I was going to add an outlet to a switched 1 outlet circuit thinking it would be pretty straight forward to run a wire from the switch box to a new outlet. The switch in question is a simple 2-way.
After cutting drywall for the new box, I examined the switch box I was going to connect to and was surprised I could not find any neutral wires (vintage 2013 house- PA). Apparently power is supplied at the outlets and fixtures and only the black loop wires come back to the switches. Not code as I understand it!!
Not a white wire to be found.. no wire nut bundles in the back – no whites to the other switches (3-ways by the way). So am I screwed and have to find a way to run wire to some other place to get my neutral?
I am going to get ahold of the electrician who gave me the idea as I am beyond my understanding zone and either have him tell me what I am missing or have him do it
In the meantime – for my own sanity because I've wasted a good Sunday afternoon, can explain the logic of this method or some concept I am missing or a how-to? The other switches are all 3-ways have 4 wires coming in: 1 red, 2 black and ground. I see no way to use any of those to help me.
Otherwise my only other idea, probably not kosher at all, is to remove the switch and reconfigure the (now) switched outlet to feed power back to the switch-box where I would tie into it for the new outlet.
Best Answer
3-way switching, switch loops, 404.2(C), and you
NEC 404.2(C) is where the requirement for neutrals at switch boxes lives (quoted from the 2014 NEC):
In particular, point 5 above is what applies to your situation. Unfortunately, the normative text of that section wasn't a model of clarity, and this section was reworked in 2017 to try to fix that.
So, you'll need to talk to your electrical inspector. My interpretation of the 2014 text is that you need a neutral at at least one location in a multi-way switching system, but not at every location in said multi-way switching system -- there is room for reasonable people to disagree here though.