These are MCBs, RCDs, busbars, and the main switch. Each part helps keep your electrical system safe. Inside, you'll find parts like circuit breakers and fuses that protect the system from problems like overloads and short circuits. It ensures that electricity flows. The distribution box (DB box) helps safely and efficiently distribute electrical power. If you know. MCCB is used for making and breaking incoming power where ACB incomer supply is connected with LT panel and outgoing is connected with APFC panel busbar. MCCB is used for making and. This guide covers split load vs dual RCD vs RCBO board configurations, circuit arrangement and allocation, BS 7671 labelling requirements, type testing under BS EN 61439, SPD installation, wiring best practice, and the common mistakes found during EICR inspections. “ I've won two contracts this.