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12 AWG THHN, 6 conductors in conduit, ambient 38°C.
20A breaker, THHN, 3 conductors (no bundling derate), ambient 48°C. derating chart
Go to the manufacturer's published derating chart—NEC tables are conservative but code-minimum. For safety-critical systems (cranes, data centers, hospitals), derate one extra step (e.g., use next lower ambient column). 12 AWG THHN, 6 conductors in conduit, ambient 38°C
Derating is not merely a suggestion; it is a fundamental aspect of Design for Reliability (DfR). There are three primary reasons for its strict application: 12 AWG THHN
12 AWG THHN, 6 conductors in conduit, ambient 38°C.
20A breaker, THHN, 3 conductors (no bundling derate), ambient 48°C.
Go to the manufacturer's published derating chart—NEC tables are conservative but code-minimum. For safety-critical systems (cranes, data centers, hospitals), derate one extra step (e.g., use next lower ambient column).
Derating is not merely a suggestion; it is a fundamental aspect of Design for Reliability (DfR). There are three primary reasons for its strict application: