Wrong move
Direct answer
The risky shortcut is guessing from cable position in the box. Line is the supply side feeding the device; load feeds downstream devices, and the only safe way to identify it is controlled testing and tracing by a qualified person.
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 Device wiring and drill a smaller set before returning to mixed practice.
Prep path
Guide
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