EMT recepticle grounding


Old 07-19-05, 03:20 PM
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EMT recepticle grounding

In attaching a grounding type double outlet in a EMT continuous curcuit, is it necessary to connect a ground wire from the switch box to the grounding screw on the outlet or does the attachment to the metal box constitute a suitable ground?
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Old 07-19-05, 03:27 PM
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If the receptacle is rated "self-grounding" then the connection to the metal box is an acceptable ground, provided the box is properly grounded through the conduit or a ground wire. The self-grounding type of receptacles usually grab the mounting screws rather tightly with a copper tab; the screws do not hang loosly like they do in cheaper receptacles.

It is my opinion that good practice dictates attaching a ground wire to both the receptacle and to the metal box "just in case".
Old 07-19-05, 05:46 PM
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It depends on the cover. If it is a raised cover the device needs a ground tail no matter what.
The box and cover type determines whether a ground tail is required. It is always good work practice though to use one.

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