Open Knockouts in Box: as well as for each branch circuit that will enter the breaker box. Yet another knockout may need to be opened for the main grounding wire. The knockouts are the round metal discs visible in the top, bottom, sides, and back of the box—of various sizes to match different-sized conduits that may need to connect to the box. the branch circuits later, as individual circuit wires are run.

Install the Main cable with neutral: The main service cable is secured laying- Plenty of excess wire is pulled into the panel to allow for connections to be made anywhere in the panel., Cable glands used for armored cables are to be of brass compression type, complying with BS 6121 and BS EN 50262: Part I, with earth tag and PVC shroud. and termination, the bus bars shall be mounted on non-hygroscopic insulators and shall withstand the rated short circuit level. The neutral bar shall be provided with a separate terminal for each incoming and outgoing feeders. A separate earth terminal block shall be provided which shall have a separate terminal for each feeders. All phases shall be identified and separate circuits shall be labeled

Connect the Main Ground Wire: This main ground wire is usually connected to a grounding rod.

Pull wire/cable for Branch Circuits: Pull the wires for the various branch circuits into the panel. If they arrive at the panel through a metal conduit/trays/trunking,

Connect Branch Circuit Ground Wires: To connects all of the yellow-green and bare copper wires for the branch circuits to the ground bus bar inside the panel.

Connect the Branch Circuit Breakers: The circuit breaker for each branch circuit is now connected, one at a time. The breakers have been carefully chosen to match the required amperage and voltage of the circuits and to meet code requirements.