How to configure a three-level distribution box reasonably

Choose the right box based on environment (indoor/outdoor), load capacity, and durability. Check for proper IP/NEMA ratings and material quality. The three-level distribution system refers to a system that distributes electric power through three levels of distribution devices from the incoming power line at the construction site to the electrical equipment. It contains multiple circuit breakers and connects various electrical circuits to ensure the safe flow of electricity throughout the building. Unlike single-phase systems, where power is distributed using. ontrol and circuit protection. As well as purely technical factors (intensity, number of outputs, etc. [pdf]