指定波纹柔性金属软管的设计特性，可用于在爆炸性环境或有火灾危险的环境中保护电线和电缆。这些软管可以用作静电保护，也可以用于不经常偶尔或少于一周的电缆保护。还提供使用这些软管的说明和型式认可所需的测试

Specifies the design characteristics of corrugated flexible metallic hose which can be used to protect electrical wire and cable in explosive atmospheres or atmospheres where there is a risk of fire. These hoses can be used as static protection or for the protection of cables moved infrequently, occasionally, or less than once week. Also provides instructions for the use of these hoses and the tests required for type approval.