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Run components at 60-80% of their maximum rating for 100% reliability.

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. derating calculator

For 50°C ambient with 90°C wire: Many tables show a factor of 0.80 . Run components at 60-80% of their maximum rating

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. Southwire’s Conduit Fill & Derating

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

10 AWG copper = 30 amps (based on NEC 310.16 for 90°C insulation).