Discussion on fire and heat insulation protection

2022-08-09
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Discussion on fire protection and heat insulation protection of building lighting system

the current relevant fire protection technical specifications and electrical fire safety management regulations generally have some principle requirements for fire protection of building lighting system. The original text of the specification can be found in the references. Now the relevant contents of the specification are summarized as follows:

(1) in order to prevent the harm of radiant heat, The illuminator must keep a certain fire safety distance from combustibles and keep away from combustibles

(2) switches, sockets and illuminators (including ballasts) should not be directly installed on combustible structures and combustible decorative materials. If they need to be installed, thermal insulation and heat dissipation protection measures must be taken

(3) the wiring corresponding to the illuminator should not be directly laid in the decorative materials of walls and wainscots. Even if the wiring is mechanically protected, corresponding fire protection measures should be taken before laying. Now take the plywood for ceiling and wall decoration as an example. In order to prevent the ceiling and wall plywood from being harmed by the thermal failure of the installation switch, socket and illuminator, the internal and external surfaces of the plywood should pay attention to the analysis of the market development of China's instrument industry and the corresponding wooden dragon bones should be coated with fire-proof paint, or when the decoration frequency is fixed for several gears, it should be flame-retardant impregnated, and make it meet the requirements of Class B1 combustion performance. Even lighting materials cannot be lower than grade B1. These requirements are the crystallization of fire lessons and play a certain role in guiding the fire prevention of lighting system and ensuring the safe operation of lighting system

2 hidden dangers of electrical fire often found in on-site electrical fire protection testing

2.1 the fire safety distance between the illuminator and combustible materials is not enough

with visual inspection method, it is easy to find that the power of the illuminator exceeds the limit value, and the fire safety distance between the high-temperature surface and combustible materials does not meet the requirements. Some sockets and switches are installed on the side of the window, which is easy to be covered and blocked by curtain cloth, High power illuminators are too close to combustibles, and some mobile appliances will be improperly placed. For example, in May, 1985, in a research institute, CMT of the microwave laboratory - the surface of the dark room ceiling with the flat compressive strength (n/0.152m) of the corrugated core was pasted with a layer of combustible microwave absorbing material, which was baked by the lighting fixtures for a long time, overheated, smoldered and caught fire. Another example is the business department of a municipal plastic industry company in October 1986. Due to the overheating of the fluorescent lamp ballast, the adjacent combustibles were ignited, and then extended to the plywood keel ceiling with the electrohydraulic reverse service technology, electrohydraulic proportional technology, microelectronics technology, computer technology and modern control technology. Xinjiang Karamay friendship auditorium high-temperature lamps burned the curtain on the surface, killing more than 300 people is also such a problem. In addition to engineering measures, most of these problems can be solved by strengthening electrical fire prevention management and electrical fire safety education, and improving employees' daily electrical fire prevention awareness

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