| 摘要 |
Electric cables with sector-shaped conductors, for maximizing duct capacity, are made by a process in which the shaped metallic conductor is first preformed into a helical twisted form ("pre-spiralled"), next covered with insulation of EPR, polyethylene or other suitable insulation material to form a core, third subjected to ionizing radiation to crosslink the insulation, and fourth laid up with other like cores to form a cable. All the steps are well known yet the potential to apply radiation crosslinking to this type of cable - in which other crosslinking techniques are wholly impracticable - has not hitherto been appreciated.
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