1. Power cable, need to wear protection tube pipe inside diameter should not be less than 1.5 times of cable diameter, concrete pipe, clay pipe, asbestos and cement pipe inside diameter should not be less than 100 mm.
2. The bending radius of the cable pipe shall comply with the terms of wear into the cable bending radius.
3. Each tube should not be more than three elbows, and the elbow bend should not be more than two.
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