Journeyman Lineman (JL) Verbal Practice Test 2026 – Comprehensive All-In-One Guide for Exam Success!

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What safety step must be taken before adjusting a tap changer?

Verify the rating of the transformer on the nameplate.

Always de-energize before making changes; check the nameplate.

Before adjusting a tap changer, isolate the equipment and de-energize it, applying lockout/tagout as required. Tap changers are connected to a live transformer circuit, and making changes while energized can cause severe shock, arc flash, or damage to the transformer. After isolation, verify the transformer rating on the nameplate to ensure you’re following the correct procedure for that unit and staying within its rated limits. Simply checking the rating or observing without power does not provide real protection, and ignoring the nameplate is unsafe and could lead to improper settings.

Only observe visually; no power off needed.

Ignore the nameplate and proceed.