Arizona Drivers Permit Practice Exam Guide

When multiple grounding electrodes are present at a building (e.g., ground rod, water pipe), what must be done to them?

They must be kept completely isolated from each other They must all be bonded together to form a single grounding electrode system Only one can be used; the rest must be removed They must be connected to different neutral wires

Correct Answer:

They must all be bonded together to form a single grounding electrode system

Explanation:

The NEC requires that all grounding electrodes present at a building be bonded together to establish a uniform potential across the grounding electrode system.

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