConduit-Zinc CoatedW C )

N a t l o n a lE l e c t r l c r lM a n u f a c t u r e r sA s s o c l a t l o n1300 Nor th 7 thStreetS u i t e 1847R o s s l y n ,i r g i n i a 22209(703) 841 -3200m National Standardth permission of the Americanresale. N o part of this publication,electronic retrieval system orission of the American Nationalreet, New York, N ew York 10036.

-Amflas$ndard

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2/13

ANSI" C80.1-1994

American National Standardfor Rigid Steel Condu it-Zinc Co ated (GRC)

SecretariatNational Electrical Manufacturers Association

ApprovedAmerican National Standards Institution, Inc.

AbstractThis standard has been developed to specify dimensions and weights for zinc-coated rigid steel conduit,elbows,couplingsandnipples for useasanelectricalraceway.Trade size designators metricsizedesignators) range from 1/2 (16 GRC) to 6 (155 GRC). Basic data for threads are ncluded as well asrequisite tests for mechanical propertiesof the conduit and or the zinc coating.

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3/13

American Approvalof anAmericanNationalStandard equiresverificationbyANSI hat herequirements for due process, consensus, and other criteria for approval have beenNational metbyhetandardsdeveloper.Standard Consensussestablishedwhen,n heudgmentof heANSIBoard of StandardsReview, substantial agreement has been reached by directly and materially affectedinterests. Substantial agreement means much more than a simple majority, but notnecessarily unanimity. Consensus requires that all views and objections be considered,and that a concerted effort be made toward their resolution.The use of American National Standards is completely voluntary; their existence doesnot in any respect preclude anyone, whether he has approved the standards or not,frommanufacturing,marketing,urchasing,rsingroducts,rocesses,rprocedures not conforming to the standards.The American National Standards Institute does not develop standards and will n nocircumstances give an interpretation of any American National Standard. Moreover, nopersonshallhavetherightorauthorityto ssuean nterpretation of anAmericanNational Standard in the name of the American National Standards Institute. Requestsfor nterpretations should be addressed to the secretariat or sponsor whose nameappears on the title page of this standard.CAUTION NOTICE: This American National Standard may be revised or withdrawn atany time. The procedures of the American National Standards nstitute require thataction be taken to reaffirm, revise, or withdraw this standard no later than five yearsfrom the date of approval. Purchasers of American National Standards may receivecurrentnformationonallstandardsbycallingorwritingheAmericanNationalStandards Institute.

Published byNational Electrical Manufacturers Association1300N. 17th Street, Rosslyn, Virginia 2209

CopyrightO 1995by American National Standards Institute, Inc.All rights reserved.Nopartof this publication may be reproducedn anyform, in an electronic retrieval system or otherwise,without the prior written permissionf the publisher.

Printed in the United States f AmericaAPS5C291I 2




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4/13

ContentsPAGEForeword ......................................................................................................................................................... i1 Scope .................................................................................................................................................. 1

2 Normativeeferences ........................................................................................................................... 13efinitions ............................................................................................................................................. 15 Generalequirements .......................................................................................................................... 14Units of measurements........................................................................................................................ 15.1Circularcrosssection ................................................................................................................ 15.2 Wall thickness ............................................................................................................................ 15.3 nterior surface ........................................................................................................................... 2

5.4 Welding...................................................................................................................................... 25.5Cleaning ..................................................................................................................................... 26Detailedequirements .......................................................................................................................... 2

6.2 Enamel or equivalent coating .................................................................................................... 26.4 dentification ............................................................................................................................... 26.5Dimensions ................................................................................................................................ 26.6Threads ...................................................................................................................................... 26.8 Elbows, bends and nipples ....................................................................................................... 3

7 Testprocedures ................................................................................................................................... 37.1 Bendingproperties .................................................................................................................... 37.3 Quality of enamel coating for use on interior surfaces............................................................ 48Examination of product ........................................................................................................................ 48.1 Placeof inspection.................................................................................................................... 48.2Visual nspection ........................................................................................................................ 48.3 Restrictions on ocalized surface mperfections ........................................................................ 48.4Retests ....................................................................................................................................... 4

9 Marking................................................................................................................................................ 4

5.6Protectivecoating ...................................................................................................................... 26.1Zinccoating ............................................................................................................................... 26.3 Threading and chamfering ........................................................................................................ 2

6.7Couplings ................................................................................................................................... 2

7.2 Thickness of zinc coating .......................................................................................................... 3

