Recognize why absence of voltage must be verified at the exposure point before contact.
A dark indicator is not the same as a dead circuit. Test where exposure will happen Voltage is invisible, and the controls that suggest de-energized status can fail. A lamp can burn out. A disconnect can be mislabeled. A control transformer can backfeed. A temporary generator can energize a circuit from an unexpected direction. That is why electrical safety treats de-energized as a verified condition. The important phrase is exposure point. A qualified person tests the parts workers may contact, not just a convenient upstream location. The test instrument must be appropriate, functional, and used by someone who knows what…
Sign up free — one personalized lesson every day, matched to your role and goals.
Already have an account? Sign in