I'm competent with GFCI and electircal wiring but I have a question
about this situation. All wiring is copper with ground.
I have one hot cable coming into a receptacle and two cables leaving
which each lead to a different electical outlet. Usually things are
wired in series instead of this situation I have. My plan was to
replace the regular outlet in this receptacle with a GFCI and just
attach both of the outgoing lines to the LOAD terminal of the GFCI.
However the instructions with the GFCI say "Do NOT install the GFCI
receptacle in an electrical box containing more than four wires (not
including the grouding wires)." Why do they say not to install a
GFCI if you have three cables in a receptacle? Is it just incase the
user cannot figure out which one is hot Hot or is there another
reason? Parallel wiring isn't common but i always assumed it was
just to avoid confusion as to where circuits are coming/going.
Any thoughts appreciated.
If your outlet box is large enough, you can install any number of
conductors. I don't know what you're reading as I've never seen this, but
just install the feed wires on the line side and pigtail the load wires
together with a tail to the load side of the GFCI. Do not install four wires
onto the load side of the device.
1. Those GFCI's occupy a lot of cubic inches and you may not be
code-compliant with a lot of wires/connectors in the same box as that
big fat GFCI.
2. The instructions-for-dummies that come with the GFCI help you
identify common wiring schemes and do not deal with anything but the
simplest cases. They're covering their ass in case someone hooks it up
but leaves some downstream outlets actually upstream.
OK, no sweat there (assuming you truly want both downstream outlets GFCI
Probably just a box fill issue. GFCIs are big, and that many conductors plus a
GFCI in a single-depth box would be overfilled. If the box is single-depth,
chop it out and use a deep old-work box and you should be golden.
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