How to Install and Wire a SubPanel

More about Wiring a Sub Panel. Grounds and Neutrals in Electrical Panel; How to Wire Grounds and Neutrals in Sub Panels - all the neutrals and ground wire and terminal bars must be separated from each other, and your sub feed should be a 4-wire cable that has a separated insulated neutral wire and a separate ground wire.. Here, we have used a 240V cum 120V sub-panel that has a total current rating of 150A. So, both hot input lines from the sub-panel are connected to a 240V double pole, 200A circuit breaker in the main panel.

Sub Panel Connection. While installing a subpanel, an electrician generally first runs a feeder cable to the subpanel from the main panel.A three-wire cable with three insulated conductors and a bare copper ground wire is conventional. A 100-amp subpanel needs #4 copper wires or, more typically, #2 aluminum wires.. Tip: If there is no diagram on the panel, look up the make and model of the panel online to identify the bus bars. 5. Insert the red and black wires into the feeder breaker.. then route or extend the wires to the new panel. Use a wire cable to supply the sub panel from the main panel, and insert the conductor connections before re-installing.