This paper comprehensively analyzes the application of building electrical design in engineering buildings through practical cases, and discusses the key points and precautions in high-rise building electrical design in combination with various requirements. With the continuous development of China's economy and the continuous improvement of people's living standards, high-rise buildings are becoming more and more. However, due to the continuous development of high-rise buildings, the application of building electrical must be more strict. In individual projects, Due to the gap in the understanding of the specification by the construction personnel, it brings inconvenience to the users of high-rise buildings, and some leave hidden dangers for the project. This paper puts forward some views on the application of building electricity in high-rise buildings.

1. Selection of power supply

Due to the large building area, concentrated power load and high requirements for power supply quality of high-rise buildings, in order to ensure the reliability of power supply, high-rise buildings should ensure that there are at least two independent power supplies, which can supply power simultaneously and serve as backup for each other. Types of two independent power supplies: the first is introduced from two independent 10KV incoming power supply lines to the substation. The second is to use one normal low-voltage incoming working power supply (mains power supply) and the other as standby power supply to ensure uninterrupted power supply for important electrical equipment in the building. Standby power supply mode: diesel generator set, EPS power cabinet and electrical appliances are equipped with battery charging device.

2. Selection of substation location

(1) The power consumption of modern high-rise buildings is quite large. The location of the substation should make the high-voltage go deep into the load center as far as possible.

(2) Avoid places with severe vibration, and do not set in places with much dust, water mist or corrosive gas.

(3) It shall not be located under or next to the toilet, bathroom or other places where water often accumulates.

(4) It should not be located directly above or below places with high fire risk. When temporary partitions are posted, the fire resistance rating should be Grade I, the doors should be Grade A fire doors, and there should be doors leading directly to the outdoors or public corridors.

(5) The distribution substation shall not be located in geothermal low-lying areas or places where water may accumulate. When the distribution substation is located in the basement of a high-rise building, it shall not be located at the bottom floor. When there is only one underground floor, waterproof measures such as properly raising the ground shall be taken. Many examples prove that when the distribution substation at the bottom of the highest building is installed, because the underground waterproof is not well done and the reserved holes are not tightly blocked, the substation is flooded with water, especially when a large amount of water is used in the upper layer during the fire fighting process, the substation will also be flooded with water, affecting the safe operation of the substation.