1, before construction, there must be electrical (strong current, weak current), water supply and drainage design and construction drawings.

2. It is strictly prohibited to lay wires directly in walls, floors, floors or ceilings without any protection.

3, different voltages, different circuits, different signal lines are strictly prohibited to wear in the same threading pipe.

4, the installation of lamps and lanterns should be carried out after the completion of painting.

When installing lamps and lanterns on brick-concrete structures, it is forbidden to use wooden wedges, hooks, bolts or expansion bolts.

There shall be no less than 2 bolts (or screws) for fixing lamps.

Lamps and lanterns shall not be installed on combustible components.

5. The switch of lamps and electrical equipment must be installed on the "phase line" (that is, the control phase line), otherwise, after the switch is turned off, lamps and electrical equipment will still be charged, which is easy to cause electric shock.

6. There are two protection methods for power system: grounding protection and neutral point protection. At present, grounding protection is widely used in China.

Note that in the same system, it is forbidden to use two protection methods at the same time, otherwise it will cause safety accidents.