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5/13

ANSI C80.1-1994

Foreword (This Foreword is not part of American National Standard C80.6-1994)This standard was developed by the Accredited Standards Committee on Raceways for Electrical WiringSystems, C80. The objective of the committee s to produce a comprehensive specification that wouldestablishuniformdimensionsandstandardconstruction equirements or igidmetalconduit,electricalmetallic tubing, intermediate metal conduit and rigid aluminum conduit raceway products and their associatedcomponents.The standard was originally approvedn 1950 and revised in 1953, 1959, 1963, 1966, 1977, 1983 and 1990.Suggestions for improvementof this standard will be welcome. They should be sent to the National ElectricalManufacturers Association,1300N. 17th Street, Rosslyn, Virginia22209.This standard was processed and approved for submittalo ANSI by the Accredited Standards Cornmittee onRaceways for Electrical Wiring Systems, C80. Committee approval of the standard does not necessarilyimply that all committee members voted for ts approval. At the time t approved this standard, the C80Committee had the following members:J. A . Gruber, ChairmanJ . A. Gauthier, SecretaryOrganization RepresentedAluminum AssociationAmerican Iron and Steel InstituteAmerican Pipe Fittings AssociationInternational Association of Electrical InspectorsInternational Brotherhoodof Electrical WorkersNational Electrical Contractors AssociationNational Electrical Manufacturers Association

Telephone GroupUnderwriters Laboratories, Inc.

Name of RepresentativeP.PollakM.PalivodaR.T.BrysonK.R.EdwardsJ .WidenerA.W.BallardC.W.BeileD.GearingJ .A.GruberJ .H.KuczkaT.McNeiveS.SchauffeleR.Higgenbottom (Alt.)P.Horton (Alt.)R.J azowski (Alt.)F.W.McGeehanG.RusinskiR.LaRocca (Alt.)

W.Lilly

C.H.Williams

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6/13

AMERICAN NATIONAL STANDARD ANslm.1-1994American National Standardor Rigid S t e e l Conduit-Zinc Coated (GRC)1 scope

The following standards contain provisions which, through r e f e r e n c e in this text, constitute provisions of thisAmerican National Standard.At the time of publication, the editions indicated were valid. All standards aresubject to revision, and parties to agreements basedon hs Amerimn National standardare encouraged toinvestigatethepossibinityof applyingthe most recenteditions of thestandards ndicatedbebw.ANSVASME B1.20.1-1983 (R1992),P@ 7 7 ~ ~ ~ 3 ,e t ~ d R ~ ~ ( k h )3 Definitions3.1 Threaded couplingA threaded cwpling or rigid steelconduit is an internaythreaded steelcylinder fo r oonnectngtwo sections oirigid steel conduit.

3.3 NippleA nipple is a straight section of rigid steelconduitthreaded on each end.4 Units of measurementThe values states in inchpoond units are to be regarded as the standard.The metric equivalents may beapproximate.5 G e n e r a l requirements5.1 Cirwkrcrosssect ionRigid steel cmduit shall have a circular cross section sufticierrtly accurate to permit the cutting of threads naccordancewith table1.5.2 Wall thicknessThe wall thidmess shall be uniform throughoutexceptf o r localized surface imperfections as permitted in8.3.

