规定了对现有的轻型或普通危险分类自动喷水灭火系统进行轻微修改的要求，例如拆除、更改或添加喷水灭火器，或修改或添加有限尺寸的范围和分配管。

Sets out requirements covering minor modifications to existing sprinkler systems of light or ordinary hazard classification, such as the removal, alteration or addition of sprinklers, or the modification or addition of ranges and distribution pipes of limited size.