7 Electrical equipment and protection

 

7.1 Fire-fighting equipment

 

7.1.1 The main circuit of fire-fighting equipment such as fire pumps, spray pumps, water curtain pumps and smoke exhaust fans shall be provided with isolating appliances and shall comply with the following provisions:

 

1 The main circuit and the control circuit can share the same isolation device;

 

2 When the power supply line in the distribution box is provided with an isolating appliance and is installed side by side with the control box of the fire-fighting equipment, the main circuit of the fire-fighting equipment may not be provided with an isolating appliance.

 

7.1.2 The fire pump of one working mode should be equipped with a thermal relay. The thermal relay of the working pump acts on the trip and provides the start signal for the standby pump. The standby pump thermal relay acts on the signal alarm. When only one firefighting equipment is in operation, its thermal relay only acts on the alarm.

 

7.2 Elevator

 

7.2.1 The power switch of the elevator should not cut off the following power supply circuits:

 

1 Lighting and ventilation between the car and the pulley;

 

2 The power socket of the car top, machine room and pit;

 

3 hoistway lighting;

 

4 alarm device.

 

7.2.2 When the public building passenger ladder above 100m is used for fire rescue mission, the power supply shall be made of cable with the fire resistance not lower than NH2 in Appendix A. After the fire is confirmed, the passenger ladder will be used in the bottom layer or the conversion layer.

 

7.2.3 The lighting of the elevator shaft should be powered by 36V or 24V power supply. When using a 220V power supply, a residual current action protector with 30mA should be provided.

 

7.2.4 The lighting power supply of the elevator machine room should be taken from the emergency lighting power box, and should not be taken from the power box of the elevator.

 

7.3 Light fixtures

 

7.3.1 When switches, sockets, lighting fixtures and their supporting devices are close to combustible materials, fire protection measures such as heat insulation and heat dissipation shall be adopted.

 

7.3.2 High-temperature lighting fixtures such as tungsten halogen lamps shall not be installed in the storage place of combustible materials, and thermal insulation and fire protection measures shall be taken for the heat-generating components of the lamps.

 

7.3.3 Tungsten halogen lamps, incandescent bulbs with rated power greater than or equal to 100W, and lead-in lamps for recessed lamps shall adopt effective fire protection measures.

 

7.3.4 Incandescent lamps, tungsten halogen lamps, high pressure sodium lamps, metal halide lamps, fluorescent high pressure mercury lamps (including magnetic ballasts) greater than 60 W shall not be installed on flammable decoration materials or combustible components.

 

7.3.5 The fire performance of advertising light boxes for building exterior walls, subways and shopping malls suspended or roofed shall comply with the following requirements:

 

1 The burning performance of the power cord is not lower than the B1 level;

 

2 The lamp housing should be made of V0 material. When using V1 material, there should be protection measures and a fault arc protection device that can automatically cut off the power supply in the distribution circuit.

 

7.4 Other electrical equipment

 

7.4.1 The equipment and power cord material grades of electrical equipment, sockets (plugs), etc. with operating currents greater than 0.5A in the following locations shall not be lower than V0:

 

1 Public buildings with a building height of 100m and above;

 

2 cinemas and theaters with more than 1,500 seats;

 

3 Gymnasiums with more than 3,000 seats, shops and exhibition buildings with an area of ​​more than 3,000 m2;

 

4 tertiary hospitals and outpatient buildings;

 

5 Metro, dense underground areas with an area of ​​more than 1000m2, radio and television buildings, telecommunications buildings and financial and financial buildings at the provincial (city) level and above;

 

6 Other buildings with outdoor fire water consumption greater than 25L/s.

 

7.4.2 The outer casing and power cord material grades of electrical equipment, sockets (plugs), etc., which should be used in other types of public buildings and second-class public buildings other than those specified in 7.4.1, should be low. At the V1 level.

 

7.4.3 The electrical equipment, power sockets, etc. of the electrical equipment, sockets (plugs), etc. used in other buildings shall not be lower than the V2 class.

 

7.5 Power protection

 

7.5.1 The overload protection of the distribution line shall comply with the requirements of GB50054; for the distribution lines with large load changes during daily use, an overload protection device capable of automatically adjusting the protection current according to the load change shall be selected.

 

7.5.2 An electrical fire monitoring system shall be provided in the power supply line where the power supply load is the first level public building, the power supply load is the place where the electrical equipment is operated in the second and lower buildings, and the power supply line using the non-combustible cable in the singing and dancing screening game place. The setting of the electrical fire monitoring system shall comply with the provisions of the national current standard "Code for Design of Automatic Fire Alarm System" GB50116.

 

7.5.3 In places where electrical products are used, Internet cafes, refrigerators and electric water heaters in hotels, etc., where sockets are used for long-term use (plugs), sockets (plugs) with temperature measurement or fault arc protection should be used, or in sockets. (Insert row) The front end is provided with an equivalent protective device.

 

7.5.4 For lighting fixtures arranged above the ballroom, studio stage and other places with a space height greater than 12 m, a fault arc-type electrical fire monitoring detector (additional definition) shall be provided, and the end distribution box of other power supply lines shall be provided with Protection device for fault arc detection function.

 

7.5.5 In the medium and high voltage distribution cabinets equipped with electrical fire monitoring systems, temperature-measuring or pyrolytic particle-type electrical fire monitoring detectors should be installed.

 

7.5.6 Pyrolysis particle type electrical fire monitoring detectors should be installed in the power distribution cabinet.

 

7.5.7 The terminal distribution box of the stall-type appliance shopping mall, wholesale market, bazaar market, etc. shall be equipped with a current-limiting electrical fire protection device or a fault arc-type electrical fire monitoring detector; a storage warehouse, an electric vehicle charging station, etc. The terminal distribution box shall be provided with a current-limiting electrical fire protection device; a flow-limiting electrical fire protection device shall be installed in the place where daily power consumption is required.

 

7.6.7 Distribution lines for insulated and residual current electrical fire monitoring detectors shall not be provided. Portable measuring electrical fire monitoring detectors or residual current room electrical fire monitoring detectors shall be provided for temporary monitoring of wiring.

 

 

 

Appendix A Fire Resistance Requirements for Wire and Cable

 

A.1 Fire-fighting equipment distribution lines use wire and cable to meet national standards GB/