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3 out of 4 fail. Don't walk in cold.
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292 question bank, NEC 2023 197 NEC + 95 calculation questions, each hand-checked against the NEC.
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See a real question
One of the 292, pulled straight from the bank. Tap an answer and judge the quality yourself — no signup.
A 4/0 AWG copper conductor with 90°C-rated insulation (THHN) is installed in a dry location with terminations rated 90°C and equipment listed for 90°C use throughout. Per Table 310.16 at the 90°C column for copper, what is the allowable ampacity before any correction or adjustment?
Worked solution
For 4/0 AWG copper, Table 310.16 gives 195 A at 60°C, 230 A at 75°C, and 260 A at 90°C. The scenario states all terminations and equipment are 90°C-rated, so the 90°C column applies and the table ampacity is 260 amperes (before any temperature or conductor-fill corrections).
Why B is the classic trap: 230 A is the 75°C value — the ceiling 110.14(C) forces on you whenever terminations are only 75°C-rated, which is most real equipment. The exam checks whether you read the termination rating, not just the wire.
NEC reference: Table 310.16 · 110.14(C)
Every one of the 292 questions comes with this — answer, reasoning, and the exact NEC article.
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