Conduit Sizes

Electrical conduit trade sizes, max distance between supports

Conduit Trade Size (in) Inside Diameter Max Distance Between Supports
Rigid Metal (Non Metal)
(ft)
(inches) (mm)
1/2 0.622 15.8 10 (3)
3/4 0.824 20.9 10 (3)
1 1.049 26.6 12 (3)
1 1/4 1.380 35 14 (5)
1 1/2 1.610 40.9 14 (5)
2 2.067 52.5 16 (5)
2 1/2 2.469 62.7 16 (6)
3 3.068 77.9 20 (6)
3 1/2 3.548 90.1 20 (7)
4 4.026 102.3 20 (7)
5 5.047 128.2 20 (7)

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