Mouth of conduit should be smooth and equipped with protection mouth.PVC conduit should be connected by sleeving and should be 1.5 to 3 times longer than external diameter of connecting conduit.

• 电管必须丝扣连接，管口应光滑无毛刺，护口齐全，PVC管应用套管连接，套管长度为连接管外径的1.；5-3倍。