One common NEC violation is an installation where grounding electrodes aren’t bonded together. All grounding electrodes present at a building must be bonded together to form the grounding electrode system (Fig. 1). Have you seen this rule violated? Have you violated it yourself? And what kinds of items are considered grounding electrodes? Electrode types Each of the following can serve as a grounding electrode [250.52]: • Metal underground water pipe in direct contact ...

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