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breaker box green grounding screw

james prosise

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Without the screw, the combined neutral/grounding bar of most (if not all) load centers "floats" from the enclosure.

The intent of the green bonding screw (or strap) is to protect the metallic panel box if it were to become accidently energized. The screw provides a reliable path back to the utility grounded conductor for that fault current. Then, rather than waiting for someone to get electrocuted by touching the hot panel, the ground fault would be cleared by one of the OCPDs in the normal way (a breaker would trip).

Nothing to do with electrolysis.

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  • 9 years later...

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