Three-level distribution box directly plugs into electrical equipment
The system typically starts at the power distribution cabinet or room, then passes through a secondary distribution box (also known as a sub-panel) and finally reaches the switch box (the third level), which connects directly to the electrical equipment. In a newly constructed residential area, a 10kV power line is introduced into the substation. Generally, first level distribution does not allow direct use of electrical equipment, and second level distribution will be by power equipment because it is three-phase electricity, while third level distribution is mains electricity (220V). A three phase distribution box controls and guards electricity in three-phase power systems. This section concentrates upon commonly used power distribution equipment: Panelboards, Switchboards, Low-Voltage Motor Control.
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