The right size of copper wire for a 400 amp service is 600 kcmil. So, depending on these features, the wire size differs due to the material quality. It has better conductivity, resistance, and corrosiveness than aluminum wires but is not as good as copper. On the other hand, aluminum wires are not that good in conductivity, resistance, or corrosiveness.Īluminum is good for shorter distances, cheap, and lightweight. That will save the wire from corrosion without affecting the wire. You can use the wires in whatever way you want because there is no fear of breakage.īesides, the wires have a green tarnish layer called Patina, which gets oxidized if the wires are exposed for longer periods. The wires can carry enough current for longer distances without getting overheated. They are higher in conductivity, heat resistance, corrosion, and strength. There are multiple wire materials, but the three most used wires for electrical purposes are:Ĭopper wires are the most favored wires for electrical purposes. These factors will determine the right wire size for a 400 amp service. The right size of wire for a 400 amp service is 1,000 kcmil.īut, the actual size varies depending on various factors. What is the right wire size for 400 amp service? Should you use ground rods for 400 amps service?.A table of different wire sizes for 400 amps service.NEC Voltage Drop Calculator for 400 Amp Service.What is the NEC Volts-Ohm’s Law for a 400 amp electrical service?.What is the danger of using the wrong wire size?.
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