根据布线系统对火灾和机械损伤的抵抗力，制定布线系统的分类方案。给出了验证布线系统提供的保护等级的型式试验。用于其他标准中的参考，这些标准规定了具有一定程度的耐火性或机械冲击损伤的布线系统。

Sets out a classification scheme for wiring systems according to their resistance to the hazards of fire and mechanical damage. Type tests to verify the level of protection provided by a wiring system are given. Intended for reference in other Standards which specify wiring systems with a degree of resistance to damage from fire or mechanical impact.