Posted by MarkB_MI on January 14, 2023 at 04:47:08 from (96.59.224.67):
In Reply to: electrical question posted by gbs on January 13, 2023 at 20:22:27:
You go over a bunch of stuff, then you ask: 'so what is the need of the green screw and the second extra coated ground wire between the boxes when they are already bonded as described?'
I think what you may be asking is 'why are two panels bonded together with a ground wire when they're already connected via conduit?' Although it's not mandatory to add a ground wire between two boxes that are connected with conduit, many electricians will do so to provide a redundant ground in case there's a poor conduit connection somewhere. That's true for any electrical box, not just circuit breaker panels. This wire is usually insulated rather than bare, so that it won't arc against a box or conduit if there is a bad conduit connection.
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