| 摘要 |
<p>PURPOSE:To enable pulling out a cable easily from a conduit by dehydrating and contracting a corrosionproof layer through causing an overcurrent to flow through a cable conductor while sending hot air into said conduit. CONSTITUTION:After a compressed air is sent into a conduit line 3 to drain said line completely, 200A current is supplied to a cable conductor 2 for 8 hours, while e.g. 100 deg.C hot air is sent into said conduit 3 to heat a cable for 8 hours to dehydrate and contract a corrosionproof layer 1. After that, said cable is pulled out from said conduit line 3, so that the work can be performed smoothly.</p> |
