grounding a metal outlet box

Old 07-24-12, 08:02 AM
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grounding a metal outlet box

Does code require a separate grounding wire for a metal box containing a 50 amp 220 volt receptacle, even though it's already grounded through the metal cover attached directly to the receptacle ground?
Old 07-24-12, 08:29 AM
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Yes. The ground wires need to be connected together and pigtailed to the box using a 10-32 machine screw in a tapped hole.

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