Each switch box shall connect to and control only one associated piece of electrical equipment (including sockets). According to the hierarchical and branch circuit principle, in a three-level distribution system, no electrical equipment shall be connected by bypassing. Electrical equipment is installed under the switch box, forming a three-level distribution. Neither the main. The terms primary, secondary, and tertiary distribution boxes are relative. From the transformer's low-voltage side (0. Distribution Overview In a typical. It's better to replace the 2. Three level distribution: That is, a distribution electric box is arranged under the general distribution box, and a switch box is arranged under the switch box, and electrical equipment is arranged under the switch box to form a three-level distribution. Many factories and businesses use these boxes to run things like motors, air compressors, and heaters. Big buildings with many floors.
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