I changed some plugs and switches on numerous circuits to upgrade. All of the additions function. One plug, I did not alter, has gone to ground. (The voltage is 120 from ground to either side, but the plug is not measuring anything.
Best answer:
Answer by bobweb
Romex wire typically has 1 black (hot 120 vac), one white (return 120 vac) and one bare copper wire (safety ground). The black hot wire gets connected to the darker brass colored screw terminals on one side of the 120 vac plug outlet. The white return wire gets connected to the lighter brass colored screw terminals on the opposite side of the 120 vac outlet. Finally, the bare copper safety ground wire gets connected to the green screw at the bottom of the 120 vac plug outlet. Usually, the white return and safety ground wires are connected to the same grounding blocks at the electrical service entrance breaker box. Consequently, there should be no voltage reading in between the white return wire and the bare copper safety wire. You should read 120 vac in between the white return or safety ground wires and the black hot 120 vac wire.
Affordable testers are accessible at electrical supply stores for checking the right polarity is wired to every outlet. The tester simply plugs into the outlet and lights up to indicate a very good or bad polarity wiring of the outlet.
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Orignal From: Q&A: Why is one plug on a circuit going to ground?
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