Conduit Fill Calculator
Calculate NEC-compliant conduit fill for solar PV wiring installations.
NEC Conduit Fill Rules
| Conductors | Max Fill | NEC Reference |
|---|---|---|
| 1 conductor | 53% | Chapter 9, Table 1 |
| 2 conductors | 31% | Chapter 9, Table 1 |
| 3+ conductors | 40% | Chapter 9, Table 1 |
Wire Area Reference (THWN)
| Size | Area (sq in) | Size | Area (sq in) |
|---|---|---|---|
| 14 AWG | 0.0097 | 4 AWG | 0.0824 |
| 12 AWG | 0.0133 | 2 AWG | 0.1158 |
| 10 AWG | 0.0211 | 1/0 AWG | 0.1855 |
| 8 AWG | 0.0366 | 4/0 AWG | 0.3237 |
| 6 AWG | 0.0507 | 250 kcmil | 0.3970 |