Change mwbc to add gfci


Old 01-11-18, 05:30 PM
Join Date: Mar 2010
Location: USA
Posts: 3,759
Received 42 Votes on 40 Posts
When a 2 wire cable brings power (and neutral) into the second box (or any box) that neutral is not shared with anything else and is used only with the hot from the same cable to power lights, receptacles, etc..

When a 3 wire cable brings a MWBC power feed into a box, its neutral is used only with the hots in that cable and that neutral is never shared with anything else (connected to lights etc. powered by the hot from another cable).
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