What is the largest breaker I should use on 12 gauge wire? How about 14 guage wire?
Can 10 gauge wire handle a 30 amp breaker?
30 amp breaker with 10g wire is usually what is used for an electric water heater.
Are you asking for a specific appliation, or just fishing for information?
If using ROMEX® those answers are correct but if its not ROMEX® it depends on the wire insulation type and if it needs to be derated.
Last edited by Terry; 12-07-2011 at 10:11 AM.
Yes my bad I don't know what I was thinking maybe flexible cords?
You have not specified what type load and what type overcurrent protection is provided ie. (circuit breaker or fuse) the #12 conductor is supplying. If the circuit is supplying a motor load, the NEC allows a CB or Fuse rated greater than the conductor ampacity.