Connect the input and output wires to the corresponding terminals of the distribution box. This usually involves using expansion bolts or screws to securely mount the cabinet to the wall. Ground. An electrical panel box, also known as a breaker box or a distribution board, is a crucial component of any electrical system. It serves as a central hub for distributing electricity throughout a building, ensuring that power is delivered safely and efficiently to all the required locations. Check the power supply: Check whether the power input is normal.