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7/13

ANSI C80.1-1994

5.3 InteriorurfaceThe interior surface shall be free from injurious defects.5.4 WeldingThe welding of all seams shall be continuous and done in a workmanlike manner.5.5 CleaningThe conduit shall be adequately cleaned before the application of the protective coating. The cleaningprocess shall leave the exterior and interior surfaces of the conduit in such a condition that the protectivecoating shall be firmly adherent and smooth.5.6 Protectiveoating5.6.1 The exterior surface shall be thoroughly and evenly coated with metallic zinc applied directly to thesurface of the steelo that metal-to-metal contact and galvanic protection against corrosion are provided.5.6.2 The nteriorsurfaceshallbeprotectedby a zinc,enamel,orothersuitablecorrosion-resistantcoating.6 Detailedequirements6.1 ZincoatingThe zinc content of the coating on he outside surface shall be equivalento a minimum thickness of0.0008in. (0.02 mm.)6.2 Enamelor equivalent oatingEnamelorotherequivalentprotectivecoatingshallhaveasmoothcontinuoussurface.Anoccasionalvariation due to uneven flow of coating shall be acceptable. The coating shall not soften at a temperaturef120F (49C) and shall e sufficiently elastic to meet the test describedn7.3.6.3 ThreadingndhamferingEach ength of conduit, nipple, elbow, and bend shall be threaded on both ends, and each end shall bechamfered or otherwise treatedo remove burrs and sharp edges.Threads shall comply with the requirements of.6. If threads are cut after the zinc coating has been applied,the threads shall be treated with a protective coating o prevent corrosion before installation. This treatmentshall not impair electrical continuity through couplings or fittings after installation.6.4 IdentificationEach lengthof conduit, nipple, elbow and bend shalle identified with the manufacturer's name or trademarkand the words, "rigid steel conduit," except that close threaded nipples need not beo identified.6.5 DimensionsThe dimensionsof Intermediate Metal Conduit shall ben accordance with table .6.6 ThreadsThe number of threads per inch (25.4 mm), and the lengthf the threaded portion at each end of each lengthof conduit, nipple, elbow and bend shall beas indicated in table1,and shall conformo ANSVASME B1.20.1-1983 (R1992). The perfect thread shall be tapered for its entire length, and the taper shall be 3/4 in/ft (62.5 Imdm).6.7 CouplingsCouplings shall comply with the following requirements.


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8/13

~

STD.ANSI C B O - 1 - E N G L L774 SB 0724350 0542379 457ANSI C80.1 -1994

6.7.1 The exterior surface of couplings shall be protected by means of a zinc coating, which shall complywithhe equirements of 6.1. Thenterior urface hallbereatedonhibitcorrosionromakingplace prior o installation.6.7.2 Couplings shall be so made that all threads on the conduit will be covered when the coupling spulled tight on standard conduit threads.6.7.3 Both ends of the coupling shall be chamfered to prevent damage to the starting thread.6.7.4 The outsidediameter,ength,pitchdiameter,andchamferdiameterofcouplings shall beasindicated in table .6.7.5 Couplings shall be straight tapped.6.7.6 Each lengthof finished conduit shall have one coupling attached.6.8 Elbows, bends ndnipplesConduit elbows, bends and nipples shall be made of a similar grade of steel to that employed in straightlengths of rigid steel conduit, and shall be treated, coated, threaded, and marked for identification accordingto the applicable requirements for rigid steel conduit (zinc coated). The dimensionsf 90-degree elbows andthe weights of nipples shall be as indicatedn table4.7 Testrocedures7.1 Bendingroperties7.1.1 Ductilityof steelConduit shall be capable of being bent cold into a quarterf a circle around a mandrel, the radius of which isshown in table 4, without developing cracks at any portion and without opening the weld.7.1.2 Ductilityof zinc coating.The protective coatings used on the exterior and interior surfaces of rigid steel conduit shall be sufficientlyelastic to prevent their cracking or flakingffwhena finished sample of rade size designator/2(16GRC) orthe smallest trade size manufactured is tested. Test shall be performed within 1 year after the time ofmanufacture, by bending 1/2 (16GRC) into a half-circle around a mandrel, the radius of which is shown intable 4 or by bending other trade size designators into a quarter-circle around a mandrel, the radiusf whichis shown in table 4.Compliance of trade size designators 1/2 (16 GRC) and 3/4 (21 GRC) shall be determined by bending theconduit with a form as shown in figure.Compliance of trade size designators larger than 3/4 (21 GRC) shallbe determined by bending the conduit with any suitable bending equipment.7.2 Thickness of zinc oatingOne of the following test methods shall be employed for measuring the thickness or extent of the externalzinc coating on conduit:- Magneticest- Preece test (material that will withstand fourminute immersions shall be considered as meeting therequirements of 6.1.



