Question

in terms of electrical systems, which of the following is required for metal enclosures?grounding pigtailstrapeze hangersmc cablewall mounts

Explanation:

Metal enclosures in electrical systems must be grounded to prevent electric shock hazards by providing a path for fault current. Grounding pigtails are used to establish this required electrical connection to the grounding system. Trapeze hangers, MC cable, and wall mounts are mounting or cabling components, not mandatory safety requirements for the enclosure's electrical safety function.

Answer:

grounding pigtails