| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a workload and a cost for construction.SOLUTION: Overhead transmission lines 20 and 120 are supported by crossarms 14 which are arranged at upper and lower sides of each line. The number of the crossarms are twice or more the number of the overhead transmission lines. An insulation jumper wire 130 connects an overhead transmission line supported by a crossarm corresponding to a line at a lower or upper side thereof and an overhead transmission line supported by a crossarm corresponding to a line at an upper or lower side thereof.</p> |
