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Old 03-07-2012, 10:18 PM   #1
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1 Gang Boxes


Whats the difference between 20 and 22.5 cu. in. 1 gang boxes??? When and how does 2.5 cu. in. come into play???
These are the two boxes available at HD...

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Old 03-07-2012, 10:29 PM   #2
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Wire rule,more room more wires.

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Old 03-07-2012, 10:30 PM   #3
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The bigger box is deeper and allows more wires to be installed in the box.
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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 03-07-2012, 10:39 PM   #4
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Quote:
Originally Posted by Jim Port View Post
The bigger box is deeper and allows more wires to be installed in the box.
So a simple 12/2 in and 12/2 out receptacle would not require the 22.5 cu. in. box, correct?
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Old 03-07-2012, 10:46 PM   #5
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Two 12-2 cables + a receptacle would have a conductor count of 2+2+1+2 for a total of 7 allowances of 2.25. Your box would only need to be 15.75 cubic inches or larger.

In the explanation above the ground only counts once, the device counts as two. No allowance was made for a clamp.
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