Regulations allow the designers to move the suspensionmounting points within a sphere of 20mm, that is in and out, up or down.
条例允许设计者动议暂停安装点范围内20毫米，这是中和了，上涨或下跌。
2
It USES line length equal method to calculate the sag and the mounting position of the suspension clamp in continuous inclined spans of overhead power line.