Primary Distribution Box
The main power control center for construction sites or large facilities. It introduces three-phase power directly from the transformer to distribute high-capacity electricity to sub-panels.
Secondary Distribution Box
A sub-panel that receives power from the primary board. It is usually installed near specific floors or work areas to further split electricity for equipment.
Tertiary Distribution Box
A terminal switch box located near end-user equipment. It provides direct “one-machine-one-switch” control to ensure operational safety for a single machine.
