Twin core unscreened cable with precise dimensions - is mfd. by accurately controlled extrusion process giving min. capacity to earth and uniform inter-core capacity

摘要

An electric cable with twin cores (1,10) and prim insulation (2) enclosed in a common outer sheath (3) is mfd. to precise dimensions w.r.t. individual core/insulation eccentricity and core to core separation. A suitable cable forming process employs a first entruder (4) for encapsulating the twin cores (1,10) with primary insulation (2), eccentricity sensors (5,6), process regulator (7), post-coding roller pairs (12,13) and a second extruder (8) with associated sensor for applying the thin outer sheath (3) followed by an ultraviolet curing unit (11). The outer sheath material (3) is of the high tensile, abrasion resistant and fast curing type. USE/ADVANTAGE - Provides guaranteed uniformity of construction with eccentricity of core to primary insulation better than 0.05 mm and capacity to earth when submerged in water supw than 1 picofared per meter. Effect of external stray fields is negligible even thoughm unscreened. Partic. suitable for remote control systems subject to flooding.