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turbopsu
Feb 21, 2012, 11:07 AM
I'm trying to determine if I can pull power from an existing light switch to create a new outlet. The switch runs a light but the source of the power is at the switch. Only working with 14/2 in this circuit. At the light switch, there is the power source, the feed to the light, and a feed to continue the circuit.

Current wiring is as follows: All 3 whites nutted together, all grounds together with a pigtail to the switch, the hot from the source and the hot going to the next part of the circuit are nutted together with a pigtail. The pigtail goes to the switch and the hot for the light goes from the switch to the light.

My questions are: Can I just tap into the power with a new cable to run to the new outlet? Would I need to increase the box size to avoid box fill restrictions? (currently an 18 cubic inch box is in use).

Please let me know if there is more info needed.

Thanks in advance for any input and advice!

tkrussell
Feb 21, 2012, 11:17 AM
Since there are whites spliced in the switch box, sounds like you do have the live feed and the neutral, and you can extend the circuit.

Good question on the box fill, many people do not consider this.

The existing 18 Cu In box cannot handle an additional cable.

Each #14 needs 2 cubic inch of space, and the grounds are all counted as one conductor, and the switch needs the space of two #14. So 7 wires plus two for the switch at 2 CI each equals 18.

The box could be changed out with either a deeper one, if the partition allows, or they make a single gang box with a "balloon" side expansion space.

turbopsu
Feb 21, 2012, 11:25 AM
Thank you very much for your quick answer and lesson on box fill! Any tips on how to get the old plastic box out without tearing out drywall? The depth is available so I'll probably go that route for a new box.

Thanks again!

tkrussell
Feb 21, 2012, 11:30 AM
Tips to remove a plastic box side nailed to the stud?

That involves on the job training, and guessing.

Depends on what tools you have to cut most of the box material away so you can use a pry bar or pliers the get the box nails out.

I could do it, and you would never know I was there.

Up to your skills and tools available.

turbopsu
Feb 21, 2012, 11:38 AM
Thanks... I imagine the jig or dremmel will do the trick. Cheers!

tkrussell
Feb 21, 2012, 11:40 AM
A Dremel with the right bit is a great idea.

Jigsaw? Na, if I were running it then you would need an entirely new wall.

Good luck.