You will need all three wires, namely Hot 1 (Line 1 from the 1-Pole Breaker), Neutral from the Neutral busbar, and Ground from the ground terminal, as illustrated. Wiring Installation of a 100A Subpanel for Only 120V Finally, the electrician installs the feeder breaker in the main service panel’s open double slot.Ĭonsequently, separate circuit breakers for the additional circuits then become ready to be fitted in the subpanel.
Next, the electrician connects the hot feeder wires to a new 240-volt circuit breaker at the main panel and then attaches the neutral and ground wires from the feeder cable to the respective bus bars in the main panel. The electrician attaches the two hot wires from the feeder cable to the lugs on the hot bus bars in the subpanel, connects the neutral wire to the neutral bus bar, and the bare copper grounding wire to the grounding bus bar. A 100-amp subpanel needs #4 copper wires or, more typically, #2 aluminum wires.
A three-wire cable with three insulated conductors and a bare copper ground wire is conventional. While installing a subpanel, an electrician generally first runs a feeder cable to the subpanel from the main panel. However, it is always advisable to call an electrician to avoid any risk. There are certain ways of 100 Amp Panel wiring which are explained below.
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