For the low chain tension (passive) side, this tube shall be significantly longer than the hightensionside tube.
对于低链条张力(无源)方面，这管筒应大大超过了高度紧张的一面。
2
When the electric power lines fall onto the upper side, the hightension electricity can not pass through the insulation protective sleeve for the user lines, and the fatal accident can be avoided.