314.16 22.5 cu inch box

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cdwirenut

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Ok, I just read a couple threads involving 314.16 & i'm a little confused.
what's the short answer for putting (9) #12 conductors ea./w Ground in a 22.5 cu. inch outlet box. It's a regular Carlon plastic switch box, new work, deep but narrow.
The application is for a baseboard heater control. This is a remodel job & I'm getting creative with my wall framing. (long story) the short of it is I'm trying to keep a load bearing post as slim as possible.
 
9 #12 = 2.25 x 9 = 20.25
EGC = 2.25 x 1 = 2.25

20.25 + 2.25= 22.5

Anything more than a blank cover and you need a bigger boat.
 
Allright, I'm going to do a little guessing here. Do you mean 9 #12's counting the ground, or not?

3 12/2 cables is 6 #12 plus 1 EGC

6 x 2.25= 13.5
1 x 2.25= 2.25

15.75 cubic inches. If you actually have 3 12/2 cables, which I think you do, you are good to go with the deep box.



Otherwise, you will have to use a deep 4" square with a single plaster ring. I would do that anyway because you have more room for you splices.
 
Originally I would have had only 6 # 12-2 with ground but I found another 240V line in my wall I wanted to run into the thermostat box for possible future use. I really didn't want to go wqith a 4x4 box because I'm trying to keep my post(location of this box) as skinny as possible.
Is there a long skinny box out there that could give me the cu inches I need?
 
cdwirenut said:
Originally I would have had only 6 # 12-2 with ground but I found another 240V line in my wall I wanted to run into the thermostat box for possible future use. I really didn't want to go wqith a 4x4 box because I'm trying to keep my post(location of this box) as skinny as possible.
Is there a long skinny box out there that could give me the cu inches I need?
Click to expand...


I'm confused do you have conductors or 6 12-2 cables?
 
cdwirenut said:
Is there a long skinny box out there that could give me the cu inches I need?
Click to expand...


If there was it would be deeper than 3-1/2 inches and would not fit in a 2x4 wall
 
big vic said:
If there was it would be deeper than 3-1/2 inches and would not fit in a 2x4 wall
Click to expand...

I think he means vertically larger than a standard single-gang.

You know how the "behind the wall" old work boxes are where there's something like a second gang that "hides" in the wall? It sounds like he wants the "hidden" second gang below (or above ;) ) the opening.
 
cdwirenut said:
Originally I would have had only 6 # 12-2 with ground but I found another 240V line in my wall
Click to expand...

6#12-2= 13 conductors. Now I think you want to add one more #12-2 that would be 15 conductors. Is this what you are saying?
 
If it's 2x4 framing, how about a "thru-box" w/ blank cover on the other side? Or a couple of 122 boxes stacked & either facing the same way or opposite?
 
Yes I originally had (6) #12-2 conductors. now I have (2) more I want to add to the box. I like the idea about stacking boxes. Is that allowed or do i need a special stackable box?
What's the best solution for me, keep in mind I want to stay as narrow as possible & I'm working with the standard depth of a 2x4.
 
cdwirenut said:
Yes I originally had (6) #12-2 conductors. now I have (2) more I want to add to the box. I like the idea about stacking boxes. Is that allowed or do i need a special stackable box?
What's the best solution for me, keep in mind I want to stay as narrow as possible & I'm working with the standard depth of a 2x4.
Click to expand...


You still have not clearly stated whether or not you had six #12 conductors or six 12-2 cables.
 
infinity said:
You still have not clearly stated whether or not you had six #12 conductors or six 12-2 cables.
Click to expand...

I had (3) 12-2 w/gnd cables. Then after opening my wall I found (1) 12-2w/gnd cable. I want to add that to my box.
 
cdwirenut...I still don't get it.
Do you have a total of 8...12/2...CABLES that you want to splice in a box?
You say 12/2 conductors....that's confusing. I (personally) have never seen a 12/2 conductor.
steve
 
Please excuse my incorrect use of the terminology.
Ignore my assumption of the number of conductors & use this instead....

I had (3) 12-2 w/gnd cables going into my thermostat box. Then after opening my wall I found (1) 12-2w/gnd cable. I want to add that to my box.
 
So you have 8-#12 ccc and and 1 #12 egc as far as box fill is concerned.Then 2 for the device ,total 11. ( It was like pulling teeth.) :grin: so I think that puts you one wire over on the plastic carlon box.
 
celtic said:
CCC only affects conduit fill, not box fill.
Click to expand...

Ya but you know what I ment:wink: it made it easier to explain it that way.
 
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