Wrong move
Direct answer
The risky shortcut is counting every wire the same way or ignoring neutrals that must be counted. Derating can be required when conductor count, ambient temperature, raceway conditions, or other correction factors reduce allowable ampacity.
How to use this answer
Read the answer once, then prove it by choosing an answer in a practice question before looking at the explanation. If the miss repeats, tag the domain as Conductor sizing and drill a smaller set before returning to mixed practice.
Prep path
Journeyman Electrician Study Guide
Independent journeyman electrician study guide for code navigation, calculations, wiring methods, and safety review.
SamplesJourneyman Electrician Sample Questions
Public Journeyman Electrician Practice Test sample questions with explanations.
PracticeOpen Journeyman Electrician Practice Test
Start with the 15-question free set before deciding whether to unlock the paid bank.