Calculator | Derating

7 total conductors (you + 6 others) → factor of 0.70 (from NEC Table 310.15(C)(1)).

30 A × 0.80 (temp) × 0.70 (bundling) = 16.8 amps . derating calculator

You need to run 10 AWG copper wire (rated 30A at 30°C) through a conduit in a 50°C ambient environment. The conduit will contain 6 other current-carrying wires. 7 total conductors (you + 6 others) → factor of 0

For 50°C ambient with 90°C wire: Many tables show a factor of 0.80 . Southwire’s Conduit Fill & Derating

Download a trusted derating app (e.g., Southwire’s Conduit Fill & Derating, or ETAP’s cable calculator) and always verify your results against the latest NEC or local electrical code. Your safety—and your equipment’s lifespan—depends on it.