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(1) UL Table NAE.3.
(2) Maximum Outside Diameter Per ANSI C80.1-1977.
(3) Dimensions for trade sizes of 1/4 through 1-1/4 are from Table 20.2 of ANSI/UL 514-1978.
Sizes 1/ 2 " thru 6" per proposed revision to NEMA Engineering Bulletin No. 71, Aug. 1976.
Both rigid conduit and intermediate metallic conduit are threaded and accept couplings, nuts, and bushings et cetera directly.
|
ALL SIZES ARE INCHES |
INSIDE DIA. (ID) |
OUTSIDE DIA. (OD) |
KNOCK OUT SIZE |
||
|
TRADE SIZE |
THDS PER INCH |
NOM. (1) |
NOM. |
MAX. (2) |
NOM. (3) |
|
1/4 |
18 |
0.364 |
0.540 |
N/A |
0.575 |
|
3/8 |
18 |
0.493 |
0.675 |
N/A |
0.718 |
|
1/2 |
14 |
0.634 |
0.840 |
0.855 |
0.875 |
|
3/4 |
14 |
0.836 |
1.050 |
1.066 |
1.109 |
|
1 |
11-1/2 |
1.063 |
1.315 |
1.331 |
1.375 |
|
1-1/4 |
11-1/2 |
1.394 |
1.660 |
1.676 |
1.734 |
|
1-1/2 |
11-1/2 |
1.624 |
1.900 |
1.916 |
1.984 |
|
2 |
11-1/2 |
2.083 |
2.375 |
2.399 |
2.469 |
|
2-1/2 |
8 |
2.489 |
2.875 |
2.904 |
2.969 |
|
3 |
8 |
3.090 |
3.500 |
3.535 |
3.594 |
|
3-1/2 |
8 |
3.569 |
4.000 |
4.040 |
4.123 |
|
4 |
8 |
4.050 |
4.500 |
4.545 |
4.641 |
|
4-1/2 |
8 |
4.506 |
5.000 |
5.050 |
5.109 |
|
5 |
8 |
5.073 |
5.563 |
5.619 |
5.719 |
|
6 |
8 |
6.093 |
6.625 |
6.691 |
6.813 |
Electrical Steel Conduit Sizes.
Conduit Size.
RIGID CONDUIT AND KNOCKOUT SIZES
