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Conduit Sizes
Electrical conduit trade sizes, max distance between supports
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| 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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