grounding of switches (faceplates)

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Is a switch considered grounded when it is mounted on a grounded 4 square box with a mud ring or does it need a bonding jumper?
 
Re: grounding of switches (faceplates)

yes and no. a bonding jumper to a switch on a grounded box is not required, it is on a receptacle as the bonding jumper is part of the ground fault return path.
 
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