A ballast intended to be supported only by rigid metal conduit , a fixture stud , or similar devices shall comply with the requirements in section 18 , pullout , bending , and twisting tests 整流器只能由刚性金属导管支撑,装配螺栓或相似的部件必须符合18条,通过拉力、弯曲和扭转测试。
rigid metal conduitとは意味:rigid metal conduit 金属電線管 rigid metal conduit meaning:[Architecture] A raceway for electric wires or cables, made of metal pipe of standard thickness and weight permitting the cutting of standard threads.