They know that 4-gauge conductors can transmit 70 to 85 amps of current without overheating. You need a gauge that can withstand that spike, which is why most electricians use 4AWG copper wire for 70 amps. Some appliances will double or even triple their electrical draw when they start. But that is not an excuse to use thin wires. The NEC encourages consumers to limit the load to 80 percent of the circuit’s capacity. Your choice will influence the safety and security of your home. Therefore, you should select the breaker wire carefully. They will overheat and melt long before the 60-amp breaker trips. If you force the wires to carry more than 60 amps, the 60A breaker will trip, preventing the wires from overheating.īut what if the wires are just 10AWG? 10-gauge cables can withstand 35 to 40 amps. The breaker is supposed to protect the cables.įor instance, 6AWG is suitable for 60A breakers. Also, match each breaker to the correct wire size. If you prefer the cheaper option, get 2AWG aluminum cables. 30 Amp Breaker Wire Size(110v, 120v, 240v, Single & 2 Pole)įor a 70-amp breaker, you need a 4-gauge wire, but only if the conductors are copper.80 Amp(Breaker, Ground, Service) Wire Size Explained.50 Amp Wire Size Chart (120, 240, 480V) With Single,3 Phase.Wire size for 70 Amp 3 Phase Volt with 70 Amps Let’s check the wire size for 3 phase with a distance of 150 ft. This wire size may change depending upon the required voltage, ambient temperature, voltage drop, distance, location and material used. Otherwise, the wrong wire size will burn your house down.
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If it doesn’t, you should update the wiring in your home before you install a new breaker. If you know the wire size that accommodates 70 amps, you can determine whether or not your existing wiring matches that wire size. But you cannot answer that question without first identifying the correct wire size for a 70A breaker. If you want to upgrade your breaker to 70 amps, you are probably wondering whether the wires can stay the same.
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