ANSI C80.

5-1994

Aluminum
ßiaid
Conduit-

N a t i o n aE l lectrical
M a n u f a c t u r e r sA s s o c i a t i o n
1 3 0 0 N. 1 7 t h S t r e e t
Suite 1847
R o s s l y nV, i r g i n i a 22209
lerican National
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Id Street, New York, New York 10036.

LAmerican National Standard

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 S T D - A N S I C B O * S - E N G L 1771.I 07241500538275

ANSI" C80.5-1994

American National Standard

Aluminum Rigid Conduit-

(ARC)

Secretariat
National Electrical Manufacturers Association

Approved May 1995

American National Standards Institution, Inc.

Abstract
Thisstandardhas been developed to specify dimensionsandweights for AluminumRigidConduit,
elbows,couplingsandnipplesfor use as an electrical raceway.Trade size designators(metric size
designators) range from 1/2 (16 ARC) to 6 (155 ARC). Basic data for threads are included as well as
requisite tests formechanical properties of the conduit.

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or using products, processes,or
procedures not conforming to the standards.

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National Standard in the name of the American National Standards Institute. Requests
for interpretations should be addressed to the secretariat or sponsor whose name
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CAUTION NOTICE: This American National Standardmay be revised orwithdrawn at

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Published by

National Electrical Manufacturers Association

1300 N. 17th Street, Rosslyn, Virginia 22209

Copyright O 1996 by American National Standards Institute, Inc.

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 Contents
PAGE
.......................................................................................................................................................... i
Scope .................................................................................................................................................. 1
Normative references........................................................................................................................... 1
Definitions ............................................................................................................................................. 1
3.1 Threadedcoupling ..................................................................................................................... 1
3.2 Nipple ......................................................................................................................................... 1
Units of measurements ........................................................................................................................ 1
General requirements ........................................................................................................................... 1
5.1 Circularcrosssection ................................................................................................................ 1
5.2Wall thickness ............................................................................................................................ 1
5.3 Interiorsurface ........................................................................................................................... 1
5.4 Alloy ........................................................................................................................................... 2
Detailed requirements.......................................................................................................................... 2
6.1 Threadingandchamfering ........................................................................................................ 2
6.2 Identification............................................................................................................................... 2
6.3 Dimensions................................................................................................................................ 2
6.4Threads ...................................................................................................................................... 2
6.5 Couplings ................................................................................................................................... 2
6.6 Elbows,bendsandnipples ........................................................................................................ 2
Test procedures .................................................................................................................................... 3
Examination of product........................................................................................................................ -3
8.1 Place ofinspection ..................................................................................................................... 3
8.2 Visualinspection ........................................................................................................................ 3
8.3 Retests....................................................................................................................................... 3
Marking .............................................................................................................................................. 3
9.1 Identification ............................................................................................................................... 3

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 Foreword (This ore word is not part ofAmerican National Standard C80.5-1994)

This standard was developed by the Accredited Standards Committee on Raceways for Electrical Wiring
Systems,C80.Theobjective of thecommitteeis to produceacomprehensivespecificationthatwould
establishuniformdimensionsandstandardconstructionrequirementsforrigidmetalconduit,electrical
metallic tubing, intermediate metal conduit and rigid aluminum conduit raceway products and their associated
components.

The standard was originally approved in 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 Electrical
Manufacturers Association, 1300N. 17th Street, Rosslyn, Virginia 22209.

This standard was processed and approved for submittal ANSIto by the Accredited Standards Committee on
Raceways for Electrical Wiring Systems, C80. Committee approval of the standard does not necessarily
imply that all committee members voted for its approval. At the time it approved this standard, the C80
Committee had the following members:

J. A. Gruber, Chairman
J. A. Gauthier, Secretary
Organization Represented Name of Representative

Aluminum Association P.Pollak

American Iron and Steel Institute M.Palivoda
American Pipe Fittings Association R.T.Bryson
International Associationof Electrical Inspectors W.Lilly
International Brotherhoodof Electrical Workers K.R.Edwards
J.Widener
National Electrical Contractors Association C.H.Williams
National Electrical Manufacturers Association A.W.Ballard
C.W.Beile
D.Gearing
J.A.Gruber
J.H.Kuczka
T.McNeive
S.Schauffele
R.Higgenbottom (Alt.)
P.Hodon (Alt.)
R.Jazowski (Alt.)
Telephone Group F.W.McGeehan
Underwriters Laboratories, Inc. G.Rusinski
R.LaRocca (Alt.)

ii

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 ~ ~~~ ~

AMERICAN NATIONAL STANDARD ANSI C80.5-1994

American National Standardfor Aluminum Rigid Conduit-(ARC)

1 Scope

1.1 Thisstandardcoverstherequirementsforseamlessrigidaluminum-alloyconduitforuseasa
raceway for the wires or cables of an electrical system. The conduit is furnished in nominal 104. (3.05-m)
lengths, threaded on each end with one coupling attached.

