On 2004-10-11, J T wrote:

And, you'd probably be violating code if you used 1/2" EMT technically,
since you can't legally install 12/2 (and probably not even 14/2) in 1/2"
EMT due to fill limits.

Actually, I don't believe this is true. With a single cable, the NEC
allows 53% conduit fill, and 1/2" EMT has an interior diameter of
about 5/8". This yields 0.161 in^2 of usable area. The 12/2 NMB
cable sample I measured is 0.39" x 0.18", and it has to be treated as
a circle of diameter 0.39". This yields a cross-sectional area of
0.119 in^2, which is less than 0.161 in^2. BTW, my sample of 12/3 NMB
cable has a diameter of 0.37", so a single 12/3 NMB cable is OK too.
I don't have a sample of 12/4 here.

Cheers,
Wayne