# Box fill and wire nuts

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Hello:

I have a question amout box fill with wire nuts and pigtails. I have a 2 gang box with 12/2 coming in and two 12/3 wires going out. The box is for 2 switches. I was having problems getting 5 wires under one wire nut so I pigtailed them to another wire nut. So what it looks like in the box now:

-3 white wires under 1 wire nut
-3 green under 1 wire nut pigtailed (4 in total under the first wire nut) to another wire nut with 2 grounds running to each switch (so 3 in that wire nut)
- 3 blacks under 1 wire nut pigtailed (4 in total under the first wire nut) to another wire nut with 2 more wires running to eache switch

So there are 5 wire nuts in the box. This box is in a shallow wall and is only 25 cu. inch. Is this acceptable for box fill?

Here is a rough sketch of what it looks like:

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Your box is too small. For box fill you have 13 #12's x 2.25 cubic inches = 29.25.

Under the NEC pigtails and wire nuts do not count towards fill. Under the CEC wire nuts count towards fill.
Your box is too small. For box fill you have 13 #12's x 2.25 cubic inches = 29.25.

Under the NEC pigtails and wire nuts do not count towards fill. Under the CEC wire nuts count towards fill.

How did you get to 13 #12's? Any suggestions to fix this, again it is a shallow wall?
one 12/2 = 2
two 12/3 = 6
ground =1
two switches = 4
total = 13, assuming you have no internal clamps.
one 12/2 = 2
two 12/3 = 6
ground =1
two switches = 4
total = 13, assuming you have no internal clamps.
Again, how can I rememdy this in the shallow wall? Do they make a shallow 2 -gang box that is as wide as a 3 gang?
How shallow is the wall? What is behind it? Is there a wall covering?
You may be able to use a 4" square box (metal) with a deep mud ring to gain enough room, or a three gang box with one space in the cover blanked.
How shallow is the wall? What is behind it? Is there a wall covering?
You may be able to use a 4" square box (metal) with a deep mud ring to gain enough room, or a three gang box with one space in the cover blanked.

I was using an old work box since I didn't want to tear out a portion of the wall. The new work box I just picked up will fit and it is 32 cu. in. and states 14/12 wires on it. So I should be ok with the box fill now.

Is how I connected it in the diagram inpost 1 a problem? Or is it acceptable to use multiple pigtail and wire nuts since they son't fit under 1 nut?
The multiple wirenuts is not a problem, but you could also use larger wirenuts (blue) or Wago-style pushin connectors that accept eight wires.
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