70 Amp Circuit Breaker Wire Size. Wire is sized by the american wire gauge awg system. Wire gauge refers the physical size.
The contractor doing the work is trying to tell me it is ok to use 8 wire for the common on a 107 foot run fed from a 70 amp breaker in the main panel in the house. That size is 4 copper or 2 aluminum. The most common household item that requires a 30 amp circuit is a central air conditioner often people living in rvs use 30 and sometimes 50 amp systems to run all the appliances in the vehicle.
You get this number by using a quality voltage drop calculator by specifying the breaker amperage and a wire length of 1 foot.
That would be. 1 foot to keep it from upsizing for distance by the way if the circuit was 55a breaker 60a that would be 6cu 4al. The contractor doing the work is trying to tell me it is ok to use 8 wire for the common on a 107 foot run fed from a 70 amp breaker in the main panel in the house. There is a mininum wire size which is required based on the circuit breaker rating.
