1. All kinds of buildings in the fire equipment power supply, fire elevator and other power supply;
2. Power supply of equipment and lighting system in important buildings or densely populated buildings, such as convention center, convention and Exhibition Center, hotel, airport, hospital, shopping center, parking lot and other urban complexes;
3. Places with high ambient temperature, such as steel plant, smelter, glass plant and other equipment power supply;
4. Flammable and explosive important occasions, such as: petrochemical, coal mine and other construction equipment power supply;
5. Health places requiring special cleaning, such as power supply for hospitals, food factories, etc;
6. Power supply for important military, national defense, aerospace and satellite base equipment;
7. Power supply for important equipment of power plant and nuclear power station;
8. Modern rail transit line power supply, such as: subway, high-speed rail, light rail, etc.