We make it easy for you to add circuits with our step-by-step guide to installing an electrical subpanel.
A subpanel connects to the main service panel with a thick three-wire cable.
The feeder breaker in the main panel acts as the main disconnect for the subpanel.
Credit:BHG / Kevin Norris
Before installing a subpanel, consult with an inspector to verify you do not overload your overall system.
A subpanel has separate bus bars for neutral and ground wires and typically has no main breaker.
It may not be labeled “subpanel.”
Credit:BHG / Kevin Norris
Instead, it might be labeled “lugs only.”
Additionally, it might be a different brand than the main panel.
Safety is most important when installing anything with wires or electrical work.
Credit:BHG / Kevin Norris
Remove a knockout slug, slide the wires through, and clamp the cable.
Strip the sheathing, remove a knockout slug, and clamp the cable.
Route the neutral and ground wires carefully and connect them to their bus bar(s).
Credit:BHG / Kevin Norris
Strip Wires
Route, cut, and strip the red and black wires.
Connect them to the feeder breaker.
Snap the breaker into place.
Credit:BHG / Kevin Norris
Finish Connecting Wires
Run cable for new circuits into the subpanel and clamp the cable.
If the subpanel is on a separate building, it needs a ground bar.
Credit:BHG / Kevin Norris
