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Posted by RBM on July 25, 2006, 6:50 pm
What it looks like you have, is an Edison circuit, which is two hot legs
that share a common neutral. The conduit with the three wires would be the
feeds. The red wire is a feed that just continues somewhere else. The
problem is that you cannot share a neutral of a multiwire or Edison circuit
off the "load" of a GFCI. You need to connect all three whites together with
a fourth pigtail connected to the "line" neutral of the GFCI. Leave the
black and red that are wirenutted together alone. Connect the two blacks
together with a third pigtail to the "line" hot of the GFCI. You are now
protecting that one location only. You need to go to the next outlet
downstream and install anther GFCI, and continue doing this until you no
longer have an Edison circuit involved
> ok closer inspection reveals three conduit wires coming into box where im
> trying to install GFCI. One has a black a white and a red- the red is
> connected to a black of another conduit. the two other conduits have just
> a black and a white each.
> the two free blacks test hot with either the ground or the white which
> comes from the conduit running the white black and red.
> any ideas on gfci line and load-what whites should go where? im pretty
> sure
> the conduit with blackwhiteand red is my line wire.
> thanx
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