If everything is wired with 14 gauge romex on a 15 amp breaker, can I use 12 gauge ground as a jumper inside a box? This would be to either ground the box itself or as jumper between to outlets.
Electrical – use #12 ground wire as jumper when the other wire in the box is #14
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Best Answer
Yes. You can always use larger gauge wire than for what the circuit is protected. One limitation may be making sure you don't try to cram more/larger wires into the box than what it's capacity is.