Butt fusion connection is banned for metallic conduit.
金属导管严禁对口熔焊连接。
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;
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；
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