Mounting the Box Mark and drill holes → fix box with expansion bolts. Keep box level and stable; use waterproof type if outdoors. Wiring Connections Strip wires → connect to terminals (phase, neutral, ground) → arrange neatly. Ensure tight contact, correct. In this guide, we'll break down everything you need to know to install a distribution box correctly and confidently. Check for proper IP/NEMA ratings and material quality. Residential line box: Compact in size, suitable for home electrical systems, used to distribute power for lighting, outlets, and household appliances. This article mainly talks about the first one. An electrical distribution box, also known as a power distribution box, panelboard, or consumer unit. Connection method: Each switch takes a wire from the incoming point and connects it to the incoming end of the switch, or uses parallel connection to reduce the difficulty of wiring. Wiring Direction: Wiring between the main circuit breaker and each branch circuit breaker in the box generally. 1) Generally, the incoming line of power distribution box adopts five wire system, that is, a, B and C three-way phase line (the general color is yellow, green and red), one way zero line (the color is light blue) and one way ground line (the color is yellow with green stripes).