Before starting, turn off the main breaker in the main panel to disconnect power. Never work on live circuits, and ensure the area is dry and free from conductive surfaces. Use insulated tools and follow all local electrical codes .
Install the subpanel in a convenient, accessible location, typically on a wall or post. Ensure it is securely mounted and complies with NEC clearance requirements: at least 3 feet of clear working space in front, 30 inches wide, and extending from the floor to 6.5 feet .
From the main panel, run a feeder cable consisting of:
Install a double-pole breaker in the main panel to feed the subpanel. Connect the two hot wires to the breaker, the neutral wire to the main panel's neutral bus, and the ground wire to the main panel's ground bus .
Inside the subpanel:
Install breakers in the subpanel for the circuits you intend to power. Ensure that 120V circuits are connected to one hot wire and neutral, while 240V circuits use both hot wires .
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