Should non-current-carrying metal parts of equipment be treated as energized at the voltage to which they are exposed?

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Multiple Choice

Should non-current-carrying metal parts of equipment be treated as energized at the voltage to which they are exposed?

The main idea is to protect workers by assuming any exposed non-current-carrying metal part could be energized at the system voltage. Even though these parts don’t normally carry current, a fault, insulation failure, or contact with live conductors can energize them. Treating them as energized ensures you apply the right precautions—verify de-energization with lockout/tagout, establish a proper arc-flash boundary, and wear the correct PPE—so you don’t underestimate the shock or arc-flash hazard. Insulation status isn’t a reliable guarantee of safety, since insulation can be damaged or fail, letting the metal surface reach line voltage.

The main idea is to protect workers by assuming any exposed non-current-carrying metal part could be energized at the system voltage. Even though these parts don’t normally carry current, a fault, insulation failure, or contact with live conductors can energize them. Treating them as energized ensures you apply the right precautions—verify de-energization with lockout/tagout, establish a proper arc-flash boundary, and wear the correct PPE—so you don’t underestimate the shock or arc-flash hazard. Insulation status isn’t a reliable guarantee of safety, since insulation can be damaged or fail, letting the metal surface reach line voltage.

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