![]() Even though copper is considered a superior conductor, it is still cheaper, lighter, and more flexible than aluminum.įor copper wiring, you’ll need a #4 AWG copper wire that is commonly used for electrical wiring since it is more heat resistant than aluminum. At the connection terminals, copper-clad aluminum does not need an antioxidant layer.Īluminum wiring appeals to many since it is less expensive, lighter, and more flexible than copper. To resist corrosion, the connection terminals of aluminum wiring require an antioxidant coating. You’ll need a #2 gauge wire for both aluminum and copper-clad aluminum wire. Many licensed electricians use #2 copper-clad or aluminum wire size. Because aluminum wiring has a lower conductivity than copper, it requires a larger diameter wire. The following table reflects wiring size, length, and voltage drop: Service or Feeder Rating Copper Wire Aluminum orĬopper-Clad Aluminum Wire Minimum Conduit Size 100 Amps #4 AWG #2 AWG 1.25 inch 110 Amps #3 AWG #1 AWG 1.25 inch 125 Amps #2 AWG #1/0 AWG 1.25 inch 150 Amps #1 AWG #2/0 AWG 1.25 inch 175 Amps #1/0 AWG #3/0 AWG 1.5 inch 200 Amps #2/0 AWG #4/0 AWG 1.5 inch 225 Amps #3/0 AWG 250 kcmil 1.5 inch 250 Amps #4/0 AWG 300 kcmil 2 inch 300 Amps 250 kcmil 350 kcmil 2.5 inch 350 Amps 350 kcmil 500 kcmil 3 inch 400 Amps 400 kcmil 600 kcmil 3 inch Source: National Electrical Code ![]() Which wire used is determined by the voltage drop and length of the wiring. ![]() AWG, American Wire Gauge, is the US standard for sizing electrical wiring.Ī 100 amp breaker panel requires either #4 copper wiring or #2 aluminum or copper-clad wiring. ![]()
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