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Old 06-10-2010, 06:23 PM   #1
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box fill


Hello

I have purchused two 3-way dimmer switches which I would like to install in my basement. Each dimmer has 3 wires plus a grd wire, so I have no problem connecting the circuit, my problem is with the amound of caps I can have in a 36 cu inch dual gang plastic box. I have to connect each wire from the switch X2 plus tie the neutrals together and the grounds together.

Currently I have 9 caps in the box, the only guide I have says you are only allowed 5 caps in a dual or tripple gang box?

I am in ontario Canada, and help with this would be appriciated
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Old 06-10-2010, 06:38 PM   #2
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How many wires coming into box?
What is the thickness of the dimmer?
What is the gauge of the wire?
The 9 nuts counts as 4 wires. That size box is allowed 20 #14 wires and 17 #12 wires. It doesn't sound like you are even close to that count.
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Old 06-11-2010, 12:47 AM   #3
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Thanks for the response, I have ten 14-2 wires coming into the box (two 14-3 cables and two 14-2 cables). The dimmer itself is about an inch and a half thick. I beleave the 3 wires comming off each dimmer do not count as bow fill am I correct? So that would give me a wire counnt of 14...can I ask where your information is from?

Thanks
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Old 06-11-2010, 07:39 AM   #4
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I will let Joe answer as far as the CEC rules, but a correction. You do not have 14-2 wires into the box, these are cables. Box fill is based on conductor count.

Under the NEC 2 x 14-3 = 6
2 x 14-2 = 4
+ 1 for ground = 11 #14's
+ 2 x 2 conductors for each device
_____________________________________
= 15 # 14s, + clamps if applicable
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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 06-11-2010, 07:58 AM   #5
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My info is from the table(22 I think) in the code book. It has a list of standard box sizes and the closet one to your CI(30 ci) had those wire counts. The code also has the calculation for deduction of cubic inches for thick devices like your dimmer.

You are correct the dimmer wires don't count.

Code book is at home. I will give more detail later.
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