1. Distribution system should be the distribution cabinet or the total distribution box, distribution box, switch box three-level distribution mode.

2. The total distribution box should be located near the area of the power supply, distribution box should be located in the area of electricity equipment or relatively concentrated load, distribution of the box and the switch box distance must not exceed 30m, switch box and its control of the fixed type of electrical equipment should not exceed the horizontal distance of 3m.

3. Each electric equipment must have their own special switch box, strictly prohibit using the same switch box directly control two and more than two electrical equipment (including sockets).

4. Distribution box, switch box (including accessories) should be installed correct, solid. The vertical distance between the central point and the ground of the fixed distribution box and the switch box shall be 1.4~1.6m. The movable distribution box and the switch box should be installed on the solid and stable bracket, and the vertical distance between the center point and the ground should be 0.8~1.6m.