I'm going to be changing an outlet from a two prong to a 3 prong. The
wires are BX cable and the metal box is grounded through the armor.
Is the outlet then grounded when I attach is to the box or do I still
need to run a wire from the green screw to the box?
That is what I did here, and the test meter is happy. Coiling the ground
wire under the cable clamp in the box is how we did it for 40 years. I
understand (from threads on here) that it doesn't meet code any more,
and they wanna see that pigtail. But I didn't want to disturb that 40 YO
romex to add self-grounding receptacles to grounded metal boxes (to
replace the 2-holers), and there really isn't much inspection in this
township, so I said the hell with it.
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