Inside the box, you'll find things like circuit breakers, busbars, terminal blocks, and wires. These parts control and distribute the electricity to different circuits safely. However, the key to. In modern electrical systems, cable distribution boxes (also known as electrical distribution boxes or distribution boxes) play a crucial role as the key hub for managing, distributing, and protecting circuits. Follow this guide for a clear and safe connection process: Before starting, always ensure the main power is turned off to avoid electrical shock. Most of the concealed wires are through pipes and hidden in the building wall or decorative wall.