Conduit Capacity Chart
Simplified conduit capacity chart – a conduit fill chart that outlines the values for various wire sizes across different conduit sizes. The values are simplified to reflect only the conduit size, without distinguishing between types. The figures displayed represent the lowest values from the various conduit types.
| Conduit Size | Wire Size (THHN/THWN) | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 14 | 12 | 10 | 8 | 6 | 4 | 3 | 2 | 1 | 1/0 | 2/0 | 3/0 | 4/0 | 250 | 300 | 350 | 400 | 500 | 600 | 700 | 750 | ||||
| 1/2 inch | 12 | 9 | 5 | 3 | 2 | 1 | 1 | 1 | 1 | |||||||||||||||
| 3/4 inch | 22 | 16 | 10 | 6 | 4 | 2 | 1 | 1 | 1 | 1 | 1 | |||||||||||||
| 1 inch | 35 | 26 | 16 | 9 | 7 | 4 | 3 | 3 | 1 | 1 | 1 | 1 | 1 | |||||||||||
| 1 1/4 inch | 52 | 38 | 24 | 14 | 10 | 6 | 5 | 4 | 3 | 2 | 1 | 1 | 1 | 1 | 1 | |||||||||
| 1 1/2 inch | 76 | 56 | 35 | 20 | 14 | 9 | 7 | 6 | 4 | 4 | 3 | 2 | 1 | 1 | 1 | 1 | ||||||||
| 2 inch | 135 | 98 | 62 | 35 | 25 | 16 | 13 | 11 | 8 | 7 | 6 | 5 | 4 | 3 | 3 | 2 | 1 | 1 | 1 | 1 | ||||
| 2 1/2 inch | 200 | 146 | 92 | 53 | 38 | 23 | 20 | 17 | 12 | 10 | 8 | 7 | 6 | 5 | 4 | 3 | 3 | 2 | 1 | 1 | ||||
| 3 inch | 291 | 212 | 134 | 77 | 55 | 34 | 29 | 24 | 18 | 15 | 12 | 10 | 8 | 7 | 6 | 5 | 5 | 4 | 3 | 3 | ||||
| 3 1/2 inch | 412 | 301 | 189 | 109 | 79 | 48 | 41 | 34 | 25 | 21 | 18 | 15 | 12 | 10 | 8 | 7 | 7 | 5 | 4 | 4 | ||||
| 4 inch | 518 | 378 | 238 | 137 | 99 | 61 | 51 | 43 | 32 | 27 | 22 | 18 | 15 | 12 | 11 | 9 | 8 | 7 | 5 | 5 | 4 |
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* This table is offered for informational purposes only and is subject to errors.
* Wire & Cable installation can be dangerous and hazardous. Please consult a licensed electrical professional for proper selection and installation.
The information provided is simplified and intended for reference only. For the most accurate and up-to-date details, please refer to Table C.1, Table C.3, Table C.4, and Table C.9 in the 2020 NEC® (National Electrical Code®).