【 Weak current College 】 architectural lighting system for fireproofing protection---Power By 【 China power house network 】

1 the current fire code for architectural lighting system of fire and heat insulation
　　
The current specification for fire and electrical fire safety management requirements, architectural lighting system for fire protection generally have some principles require that the provisions of the original text is available in the standard references that are found in the specifications for content summarized as follows:
　　
(1) in order to prevent the harm, the radiant heat luminaires must be combustible keep a certain fire safety distance and away from combustible materials;
　　
(2) switches, outlets, lighting apparatus (including ballast) should not be directly installed in the combustible structure and combustible materials, if you need to install you must take the heat insulation, thermal protection measures;
　　
(3) and luminaires corresponding wiring should not be direct deposited on the walls, vinyl decoration materials, even if the wiring with mechanical protection of protection should also take appropriate measures to the laying of fire protection. The ceiling and walls are decorative plywood, for example, to prevent roof and walls of plywood from the installation switches, outlets, lighting, hot failover, plywood and external surface and the corresponding joists should be fire-resistant coating, coating or decorative ago should be retardants, and allow it to come to the B1 level combustion performance requirements. Even lighting materials can not be less than B1 level. These requirements are the lessons learned from the experience of the fire, the fire on the guidance lighting system, guarantee the safe operation of the lighting system plays a certain role.
　　
2 site electrical fire detection often find electrical fire hazard issues
　　
2.1 luminaires and combustible material in fire safety distance enough
　　
Detection methods using Visual scene, you can easily find luminaires power exceeding limit values, high temperature surface and fuel of fire safety spacing does not meet the requirements of the problem, there is a socket, switch is installed on the Windows side, can easily be curtain cloth cover and shelter, high-power luminaries from too close to combustibles, some mobile appliances will misplacing it. For example, 1985, a Research Institute, the microwave lab darkroom ceiling surface-mount with a layer of combustible absorbing materials, lighting long baking hot smoldering fire. As another example, in October 1986 in the plastics industry, Business Department, owing to fluorescent ballasts to overheat, ignite the fuel immediately, then yanran to plywood wood joist ceiling. Xinjiang Karamay friendship hall high temperature luminaires Cook-off screen surface, killed 300 people also belong to this type of problem. These problems resolved except through engineering measures, most of them can enhance electrical fire and electrical fire safety education, improving workers ' daily electrical fire awareness to be addressed.
　　
2.2 insulation, thermal measures not specification
　　
Test scene issue the most works are completed, and that which is the more difficult questions.
　　
Thermal insulation, fire protection measures for the implementation of the project are not in place. Socket on the combustible or flammable decoration materials, Ming installed outlet box bottom and concealed socket box around, some with glass cloth, asbestos insulation pad advance payment, welt.
　　
On the ceiling fluorescent Grill lights, spotlights, downlight, embedded within the ceiling luminaires installed, usually the processing method is to put the head line wear high temperature yellow wax tube, some even with glass cloth, together with the lamp cartridge and transformer turnkey together. These lamps in the ceiling on installation is more complex, because in itself is a potential electrical ignition source, normal operation will generate heat, the temperature of the luminaires are still very high, and supporting the use of transformers. Now in the spotlight as an example, Spotlight transformer mounted on the ceiling, only secondary rated voltage 36V, bulb current, temperature, up to 300 ° c, the surface temperature is shade generally in 90 ℃ ~ 160 ℃, even up to 200 ℃ or so, sometimes close to the shell of plywood are baking paste carbonization. In the product structure is the structure of the spotlight, head box and isolation transformers, low voltage, high temperature resistant wire not, lamp Cap line labile and wear pipe is not in place, in order to heat the electrician with asbestos cloth will its turnkey together so that you can heat up to a certain role, but also ignores the lamps of the heat, the danger is that may make internal heat accumulation, caused by man-made local overheating, resulting in a fire hazard. There's also the neon transformers in sealed without checking the manhole for ceiling, the transformer itself is a heating element for long-term stay in the ceiling, even if usually appear thermal fault easily discover, electrical fire detection is also not good.
　　
2.3 decoration materials direct deposited wiring hazards multiple
　　
The plastic cord or cable directly deposited in the decoration material, while the pipe made some protection, but are not in place make wires exposed outside, or because construction is not convenient to replace the steel tube with snakeskin. The reason is the poor electrical technology level, another reason is that the owners do not pay attention to or from economic aspects into account, to the neglect of the electrical fire safety work.
　　
2.4 luminaries of rehousing has damaged the roof of the fire performances
　　
Ceiling lighting installation to fire performance of roof damage that did not arouse the attention of the relevant departments, we everywhere you can see the features of buildings according to indoor use, and owners of indoor lighting and lighting effects, the ceiling is installed on many diverse types of lamps, these lamps for installation in recessed to dig holes to burrow's results also destroyed the roof fire protection, sound insulation measures the integrity and effectiveness. Fire smoke and flame will pass through the gap to the ceiling above the spread through expanding the gable wall cavities and neighbourhood, even if the ceiling fire range using the non-combustibility materials or difficultly, smoke and flame penetration gap and proliferation, the spread is inevitable. For smoke and flame penetrated the ceiling, according to the relevant information about the installation of fire embedded lighting time is 1 hour test, ceiling luminaires have a plexiglass plate in the burning of 28 seconds after it was burnt, 2 minutes flamesThrough the embedded lighting of plexiglass plate and into the roof top, visible holes and gaps significantly reduces the time of the fire-resistant roof. Lighting installation in the ceiling placed on electrical ignition source and left a hole in the ceiling, the spread of fire in the ceiling provide the channel. This must all attention and take measures to prevent