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Today I wired a single-phase 20 amp 220V 3-blade receptacle. After testing as expected, I got 220 V when both hot receptacle slots were tested. Also got 110 Volt from the ground receptacle slot to each of the hot wires slots individually. I have a metal receptacle box and happened to notice it registers 110 V when I touch a single hot receptacle slot and the metal box. I thought this odd since my ground is insulated and not a bare cooper wire. Is this normal? Does the female receptacle ground to the metal box? (no neutral was wired)
 

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Yes this is normal if you grounded the box properly. The ground is to give you a low impedance path back to your panel so the breaker will trip if there is a short to ground, and so your body would be a higher impedance and not go back through you. :thumbsup:
 

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Does the female receptacle ground to the metal box? (no neutral was wired)
All metal boxes should have a ground pigtail from the device (receptacle) to the metal box. There will be a 10/32 threaded hole in the box. Take a green or bare wire and a green grounding screw from this connection point to the grounded terminal of the receptacle. Yes, is the answer to your question.

Note: There are exceptions to this rule. But to be on the safe side, just install the jumper.
 
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