1.2 This standard also covers conduit couplings, elbows, bends, and nipples and lengths other than1 O ft
(3.05m).

2 Normative reference

The following standard contains provisions which, through reference in this text, constitute provisions of this
American National Standard. At the time of publication, the edition indicated was valid. All standards are
subject to revision, and parties to agreements based on this American National Standard are encouraged to
investigate the possibilityof applying the most recent edition of the standard indicated below.

ANSVASME B1.20.1-1983(R1992),Pipe Threads, GeneralPurpose (inch)

3 Definitions

3.1 Threaded coupling

two sections of rigid
A threaded aluminum coupling is an internally threaded aluminum cylinder for connecting
aluminum conduit.

3.2 Elbow and bend

An aluminum elbow or bend
is a curved section of rigid aluminum
conduit threaded on each end.

3.3 Nipple
An aluminum nipple is a straight section of rigid aluminum conduit not more than 2 ft. (0.61 m) long and
threaded on eachend.

4 Unitsmeasurement
of

The values states in inch-pound units are to be regarded as the standard. The metric equivalents may be
approximate.

5 General requirements

5.1 Circular
cross
section
Rigid aluminum conduit shall have a circular cross section sufficiently accurate to permit the cutting of
threads in accordance with table1.

5.2 Wall thickness

The wall thickness shall be uniform throughout.

5.3 Interior surface

The interior surface shall be free from injurious defects.

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 5.4 Alloy
of an aluminum alloy containing not more than
The conduit shall be made 0.40°/0 copper.

6 Detailed requirements

6.1 Threading and chamfering

Each length of conduit, nipple, elbow, and bend shall be threaded on both ends, and each end shall be
chamferedorotherwisetreatedtoremoveburrsandsharpedges.Threadsshallcomplywiththe
requirements of6.4.

6.2 Identification
Each length of conduit, nipple, elbow andbend shall be identified with the manufacturer‘s name or trademark
and the words, “rigid aluminum conduit.” However, close threaded nipples need not identified.
sobe

6.3 Dimensions
The dimensions and weights of rigid aluminum conduitshall be in accordance with table 1.

6.4 Threads
The number of threads per inch (25.4 mm), and the length of the threaded portion at each end
of each length
of conduit, nipple, elbow and bend shall be as indicated in table 1, and shall conform to American National
Standards for Pipe Threads (inch), ANSVASME 81.20.1-1983 (R1992). The perfect thread shall be tapered
for its entire length, and the taper shall be in&
3/4 (62.5 mm/m).

6.5 Couplings
Couplings shall comply with the following requirements:

6.5.1 The coupling shall be madeof an aluminum alloy containing not more than 0.40% copper.

6.5.2 Couplingsshallbe so made that all threads on the conduit will be covered when the coupling is
pulled tight on standard conduit threads.

6.5.3 Both ends ofthe coupling shallbe chamfered to prevent damage

to the starting thread.

6.5.4 The outside diameter and length of couplings shallbe as indicated in table3.

6.5.5 Couplingsshallbestraighttapped.

6.5.6 Each length of finished conduit shall have one coupling attached.

6.6 Elbows, bends andnipples

Conduit elbows, bends and nipples shallbe made of a similar grade of aluminum as that employed
in straight
lengths of rigidaluminumconduit,andshallbethreaded,andmarkedforidentificationaccordingtothe
applicable requirements for rigid aluminum conduit. The dimensions of 90-degree elbows and the weights of
nipples shall be as indicated in table 4.

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 STD-ANSI C8d- 5-ENGL 3774 0724350 0538283 983 I
ANSI C80.5 -1 994

7 procedures
Test

Ductility shall be determined by the following: conduit shall be capable of being bent cold into a quarter
of a
circle around a mandrel, the radius of which is shown in table
4, without developing cracks.

8 Examination of product

8.1 Place of inspection

All tests and inspections shall be made at the place of manufacture prior to shipment, unless otherwise
specified, and shall beso conducted asnot to interfere with normal manufacturing processes.

