breaker size for 12 gauge wire

whoazone · Jul 15, 2008

What is the largest breaker I should use on 12 gauge wire? How about 14 guage wire?

Jbfan74 · Jul 15, 2008

whoazone said:
What is the largest breaker I should use on 12 gauge wire? How about 14 guage wire?

#12=20 amp breaker
#14=15 amp breaker

Sponsor · 2022-01-29T12:20:58-0800

whoazone · Jul 15, 2008

Can 10 gauge wire handle a 30 amp breaker?

Speedy Petey · Jul 15, 2008

whoazone said:
Can 10 gauge wire handle a 30 amp breaker?

Basically, yes.

Mike Swearingen · Jul 16, 2008

30 amp breaker with 10g wire is usually what is used for an electric water heater.
Mike

hj · Jul 16, 2008

wires

Are you asking for a specific appliation, or just fishing for information?

pudge565 · Jul 17, 2008

If using ROMEXÂ® those answers are correct but if its not ROMEXÂ® it depends on the wire insulation type and if it needs to be derated.

Chris75 · Jul 17, 2008

pudge565 said:
If using ROMEXÂ® those answers are correct but if its not ROMEXÂ® it depends on the wire insulation type and if it needs to be derated.

What are you talking about? Try reading 240.4(D)

pudge565 · Jul 27, 2008

Yes my bad I don't know what I was thinking maybe flexible cords?

Johnny C · Oct 20, 2008

Breaker size for # 12 wire

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.

breaker size for 12 gauge wire

whoazone

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Jbfan74

Electrical Contractor

Sponsor

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whoazone

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Speedy Petey

Licensed Electrical Contractor

Mike Swearingen

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hj

Master Plumber

pudge565

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Chris75

Electrician

pudge565

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Johnny C

Electrician

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