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9/13

ANSI C80.1-1994

"""W

Figure 1-Form forbending tubing4



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10/13

~

STD.ANSI C B O - L - E N G L w t 4 m 0724350 0 5 w m , 9 3 5 nANSI C80.1 -1994

7.3 Quality of enamel coating or use on nterior surfacesTest pieces of uncoated sheet steel, 3 in.(76.2 mm) wide, 5 in.(127.00 mm) long, and 0.010 in.(0.25 mm)thick, shall be cleaned with a suitable solvento remove all grease and foreign material. Each piece shall bedipped into the enamel that is used for coating the conduit and the coated test pieces shall be allowed to air-dry for 30 minutes before being placednthe baking oven. Each piece shall be suspendedy means of shortwires in the baking oven and the samples shall be baked for a period of 5 hours at the normal bakingtemperature for the enamel in question, except that if the normal baking temperature s ess than 275F(135C) or if the enamel is regularly air-dried, the oven temperature shall be maintained at 275F to 302F(1 35C o 150C).At the end of the 5-hour period, the test samples shallbe removed from the oven and allowed to air-cooloroom temperature. Each test piece shall be gripped na vise and then bent from the opposite side back andforth ten times through an angle of 180 degrees, the radius of the bend being 1/16 in. (1.59 mm). When sotested, the enamel coating on the sample shall not crack or flake.8 Inspection8.1 Place of inspectionAll tests and nspections shall be made at the place of manufacture prior to shipment, unless otherwisespecified, and shall beo conducted as not o interfere with normal manufacturing processes.8.2 VisualnspectionEach length of conduit shall be examined visually, both on the exteriorand interior surfaces to determine ifthe product is free from slivers, burrs, scale, or other similar injurious defects, andf coverage of the coatingis complete.8.3Restrictionsonocalized urfacemperfectionsLocalized surface imperfections may not exceed a depthf 12-112%.8.4 RetestsIf any sample tested as prescribed n this specification should fail, two additional samples shall be tested,both of which shall comply with the requirements of this specification.9 Marking9.1 IdentificationEach lengthof conduit, nipple, elbow and bend shall e identified with the manufacturer's namer trademarkand the letters IMC at least 1/8 in.(3 mm) high, except that close threaded nipples need not beo identified.




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11/13

STD-ANSI C B D - 1 - E N G L L774 0 7 2 4 1 5 0 0542402 871ANSI C80.1-1994

Table 1-Dimensions of threads for rigid steel conduit1

TradeSizeDesignator

1123141

1-1141-1122

2-1123

311245

Custom

ThreadsPerln.1414

11-11211-11211-11211-1/288888

Inch-Pou1Pitchdiameterat end ofthreadEo,taper3/4in. per t.

0.75840.96771.21 361.55711.79612.26902.71 953.34063.83754.33445.39076.4461"-LNOTE- Applicable tolerances:

Units

Lengthof Thread(In.)Effective

L,0.530.550.680.710.720.761.141.201.251.301.411.51

OverallL40.780.790.981.o11.O31.o61.571.631 .Ea1.731.841.95

Metric UnitsPitchdiameterat endf

threadE,,Trade Threads taper 62.5Size per25.4 mm. perDesignator meterm.16GRC 14

163.73155GRC136.92429GRC110.09403GRC 97.4731GRC84.8518GRC69.0753GRC 57.633 11-112 53

RC 45.621 11-112 41RC39.550 11-112 35RC 30.8251-112 27RC24.58041 GRC 19.263

Lengthof Thread(mm)Effective4

13.4613.9717.2718.0318.2919.3028.9630.4831.7533.0235.8138.35

Thread length(L4):fl thread, recommended practiceO, 1Pitch diameter: -+1 turn is the maximum variation permitted from the gaging face of the working thread gauges.

Table 2- Dimensions and weightsf rigid steel conduit

Overall14

19.8120.0724.8925.6526.1626.9239.8841.4042.6743.9446.7449.53

IIrade Size Nominal InsideDesignator Diameter(in.)

112

6.0935.0734.0503.570-1123.0902.489 2-122.0831.624-1121.394-114 1 o630.836140.632

Outside Diameter(in.)0.840

I NominalWall*hickness n.1.O501.311.6601.goo2.3752.8753.5004.0004.5005.5636.625

Metric Trade Outside Diameterominal InsideSize Designator16GRC21 GRC27GRC35GRC41 GRC53GRC63GRC78GRC91GRC103GRC129GRC155GRC

Diameter (mm) I (mm)16.1 I 21.321.2

48.31.242.25.433.47.026.7

168.354.8141.328.9114.302.9101.6 90.788.98.573.03.260.32.9

0.1 070.1260.1380.1460.1 930.2050.2150.2450.266

Units

Nominal WallThickness (mm)

2.642.723.203.383.513.714.905.215.462.726.226.76

Minimum Weight fLength Without

Attached(Ib.)ft.and in.) with CouplingsouplingTen Unit Lengths

9'1 1-114"

1745.3'1 o"1313.6'1 o"972.3'10-114831 O'10-114682.610-112"527.0'10-112"332.0'1 1"249.0'1 1"201 o'1 1" 153.0'1 1"105.0'1 -11479.0

