Field answer
Direct answer
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. Use the current equipment manual, code book, employer procedure, and qualified supervision before applying this on live work.
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.
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