Do you need to ground a switch/receptacle exclusively when the box is grounded?
#1
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Thread Starter

Assuming BX cables are properly grounded and that the box itself is also grounded. Why do you need to use an extra ground wire between a switch/receptacle when the mounting screws via the metal box already provide a path for ground?
For the record, I do always use the ground pigtail with ground screw but I have a feeling it's redundant.
For the record, I do always use the ground pigtail with ground screw but I have a feeling it's redundant.
#2
Switches are optional* receptacles aren't unless self grounding. The receptacles need a reliable ground which is not provided by a regular receptacle.
*IIRC switches need a ground wire if the cover plate is metal and it isn't self grounding.
*IIRC switches need a ground wire if the cover plate is metal and it isn't self grounding.