套管、导管、槽管及管子附件。
金属导管严禁对口熔焊连接，镀锌或壁厚小于等于2毫米钢导管不得套管连接；
Butt fusion connection is banned for metallic conduit, and bush connection is banned for galvanized steel conduit, or steel conduit with wall thickness of 2 mm and below;
金属导管严禁对口熔焊连接，镀锌或壁厚小于等于2毫米钢导管不得套管连接；
Butt fusion connection is banned for metallic conduit, and bush connection is banned for galvanized steel conduit, or steel conduit with wall thickness of 2 mm and below;
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