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10
It is easy to put a 2-inch long piece of conduit that is less than half an inch in any cross-sectional measure into a half-inch conduit.
9
11
4
10
Three number three wires can be installed in an inch and one quarter conduit.
30 pairs
The NEC allows 26.
2 inch
1 1/2 inch
9 - Is this a test answer or do you just want to know for a project you're doing? Take a look at NEC chapter 9 - tables 4 and 5 (in the 2005 edition at least)
It is easy to put a 2-inch long piece of conduit that is less than half an inch in any cross-sectional measure into a half-inch conduit.
4 inch rigid conduit
Actual hole size for 1 inch conduit is 1.362"
4 inch rigid conduit
50 mm or 2 inch will handle the 3/0 wires for a 200 amp service.