Practice question

Best practice when probing live 120 VAC at the cabinet back panel is to:

  1. Use insulated probes, PPE (rated gloves/face shield) as required by the agency, and a CAT III/IV-rated meter with the cabinet door secured against accidental contact
  2. Probe with bare alligator clips
  3. Bypass the cabinet's main breaker before probing
  4. Stand on a damp metal plate

Answer: A — Use insulated probes, PPE (rated gloves/face shield) as required by the agency, and a CAT III/IV-rated meter with the cabinet door secured against accidental contact

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