Connects to end-use equipment via switch boxes, forming a three-tier power distribution system. Residual current devices (RCDs) at both the tertiary (equipment-level) and secondary (zone-level) stages. Ensures safe disconnection in case of faults or leakage currents. Our system distribution boxes can accommodate all the components of building automation and offer pluggable interfaces to the field level for fast and error-free installation. The following is a detailed introduction about it: - **First-level Distribution. ew buildings and retrofit measures. High-quality materials and robust product designs ensure a reliable connection, signal transmission and power. Third level distribution box: refers to the final junction box of each electrical appliance, which can be movable and fixed.