I have a few electrical questions as I am doing finish on a remodel.
1) Do switches need to be grounded to the box? If so, can I just run a
piece of copper from the switch to the ground screw on the box. If so, I
have to double up on the ground screw. Is this a problem?
2) With receptacles, a few of them have large looms of ground wires and
rather than undoing it and adding a pigtail to ground to the receptacle, can
I just run a ground wire directly from the receptacle to the ground screw on
the box. Again I have to double it up around the screw. Is this a problem?
3) Lastly, can I double up switch legs on a lug on a switch if I want to tie
a couple of banks of lights with separate switch legs together for example.
They should be grounded if they have a green screw. If you are using metal
cover plates then I believe you must use this type so the cover will be
grounded. I don't think you will have any luck trying to double up wires.
It's hard enough to get the one wire on there. Try using the green wirenuts
with the feed through hole or ready made pigtails.
You can get 'grounding type' outlets that will properly ground without using
the green screw. I use the Leviton Pro Grade model BR15 (red box). I think
you can also use standard outlets if you remove the paper washers that holds
the screws so that there is metal to metal contact with the yoke and metal
box (not just the screws).
Use pigtails. Or another way is to strip some insulation, 1/2" or so,
beginning a few inches back on one of the wires and loop the one wire around
the screw. Then wirenut the second wire to the end of the first wire. Sorta
like making a pigtail without cutting the wire.
Note make sure you use the correct wire gauge for pigtails. Match the other
wires. 12ga for 20Amp and 14ga for 15Amp
For a grounds, they sell brass sleeves that crimp around wires. I am not
sure why, but around here they are required, rather than wirenuts.
If you have a steel box, the device is grounded through the attachment
screws. Still, it is prudent to ground it with a wire also.
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