Box-type substation is a relatively simple power distribution equipment, transformers choose their part, may by general regulations treatment capacity is generally not more than 1250kVA.

Applicable to urban public distribution system, in residential areas, busy streets when the load increases, the need to increase transformer capacity; temporary power construction site, there are circumstances under buildings need renovation or increase electrical equipment, field work and outdoor workplaces the power supply, such as oil, mining, ports, railway stations and so on.

Simple lighting, public distribution, the high voltage junction box changes do not have to set up high-pressure metering program, set only low voltage measurement or no metering, no compensation. Outgoing circuits 4 to 6 times, the use of plastic breaker control and protection;

Public distribution under dynamic lighting, the box becomes a loop with an increase of up to 8 to 12 times, in addition, there should be no power compensation;

Self-dimensional power and exceptional circumstances.