$$A \ge \fracI_sc \times \sqrttK$$
Let's look up approximate factors from a standard chart (e.g., IEC 60364): copper cable sizing
Prevents cables from overheating and starting fires. $$A \ge \fracI_sc \times \sqrttK$$ Let's look up
The best electricians don't just read ampacity tables; they understand why the table says what it does. They account for the heat, the distance, and the neighbors in the conduit. copper cable sizing
When you zip-tie 10 current-carrying conductors together in a conduit, they trap heat. The NEC requires a "bundling derating factor" – often as low as 70% for 7-9 conductors. A cable that is perfectly rated in free air is dangerously undersized inside a packed raceway.