8.2 Visual
inspection
if the product
Each length of conduit shall be examined visually, both on the outside and inside, to determine
or other similar injurious defects.
is free from slivers, burrs, scale,

8.3 Retests
If any samples of rigid aluminum conduit tested as prescribed in this specification should fail,two additional
samples shall be tested, both of which shall comply with the requirements of this specification.

9 Marking

9.1 Identification
Each length of conduit, nipple, elbow shall be identified with the manufacturer's name or trademark and the
"rigid aluminum conduit." However, close threaded nipples need not so beidentified.

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 S T D * A N S I CAO-5-ENGL 1994 = 0 7 2 4 3 5 00 5 3 8 2 8 28 3 8
ANSI C80.5-1994

-
Table 1 Dimensions of threads for rigid aluminum conduit

Trade
Size
Threads
Per
Pitch
diameter
at endof
thread Eo,
taper 3/4
7
Istornary Inc -Pound Units

I Length of Thread

Effective
On.)
Overall
Metric
Trade
Size per 25.4
diameter
at endof
thread E,,

mm. per
Effective Overall
Designator In. in. per ft
Lz L.
meter mm
Designator
L, L,
1 12 14 0.7584 0.53 0.78 16 ARC 14 13.46 19.263
19.81
314 14 0.9677 0.55 0.79 21 ARC 13.97 24.580
20.07 14
1 1 1-112 1.2136 0.68 0.98 27 ARC 1 1-112 17.27 24.89
30.825
1-1J4 11-1J2 1.5571 0.71 1.o1 35 ARC 1 1-1 J2 18.03 25.65
39.550
1 -1R 11-1J2 1.7961 0.72 1.O3 41 ARC 1 1-1 J2 18.29 26.16
45.621
2 1 1-112 2.2690 0.76 1.o6 53 ARC 1 1-1 J2 19.30 26.92
57.633
2-1 12 8 2.71 95 1.14 1.57 63 ARC 8 69.075 28.96 39.88
3 8 3.3406 1.20 1.63 78 ARC 8 84.851 30.48 41.40
3-112 8 3.8375 1.25 1.68 91 ARC 8 97.473 31.75 42.67
4 8 4.3344 1.30 1.73 103 ARC 8 11 0.094 33.02 43.94
5 8 5.3907 1.41 1.84 129 ARC 8 35.81 136.924
46.74
6 8 6.4461 1.51 1.95 155 ARC 8 38.35 163.731
49.53

NOTE- Applicable tolerances:

Thread length(LJ: fl thread, recommended practice +O, -1
Pitch diameter: +1 turn is the maximum variation permitted from the gaging offace
the working thread gauges.

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 ~

S T D - A N S I CBO.5-ENGL 3177q m 0724350 0538283 75q

ANSI C80.5 -1994

-
Table 2 Dimensions and weights of rigid aluminum conduit
Customary Inch-PoundUnfts
Minimum Weight
of Ten Unit
Trade Size
Designator
Nominal inside
Diameter (in.)
I OutsideDiameter Nominal Wall
Thickness (in.)
Length Without
Coupling
(ft. and in.)
Lengths with
Couplings
Attached (Ib.)
1 12 0.632 0.1o4 911-114" 27.4
34 0.836 1.050 ' 0.107 911-114" 36.4
1 1 .o63 1.315 0.126 911" 53.0
1 -1 I4 1.394 0.1 33 911" 69.6
1 -1/2 1.624 0.1 38 911" 82.2
2 2.083 0.146 911" 115.7
2-1/2 2.489 0.1 93 910-1 12" 182.5
3 3.090 0.205 910-1 12" 238.9
3-1/2 3.570 4.000 0.215 910-1/4n 287.7
4 4.050 4.500 0.225 9'1 0-1 14" 340.0
5 5.073 5.563 0.245 91O" 465.4
6 6.093 6.625 0.266 91O" 61 2.5
Metric Units
Minimum Weight
of Ten U n l

