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What is the smallest copper wire size permitted by the national electric code for a 20 amp single phase electrical circuit?
I think you mean either what is the correct size or minimum wire size needed when a branch circuit is protected by a 20 A breaker. The size is 12 American Wire gauge (AWG). 14 AWG is used for 15 A circuit and 10 AWG for a 30 A breaker. The lower the gauge the larger the cross-section of the wire.
What is the equivalent of 14 AWG standard wire in UK?
14 AWG wire has a cross-section of 2.07 square millimetres so can be used up to a limit of 15 amps.
Is the wire running to a 20amp breaker different from a wire running to a15amp breaker?
Yes, a 20 amp breaker requires AWG # 12 copper wire. A 15 amp breaker requires AWG # 14 copper wire.
How big of breaker do you use for 115 volt?
Depends on the wire size used in the circuit. If you use AWG # 14 wire you must use a 15 amp breaker. If it is wired with AWG # 12 wire then you use a 20 amp breaker. If a AWG # 10 wire is used then a 30 amp breaker is required. The breaker protects the wiring from overheating so you must use the proper size breaker for the wire used.
What is the Minimum branch circuit wire size in a dwelling?
The minimum size home wiring is #14 AWG, the rating for that size wire is 15 amps.
