This project is a Class II high-rise building. The fire protection system is a Class II load, and the rest is a Class III load. The Class II load is powered by two-way power supply from the lighting or power distribution cabinet. Single circuit power supply is adopted for the third level load. According to the construction drawings, it can be divided into: low-voltage distribution system, grounding system, general lighting system, emergency lighting system, computer network system, television system, fire alarm system