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Receptacle Box Capacity

1K views 8 replies 4 participants last post by  electures 
#1 · (Edited)
Hello all! I have a question that I can't seem to find the answer to. I am wiring a bedroom and am trying to determine if I can wire a receptacle and junction out to another receptacle box and an exterior motion light. Basically, I want to feed a deep single gang receptacle box for the receptacle. My question is can I then junction out to another receptacle down the wall about 8 feet, but also junction up to an exterior motion light? Can all of these wires be in a deep box? I do not understand how the NEC calculates number of conductors and air space. I understand it, but it doesn't satisfy me with my question of whether I can do this or not.

This is in a bedroom that is in the corner of my house adjacent to the front sidewalk.
 
#2 · (Edited)
Calculations based on cubic inches of box and wire guage. NEC Table 314.16(b)

22.8 cu in. non-metallic box using 14/2 wire = 11 conductors.
count 2 for wiring device, 1 for each colored wires, 1 for clamps (if needed), all grounds combined =1

if im not mistaken;)
 
#6 · (Edited)
crater13bravo said:
Metal 2x3x3-1/2. 12-2 with ground
Your box is not big enough.
3 whites
3 blacks
1 all grounds
2 device
1 clamps

10 conductors

Box is rated for 8 conductors
 
#9 ·
MisterZ said:
Switch to plastic. They are a bit larger, and no need to ground the box;)
The deep plastic box is 20,5 cu in. Since there are no clamps it will work.
 
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