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Evan55 06-12-2012 04:06 PM

Adding 2 outlets in the middle of a series of outlets - wiring question
Hello, Im adding 2 outlets (both in the same stud bay) off existing outlets in my garage, one closer to the floor and one parallel to the existing outlets.

Here is a diagram to show my situation and where the new outlets are going in. (red is new outlet or wire, everything is hot)

outlets 2 and 3 are the outlets I am adding. my question revolves around the wiring.

Ive already snaked new wire from 1 down to 2 and from 2 up to 3, so that was the easy part. the question is how to handle the outgoing wire to the rest of the outlet series

so I see 2 options here

option 1 would require moving the outgoing wire from 1 to 3, and is difficult in this situation, but it seems 'right' to my eyes.

I wanted to know if option 2 is acceptable, which would be to keep the existing output wire to the rest of the series from 1 (instead of moving it to 3), and adding another output wire down to outlet 2 .
thus having 2 output wires from the same outlet.

I havent seen this before, so I wasnt sure if it was a good idea

thanks in advance!

AllanJ 06-12-2012 04:54 PM

Option 2 will work electrically but it is possible that box #1 may be too small for all of the wires.

Three cables coming into the box is six hot or neutral wires ends, 6 points.
The receptacle itself, 2 points.
All the ground wires, 1 point.
All the clamps or fingers holding the cables on the box, 1 point.
Total of 10 points, 2 cubic inches per point for 14 gauge wires, 20 ci box needed.
(For 12 gauge wires 2-1/4 ci per point, 23 ci.)

gregzoll 06-12-2012 05:25 PM

Since they have to be protected by gfci, just use option 1.

Evan55 06-12-2012 05:46 PM


Originally Posted by gregzoll (Post 941972)
Since they have to be protected by gfci, just use option 1.

there is already an upstream GFCI, so thats not an issue.

option 2 is the much easier option, so I guess the real question, is option 2 ok and safe.

Thanks Allan, how do I tell if its a 20ci box? its an original box so I cant take it out.

gregzoll 06-12-2012 07:40 PM

Forget option two, go with one. Trust me on this one. I have done something like 2 in my garage, when I rewired it, but I always use the deeper boxes, for those times that I made need more than two Romex in a box, along with a device.

Jim Port 06-12-2012 07:50 PM

A plastic box will have the size stamped on the back of the box. A metal box you would need to know the depth of the box and someone could look it up.

AllanJ 06-13-2012 07:45 AM

If you use a ruler or tape measure (and a barbecue stick to measure the depth) you can get a good enough figure for the size of the box.

If you don't mind, you can add rectangular extension rings on the outside of the box (and get longer screws to hold the receptacle on) to gain more interior space for an existing box.

Evan55 06-14-2012 09:43 AM

Thanks, looks like its a 16 cu/in box. As it turns out, option 1 wont work because the outgoing wire goes back to the left and up, and is stapled to the stud.

box extension sounds like a great option, hadnt thought of that.

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