I've got a junction box with typical black and white wires, but then there appears to be 2 yellow wires just passing through. The yellow is the hot. I need to tap into this and run over to add a new outlet to my wall. How would I go about this properly? Thanks!
Since you say yellow is hot and you aren't saying any others are then to me it looks like a junction box in the middle of a 3-way, and the switches are in position for the switched load to be off. The two yellows in the conduit with the white are travelers from a hot fed switch. The conduit with two yellows and black are second switch and switchleg. Flex with black and white are switched fixture (probably a light?).
If I'm right you need to push another wire into the conduit with yellows and white to get to hot the that feeds that switch.
You need to confirm what the wires are feeding, many circuits require dedicated feeds, like kitchen, bathroom, and heating/cooling circuits and some are sized for specific appliance needs.
If yellows are actually a 240v circuit then you need to confirm it's load to verify that the Code doesn't identify it as a load that requires a dedicated circuit, either by load type or size, then read the answer by FreeMan.
Specifically answering the question:
If you want the new outlet on one of the yellow circuits, is there enough slack somewhere in the yellow wire to pull 12" into this box?
- Pull the slack into the box
- cut the wire roughly in the middle, leaving about 6" at each end,
- wire in your new piece of wire and run it through conduit to the new outlet location.
- additionally, pull a new white, neutral wire to the new outlet location and wire nut it to the bundle of whites in this box.
Many other things to consider:
When run in conduit, yellow is a perfectly acceptable and normal color for a hot wire. Notice, too, how you have no green or bare wires? That's because the metal conduit & box are your ground.
Those yellow wires are hot because they're attached to a different circuit and the breakers they're attached to are still on. Are you 100% certain that you want the new outlet on one the yellow circuits? If so, which circuit? Since the black wires are already terminated in this box, it would be very easy to tap into that circuit to add a new wire for a new outlet if you can put a random new outlet on that circuit (kitchen outlets must be dedicated to the kitchen).
Things to consider:
- Where will this new outlet be?
- Are you prepared to connect new conduit to this box or another one to run to the new outlet location?
- If you want the new outlet on one of the yellow circuits, is there enough slack somewhere in the yellow wire to pull 12" into this box?
- By code, each cut end of the yellow wire needs to be about 6" long so there is plenty of working room to make the splice in this box.