Journeyman Lineman (JL) Verbal Practice Test

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Which statement describes a MAC (mutual accessory conductor) in protective grounding?

MAC is an insulated, temporary bypass jumper that holds load.

A MAC is a temporary insulated jumper used to bypass a part of the circuit so the load remains connected while maintenance or testing is done, and the protective grounding path stays intact. The insulation is key because it prevents accidental contact and arcing, which keeps workers safe during the work. It’s not a permanent grounding conductor, it doesn’t function to interrupt fault current like a breaker or fuse, and it wouldn’t be described as a non-insulated jumper.

MAC is a permanent conductor used for grounding.

MAC is a device that interrupts fault current.

MAC is a non-insulated jumper used for temporary bypass.