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RIGID CONDUIT AND KNOCKOUT SIZES

INTERMEDIATE METALLIC CONDUIT  (IMC)

ALL SIZES ARE INCHES

INSIDE DIA. (ID)

OUTSIDE DIA. (OD)

TRADE SIZE

THDS PER INCH

NOM.

NOM.

MAX.

1/2

14

0.675

0.815

0.819

3/4

14

0.879

1.029

1.034

1

11-1/2

1.119

1.290

1.295

1-1/4

11-1/2

1.468

1.638

1.645

1-1/2

11-1/2

1.703

1.883

1.890

2

11-1/2

2.170

2.359

2.367

2-1/2

8

2.597

2.857

2.867

3

8

3.216

3.476

3.486

3-1/2

8

3.711

3.971

3.981

4

8

4.206

4.466

4.476

UL Proposed Dimensions for Intermediate Metallic Conduit - Type I.

IMC Threads and Knockout Sizes are the same as Rigid Metal Conduit.

Standard rigid threaded conduit fittings can be used with I.M.C.



PLASTIC CONDUIT BUSHING SIZES

ELECTRICAL METALLIC TUBING (EMT)

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