Wire size
#1
Wire size
I am running additional circuits to some bedrooms in my house. I was given 3 - 100' rolls of 12/2 wire. What I would like to know is if it is permissable to use 12/2 wire on a 15 amp circuit?
#3
Since you have the wire already just install a 20 amp breaker and get 1/3 more capacity for no additional cost.
#4
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Keep in mind that all J-boxes must fit the size of the wire, regardless of derating the circuit. If you are using old or existing boxes, they are likely too small. NEC 314.16
And a bedroom circuit may require an AFCI breaker, check local code.
And a bedroom circuit may require an AFCI breaker, check local code.