Answer :

Final answer:

Personnel must wear a harness and be attached to a fall arrest line when entering a "permit required" space.

Explanation:

When entering a "permit required" space, personnel must wear a harness and be attached to a fall arrest line. A fall arrest system is a safety measure used to prevent or minimize injury in the event of a fall. It typically consists of a harness worn by the person and a line or lanyard that is attached to an anchor point.

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