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1．线管可燃：国标GB－50258－96中第2．4．l有明文规定：“保护电线用的塑料管及其配件必须由阻燃处理的材料制成，塑料管外壁应有间距不大于lin的连续阻燃和制造厂标”。做此规定的目的是防止由于线管阻燃性能不良而引起电气火灾。检验是否阻燃的方法是：看其是否离火自熄。
1. Line tube flammable: 2.4 in national standard GB-50258-96. l It is stipulated that “The plastic pipes and their accessories used for the protection of electric wires must be made of flame-retardant materials, and the external walls of the plastic pipes shall have continuous flame-retardant and factory markings with a spacing of not more than lin.” The purpose of this regulation is to prevent electrical fires due to poor flame retardance of the conduit. The method of checking whether it is flame retardant is to see if it is self-extinguishing from the fire.