The cable must contain one or two hot wires depending on your needs, one neutral wire, and one ground wire. When it comes to the lines connecting master and secondary panels, where the line will carry as much as a full 100 amps, use a 2-gauge non-metallic sheathed electrical cable. What size wire do I need for 100 amp service 100 feet away? What size service entrance cable do I need for a 100 amp service? SERVICE ENTRANCE CONDUCTORS SIZE AND RATING It’s very common to see a 100 amp breaker in a 480 panel feeding a 75 KVA transformer and a 225 amp main in the 120/208 panel. What size transformer do I need for a 100 amp panel?
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