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Discussion Starter · #1 ·
The code says a square 4x1 1/2 box is 21in3.

How is this number figured out?
I would think its 4x4x1 1/2 but that comes up to 24.

I know I'm missing something but I can't figure out what. Thoughts?
 

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I think the numbers in the NEC are the inside dimensions so it is not quite what you think it is.
 
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