Ground wire in a metal box


Old 08-18-03, 03:04 PM
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Ground wire in a metal box

When putting in switch's or recp. in a metal box should I connect the ground wire to the box or to the switch/recpt. Or pig tail it and connect it to both. Thanks
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Old 08-18-03, 03:09 PM
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Connect to the switch or receptacle.
Old 08-18-03, 05:22 PM
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Old 08-19-03, 06:33 AM
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The box is required to be grounded. The mounting screws of a device are not allowed as the only ground. Pigtail and hook up to both.
Old 08-19-03, 09:09 AM
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Art 250.148 (A), Metal Boxes reads-----"A connection shall be made between the Equiptment Grounding Conductor(s) and a metal box by means of a grounding screw or a listed grounding device"
Old 08-19-03, 09:23 AM
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So if you mount an expansion ring/box on an existing box for more room, you would have to pigtail a ground on each one? Or since the expansion box is not a device, the standard mounting screws are sufficient to continue the ground connection?
Old 08-19-03, 10:05 AM
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The mounting screws for attaching boxes together (gangable), or mounting a plaster ring provide an adequate ground connection.
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