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Electrical Conduit Specifications

Outside Diameter of IMC, EMT and RGS Electrical Raceway

Intermediate Metal Conduit, Electrical Metallac Tubing, Rigid Steel Conduit

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Size

EMT

IMC

Rigid

Decimal

Fraction

Decimal

Fraction

Decimal

Fraction

1/2"

0.706

11/16

0.815

13/16

0.84

13/16

3/4"

0.922

15/16

1.029

1

1.05

1-1/16

1"

1.163

1-3/16

1.29

1-5/16

1.315

1-5/16

1-1/4"

1.51

1-1/2

1.638

1-5/8

1.66

1-11/16

1-1/2"

1.74

1-3/4

1.883

1-7/8

1.9

1-7/8

2"

2.197

2-3/16

2.36

2-3/8

2.375

2-3/8

2-1/2"

2.875

2-7/8

2.857

2-7/8

2.875

2-7/8

3"

3.5

3-1/2

3.476

3-1/2

3.5

3-1/2

3-1/2"

4

4

3.971

4

4

4

4"

4.5

4-1/2

4.466

4-7/16

4.5

4-1/2

5"

       

5.563

5-9/16


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