The NEC (National Electrical Code) issued by the NFPA (National Fire Protection Association) is considered by almost all 50 states to regulate electrical installations in new buildings and innovative projects. NFPA has released the latest issue of NEC 2005, which is enforceable in all states and municipalities that use NEC. Several provisions of the new specification affect lighting, including lighting control panels, metal halide lamps, and the removal of fluorescent lamps before service. 2005 NEC came into effect on January 1, 2005, but different states (or different municipalities) will take different time. Based on the 2002 NEC adoption ratio, several states may adopt the new specification immediately, and about half of the states will gradually adopt it in 2005. NEMA (International Electrical Manufacturers Association) said that in the new edition, several states including Texas, Southern California and New Hampshire have begun to adopt the 2005 NEC, but the implementation time of the relevant regulations is different. Insulated luminaires of metal halide lamps (MH) lamps may have a "non-passive failure" at the end of their service life, causing the thermal quartz components to fall out of the luminaire. 2005 NEC in the 410.73 (F) (5) "metal halide lamp sealing device" for non-passive failure as follows: "Use a metal halide lamp instead of a thick glass PAR (parabolic reflector) light source (lamp), It must be equipped with a seal around the luminaire or a combination of materials that only allow the use of O-type luminaires." This means either a sealed luminaire (any sealed luminaire, including E and S), or an open optical luminaire Will be included in the scope of using only O-type lamps. Open luminaires featuring sockets can only use O-type luminaires. O-type luminaires are insured luminaires, typically 175-1500W, with additional sealing around the curved tube. It features a special base (EX39) so it can only be operated on compatible special sockets. The exception is MH luminaires that use thick glass PAR lamps. To a certain extent, the lighting industry has applied this rule to indoor open MH luminaires that operate below 350 watts. NEC now promotes it to all MH fixtures. In the future, UL may also refer to this requirement, and if UL is used as a standard requirement for luminaire manufacturers, then this regulation will truly become national, because there are still many states that do not immediately adopt 2005 NEC. . This requirement is not expected to make a big difference to the specific operation. The authors need to ensure that the sealed luminaires are properly sized and that the open luminaires have a combination of materials that only operate O-type insured luminaires. In addition, they also need to ensure that the O-type insured luminaires have been specified. Overall, this requirement is expected to simplify existing MH system options. Mixed use of sports and metal halide lamps and mercury vapor lamps in multi-purpose venues where the external bulbs of the luminaire may be broken during normal use in the venue. When the bulb is broken, the glass will slip off the fixture and fall into the place of use. In addition, the curved tube may continue to operate, which may cause the user to overexpose the UV radiation, which may cause sunburn or eye burns. 2005 NEC in Chapter 410.4(E) describes this situation as follows: “Lighting products that use mercury vapor lamps or metal halide lamps and may cause physical damage, are installed in indoor sports, mixed use or multi-purpose sports and In the auditorium area, use a glass or plastic lens to protect the lighting. These lighting products must be allowed to use additional protective accessories.†NEC requires the use of glass or plastic lenses to completely seal these lamps to prevent injury. Luminaires also need to be able to be fitted with an external barrier or cage, but this does not replace the necessary seals. Detachment when the ballast is reinstalled Industry data shows that one of the primary causes of electrician's casualties is electric shock when operating on a 277 volt lighting system. Some believe that some of them are due to the fact that the circuit that prevents the luminaires from being removed from the service area is still under load, the electricians are often forced to export the ballasts, which leads them to ignore the correct warnings, instructions and training content.
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