Electrician Red Seal · Question
An electrician must work on a de-energized 600V motor control circuit. After testing for absence of voltage, what is the most critical next step in the safe work procedure?
Applying a personal lock and tag (Lockout/Tagout - LOTO) is the most critical step after verifying zero energy. This ensures that the circuit cannot be accident
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Question: An electrician must work on a de-energized 600V motor control circuit. After testing for absence of voltage, what is the most critical next step in the safe work procedure?
Answer options:
- Immediately start work on the circuit.
- Fill out a hot work permit. ✅ Apply a personal lock and tag to the isolation device.
- Notify the building manager that the power is off.
Correct answer: Apply a personal lock and tag to the isolation device.
Explanation: Applying a personal lock and tag (Lockout/Tagout - LOTO) is the most critical step after verifying zero energy. This ensures that the circuit cannot be accidentally re-energized by someone else while the work is in progress, which is the fundamental principle of safe isolation.
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