Posted by mkirsch on February 02, 2012 at 07:13:08 from (64.80.110.75):
In Reply to: More Electrical stuff posted by Mike (WA) on February 01, 2012 at 08:49:12:
Ground and neutral go to the same bus bar(s) in the main panel.
The way I understand it, the ground line running through the wall is not meant to carry current normally. It is there just in case something goes wrong, to provide a path to ground that doesn't involve your body.
In -2 Romex, the ground wire is bare copper. It is lacking the insulation that the other normal current-conducting wires have.
You need a separate, fully-INSULATED, neutral wire because it's carrying current, even though both wires end up in the same place.
That outer jacket on the Romex is meant to protect the insulation on the wires, not to be the primary insulator. One pinhole or nick in that outer sheath on a run that uses the bare copper as a neutral is a potential problem.
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