6 Cable selection and laying
6.1 General provisions
6.1.1 Types and laying of distribution lines, control lines and electronic information system lines for daily electrical load should be selected according to the toxicity of the cable, the density of smoke, the possibility of fire and the spread of fire, and the evacuation of personnel. the way.
6.1.2 The type of fire-fighting cable and the method of laying shall be selected according to the requirements of the fire-fighting equipment for continuous working hours in case of fire.
6.1.3 Cables that meet the type of demand should be selected first; when the cable that meets the requirements is not available, the highest level of cable that can be obtained should be selected and the appropriate laying method should be selected to meet the requirements.
6.1.4 Fire-fighting equipment distribution and control lines shall be copper core fire-resistant cables.
6.1.5 The distribution lines of fire-fighting equipment shall meet the requirements for the continuous operation time of fire-fighting equipment in the event of fire.
6.1.6 The horizontal branch line of the fire-fighting equipment distribution system should not cross the fire compartment.
6.1.7 Evacuation stairwells, evacuation walkways, and refuge floors (between) should select cables with a toxicity of t0 or select ordinary cables and embed them in a non-combustible structure.
6.1.8 There should be no connectors in the cable trough and bridge.
6.1.9 The tapping of the cable should not be used for the tapping of the cable; for the cable that needs to be branched, the pre-branch cable should be used.
6.2 Fire equipment distribution and control cable selection
6.2.1 Fire-fighting mains laid in the shaft of high-rise buildings shall adopt the cables required by NH1 in Appendix A.
6.2.2 The power supply lines for fire-fighting pumps, fire-fighting elevators and evacuation passages on high-rise buildings shall be equipped with cables complying with the requirements of NH1 in Appendix A; power supply for spray pumps, smoke control fans and fire emergency lighting. The line can be used with the cable complying with NH2 in Appendix A; the fire shutter and the pressurized water pump can be used to meet the NH3 grade cable in Appendix A.
6.2.3 The power supply lines of the fire-fighting pumps, fire-fighting elevators and evacuation passages on the second-class high-rise buildings shall be equipped with the cables complying with the NH1 class in Appendix A; the fire-resistant bridges may also be used in accordance with the NH2 class in Appendix A. Cable. Sprinkler pumps, smoke control machines, pressurized blowers and fire emergency lighting, fire-proof partitioning fire curtains and pressurized water pumps shall be supplied with cables complying with NH3 in Appendix A.
6.2.4 When the building is a single-storey or multi-storey building with a height of 24m or less, the power supply mains of fire-fighting equipment such as fire elevators may use the cable complying with NH1 in Appendix A; when the building is a multi-storey building with a height of 24m or less, and the building area When the temperature exceeds 100,000 m2, the mains supply for fire-fighting equipment such as anti-air-lifts shall comply with the provisions of 6.2.2.
6.2.5 When the low-voltage diesel generator room and the substation are not adjacent, the cable conforming to the NH1 class in Appendix A shall be used.
6.2.6 The substation to the electrical shaft shall be fitted with a cable complying with the NH1 class in Appendix A.
6.2.7 Cables complying with NH1 in Appendix A shall be used between electrical shafts to distribution rooms and fire-fighting equipment.
6.2.8 Cables leading from the distribution substation or main distribution room to the terminals of the fire service equipment shall be of the power line complying with the NH1 class in Appendix A.
6.2.9 In the equipment room, the branch line and control line from the control box to the fire-fighting equipment may be equipped with fire-resistant wires or cables that are lower than the fire-rated main line.
6.2.10 The combustion performance of the busway for the distribution of fire-fighting equipment shall be in accordance with the above-mentioned requirements for the combustion performance of the corresponding fire-fighting line.
6.2.11 The power supply line of the emergency lighting system should be selected to meet the wire and cable of NH3 in Appendix A.
6.3 Selection of power distribution and control cables for non-fire equipment
6.3.1 Cable selection of various types of places in civil buildings shall comply with the following provisions:
1 For super high-rise buildings with a building height of more than 250m, cables with a combustion performance of not less than Class A and a smoke toxicity of t0 should be used.
2 When the daily power lines of public buildings with a building height of more than 150m but not more than 250m are laid in the same shaft as the fire-fighting power supply line, wires and cables with a burning performance not lower than Class A and smoke toxicity of t0 should be selected; daily electricity consumption When the line and the fire-fighting power supply line are not laid in the same shaft, the wires and cables with the burning performance not lower than the B1 level and the smoke toxicity to t0 level shall be selected;
3 Buildings with a building height of more than 100m but not exceeding 150m and financial and financial buildings in a type of high-rise building, provincial power dispatching buildings, provincial (city) level radio and television, and telecommunication buildings shall use combustion performance B1 and smoke toxicity. A cable of class t1, burning drip/particle grade d1. The wire should have a combustion performance of not less than B2, a smoke toxicity of t2, and a combustion drip/particle grade of d2;
4 Other types of public buildings and personnel-intensive public places shall select wires and cables with a combustion performance not lower than B2, smoke toxicity t2, and combustion drip/particle grade d2;
5 For refuge floors, refuge rooms and wooden structures, cables with a burning performance of Class A and smoke toxicity of t0 should be used. The wire for clear application should be selected to have a combustion performance not lower than B1, and the toxicity of smoke is t0. a wire with a falling object/particle level of d0;
6 Cables with a combustion performance not lower than B1 and a smoke toxicity of t0 should be used in underground buildings where long-term detention is required.
6.3.2 When the distribution line of the distribution line in the bridge is not covered by the non-metallic content and cannot meet the requirements of flame retardant, the cable whose combustion performance meets the requirements of B.1 in Appendix B shall be selected.
6.3.3 When the cable is laid in the ceiling and crosses the fire compartment, cables with a burning performance of Class B1 and above shall be used; cables with a burning performance of Class B2 shall be galvanized steel pipes or flexible metal wire conduits under the above conditions. .
6.3.4 Combustion performance B3 power cables can only be laid in non-combustible bodies when wearing rigid plastic pipes.
6.3.5 Lines connected to high-temperature lamps shall be heat-resistant wires or other insulation measures.
6.3.6 For non-fire-fighting loads that require continuous power supply during fire, the power supply and control cables shall be of fire-resistant performance in accordance with Annex II, Class II and above.
6.4 laying of power cables
6.4.1 The distribution of fire protection equipment distribution lines shall comply with the following provisions:
1 Fire equipment supply cable meets NH1, NH2 in Appendix A