Cable Tray Fill Calculator
Size cable trays and calculate fill per NEC Article 392.
NEC 392 Fill Requirements
| Cable Type | Tray Type | Max Fill |
|---|---|---|
| Single (4/0+) | Ladder | Sum of diameters <= tray width |
| Single (<4/0) | Ladder | Max 50% cross-section |
| Multiconductor | Ladder | Max 50% cross-section |
| Single (4/0+) | Ventilated | Sum of diameters <= tray width |
| Multiconductor | Solid Bottom | Max 40% cross-section |
Standard Cable Tray Sizes (NEC 392)
| Width (in) | Depth (in) | Cross Section (sq in) | 50% Fill (sq in) | 40% Fill (sq in) |
|---|---|---|---|---|
| 6 | 4 | 24 | 12 | 9.6 |
| 9 | 4 | 36 | 18 | 14.4 |
| 12 | 4 | 48 | 24 | 19.2 |
| 18 | 4 | 72 | 36 | 28.8 |
| 24 | 4 | 96 | 48 | 38.4 |
| 30 | 6 | 180 | 90 | 72 |
| 36 | 6 | 216 | 108 | 86.4 |