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Sep 14, 2021 at 20:45 comment added SteveSh Agree 100% with the "The mere presence of a 4-wire socket does not mean it is actually grounded" comment. Just because it has provisions for 4 wires doesn't mean that they are all being utilized properly, particularly in the case of older homes with a mixture of wiring (NM, BX, etc).
Sep 13, 2021 at 20:41 history answered Harper - Reinstate Monica CC BY-SA 4.0