Metric Trade Nominal Inside I OutsideDiameter Nominal Wall Length Without

Lengths With
Couplings
Size Designator Diameter (mm) I (mm) Coupling (Meters) Attached (kg)
16 ARC 16.1 I 21.3 3.03 12.43
21 ARC 21.2 26.7 2.72 3.03 16.51
27 ARC 27.0 33.4 3.20 3.02 24.04
35 ARC 35.4 42.2 3.38 3.02 31.57
41 ARC 41.2 48.3 3.51 3.02 39.1O
53 ARC 52.9 60.3 3.71 3.02 52.48
63 ARC 63.2 73.0 4.90 3.01 82.78
78 ARC 78.5 88.9 5.21 3.01 108.37
91 ARC 90.7 101.6 5.46 3.00 130.50
103 ARC 102.9 114.3 5.72 3.00 154.22
129 ARC 128.9 141.3 6.22 3.00 211.11
155 ARC 154.8 168.3 6.76 3.00 277.89
NOTES
1 The minimum weight is based on an aluminum alloy havinga density of 0.098 pounds p e r cubic inch (2.70x lo3 kilograms p e r
cubic meter). These minimum weights should be adjusted for alloys having different densities. The minimum weights given are the
of the weight of ten lengthsof conduit with couplings could result a
governing criteria, even though calculations in computed weight
less than the figures given
if minimum dimensions are used.

2 Applicable
tolerances:
Length: f114 in. (6.35mm) (without coupling)
Outside Diameter:
ARC) through2 (53ARC): M.015 in. (39.38mm)
for trade sizes112 (16
(63 through4 (103ARC: 59.025 in. (B.6mm)
for trade sizes2-1/2 ARC) 4
for trade sizes5 (129ARC) and 6 (155ARC): fl%

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STDmANSI C B O - S - E N G L 1794 I0 7 2 4 3 5 0 0538284 h70 E

ANSI C80.5-1994

-
Table 3 Dimensions of couplings
-
Customary Inch Pound Units
TradeSizeOutsideDiameter I MinimumLength Metric Trade Size
Designator I (in.) I (in.) Designator
112 1-5164 1-9116 16 ARC
34 1-21164 1-518 21 ARC 33.73 41.28
1 1-9/16 2 27 ARC 39.69 50.80
1-114 1-61/64 2-1116 35 ARC 49.61 52.39
1-112 2-7132 2-1Il6 41 ARC 56.36 52.39
2 2-34 2-118 53 ARC 69.85 53.98
2-112 3-9/32 3-118 63 ARC 83.34 79.38
3 3-1 3/16 3-1I4 78 ARC 96.84 82.55
3-112 4-7/16 3-38 91 ARC 112.71 85.73
4 5 3-1/2 103 ARC 127.00 88.90
5 6-7132 3-34 129 ARC 157.96 95.25
6 7-5116 d 155 ARC 185.74 L

NOTES-ADDlicable tolerances:
Outside diameter:No plus tolerances
Minus tolerances
-1% for trade sizes1-114(35ARC) and larger
-0.015 in. (0.38mm) for trade sizes1 (27 ARC) and smaller

Table 4 -Dimensions of 90-degree elbows andweights of nipples per hundred

Customary Inch-Pound Units Metric Units
Elbows I Nipples Elbo
Minimum 1 Minimum 1 I Minimum Minimum
Radius to Straight Radius to Straight
Trade Center of Length L. Metric Center of Length L,
Size Conduit at Each A B Tradesize Conduit at Each
Designator (In.) End (in.) Lb. Lb. Designator (mm) End (mm) I kg
1/2 4 1-112 0.022 0.7 16 ARC 101.60 38.10 I 0.010 I 0.32
34 4-1/2 1-1/2 0.031 1.4 21 ARC 114.30 38.1 O 0.014 0.64
1 5-34 1-718 0.043 3.1 27 ARC 146.05 0.020 1.41
1-114 7-114 2 0.057 3.5 35 ARC 184.15 0.026 1.59
1-1/2 a-114 2 0.070 3.8 41 ARC 209.55 0.032 1.72
2 !+ln 2 0.093 4.9 53 ARC 241.30 50.80 2.22
2-1/2 10-112 3 20.8 0.14963 ARC 266.70
0.068 76.20 9.43
3 13 3-118 0.194 24.2 78 ARC 330.20 0.088 10.98
3-1 12 15 3-1I4 0.229 31.1 91 ARC 381O.0 8255 14.1 1
4 16 348 39.8 0.272103 ARC 406.40
0.123 85.73 18.05
5 24 ARC
58.8 0.3671293-518 609.60.166
0 92-08 26.67
6 30 344 0.488 69.2 155 ARC 0.221
762.00 95.25 31.39

NOTE-Each lot of 100 nipples shall weigh not less than the number of pounds (kilograms) determined
by the formula:
W=l00*(lA)-B
where:
W is the weight of 100 nipples in pounds (kilograms)
L is the length of
one nipple in inches (millimeters)
A is the weightof nipple per inch (25.4 mm) in pounds (kilograms)
B is the weightin pounds (kilograms) lost in threading 100 nipples

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