In this guide, we'll break down everything you need to know to install a distribution box correctly and confidently. Choose the right box based on environment (indoor/outdoor), load capacity, and durability. Check for proper IP/NEMA ratings and material quality. It takes the incoming power and safely distributes it to different circuits throughout your building. It is mainly used to isolate fault circuits, prevent overload, and ensure the safe operation of. A distribution box, also known as a fuse box or power distribution box, is the heart of the domestic electrical installation.