Length WithoutCoupling Meters

3.033.033.023.023.023.023.013.013.003.003.003.00

~ Minimum WeightofTen Unit LengthsWith CouplingsAttached (kg)35.8347.6369.4091.17112.95150.60239.05309.63376.944 4 1.W595.85791.67



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12/13

NOTE-Applicable tolerances:Length: f114 n. (6.35mm) (withoutcoupling)Outside Diameter:for trade sizes112 (16RC) through2 (53GRC): M.015 n. (M.38mm)

for trade sizes2-112 63GRC) through4 103GRC: M.025 n. (kO.64 mm)for trade sizes5 (129GRC) and6 (155GRC): kl%

Wall Thickness: See 8.3Table 3-Dimensions of Couplings

Trade SizeDesignator

112341

1-1141-1122

2- 123

3-1/2456

OutsideDMaximum1.0101.2501.5251.8692.1552.6503.2503.8704.5004.8756.0007.200

Minimumaximum1-41/641-31 I322-11322-1/162-1182-312-5113-13/323-33/643-61/644-114

Outside DiameterTrade Size

41.3 25.7 16RC (mm)mm)esignatorMinimumaximum

21 GRC 31.8 41.727GRC 38.7

108 182.955GRC1O052.429GRC 89.323.803GRC86.514.31GRC 84.18.3 78RC81.O2.63GRC54.0 67.33GRC52.4 54.71 GRC51.67.55GRC50.0

NOTES1 Outsidediameterolerances:plus tolerances: no requirementsminus tolerances-

i 3.4311.o11.2671.6121.8522.3272.8063.9314.4315.4946.556

Metric1PitchI

Maximum(mm)20.3525.6832.1840.9447.0459.171.2787.1599.85112.60139.60166.50

>und Unitsmeter

Minimum0.8141.O241.2831.6281.8682.3432.8283.4533.9534.4535.5166.578

ChamfelMinimum (in.)

0.7981.O081.2601.6051 .W2.3202.8003.4253.9254.4255.5196.591

iameterMaximum (in.)

0.8381.O481.3001.6451.8852.3602.8603.4853.9854.4855.5796.651

itsmeter Chamfer Diameter

Minimum

168.9067.4067.10141.7040.2040.10113.9012.4013.10101.209.70 100.4088.527.007.71 72.641.121.8359.948.939.5147.886.867.4541.780.771.3533.022.002.5926.625.60 26.0121 -290.270.68(mm)mm)mm)

Maximuminimum

for trade sizes smaller than-114 35MC): -1164n. (-0.40 m)for trade sizes1-1/4 (35MC) and larger:1%.2 Chamfer angle shall bebetween 1 1 and15degrees.3 Al l couplings shall have straight-tapped threads.


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13/13

r

ANSI C80.1-1994

Table 4 -Dimensions of 90-Degree Elbows and Weights of Nipples per Hundred1

TradeSizeDesignator1123411-1141-11222-11233-112456

4-1125-Y47-1 48-1149-11210-1121315162430

1-1121 -7/822233-1 83-1 433183-5183-314

0.0860.1250.1640.2020.2690.4300.5610.6630.7861.O601.41O

49101114607090115170200

Customary nchP ound Units Metric UnitsMinimum Minimum

CenterofetricengthLenterofRadius totraightadius toMinimum

(in-) End (in.) Lb. Lb. Designator 1 01.60 16RC0.065-112(mm)

Elbows Elbolipples

Conduit Conduitrade Sizeat Each

21GR C27GR C35 GR C41 GR C53GR C63GR C78GR C91 GR C103GR C129GR C' 155GRC

114.30146.05184.15209.55241.30266.70330.20381.O0406.40609.60762.00

NsMinimumStraightLengthLsat Each kgnd (mm) A38.10

0.6405.25 0.481 92.080.3575.730.3012.55 0.254 79.380.1 95 76.200.1 220.800.0920.80 0.074 50.800.0577.63 0.039 38.10.029

les

Bkg0.911a14.084.544.996.3527.2231.7540.8252.1 677.1190.72

NOTE-Each lot of 100 nipples shall weigh not less than the numberf pounds (kilograms) determinedy the formula:W = l O O * ( L A ) - Bwhere:W is the weightof 100 nipples n pounds (kilograms)L is the length f one nipple n inches (millimeters)A is the weightof nipple per inch (25.4 mm)n pounds (kilograms)B is the weight n pounds (kilograms) lostn threading 100 nipples

8

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ansi c80.1 rs conduit

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