Cable Derating Factor [exclusive] Info

Note: For high temperatures >55°C, special cables are required.

Neglecting derating factors is one of the leading causes of electrical fires in fixed installations. A robust design must always account for the worst-case thermal environment the cable will inhabit, not the ideal conditions of a testing lab. cable derating factor

$$I_b \leq I_n \leq I_z$$

Standard tables assume a specific reference temperature (e.g., 30°C in air, 20°C in ground). If the surrounding temperature is higher, the temperature differential between the cable and the environment is smaller, reducing heat dissipation. Note: For high temperatures >55°C, special cables are