how to wire a subpanel
A subpanel requires two hot wires connected to a 240-volt double-pole breaker in the main panel. It also needs a neutral wire and a ground wire. The cable used for this run is known as a “three-wire cable with ground.” The two hot wires, called feeder wires, will provide all of the power to the subpanel.
Why does a subpanel need 4 wires? The neutral and ground are not bonded in the subpanel.
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