How to wire the distribution box of commercial property facing the street on the third floor (three-phase electricity)

Three-phase electricity is a three-phase line, and the voltage between the three lines is 380v, which is used for three-phase power supply equipment such as three-phase motors; Two-phase electricity is a two-phase line, and the voltage between lines is also 380v, which is often used in AC welding machines. Single-phase electricity is composed of a phase line and a neutral line with a voltage of 220v, which is mainly used for household appliances.

1.3, air switch

1.5, electric meter (electric energy)

Household single-phase power meters, model DD, include mechanical meters, ordinary electronic meters and magnetic card electronic meters, with specifications of 1.5(6), 5(20), 10(40), 15(60) and 20(80). Electronic watches and mechanical watches of the same specification can carry different powers. For example, the prepaid electronic watch (ic card) of 10(40)A can carry about 8800W, while the actual carrying power of the mechanical watch and ordinary electronic watch of 5(20)A is much higher than that of the magnetic card electronic watch of10 (40) A.

Above12000 w w. Therefore, the above three tables must be treated differently!

The power of magnetic card electric meter (ic card) can sometimes be adjusted artificially, such as ic card electric meter of10 (40) A.

The rated carrying power of is 8800W, but the power department can set its actual using power below 8800 W..

. When users use this kind of meter, they can go to the power department to adjust the power setting as needed.

2, three-phase electricity knowledge

2. 1 Three-phase electrical load wiring is divided into triangle wiring and Y-shaped wiring. The load leads connected in a triangle are three live wires and one ground wire, the voltage between the three live wires is 380V, and the voltage between any live wire and the ground wire is 220 V; Y

The load leads of the former connection mode are three live wires, zero wires and ground wires, and the voltage between the three live wires is 380 volts, and the voltage between any live wire and the zero wire or ground wire is 220 volts. ..

Total power of three-phase electrical appliances