Calculation — Derating

Total Factor=F1×F2×F3…×FnTotal Factor equals cap F sub 1 cross cap F sub 2 cross cap F sub 3 … cross cap F sub n Key Factors and Variables

Common environmental stresses that require derating include: derating calculation

: If the ambient temperature exceeds the rated value (often for cables), a correction factor ( Ctcap C sub t ) must be applied. Example : A cable rated for 100A at might only safely carry 82A at depending on the NEC Ampacity Tables. derating calculation