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Conduit is used to protect
and support electrical wires.

Both rigid conduit and intermediate metallic conduit are threaded and accept couplings, nuts, and bushings et cetera directly.

(1) U.L. 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.



ALL SIZES ARE INCHES

INSIDE DIA.

(ID)

OUTSIDE DIA. (OD)

KNOCKOUT 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

INTERMEDIATE METALLIC CONDUIT  (IMC)

PLASTIC CONDUIT BUSHING SIZES

ELECTRICAL METALLIC TUBING (EMT)

RIGID CONDUIT AND KNOCKOUT SIZES