Primary Airfield Lighting Cables Screened
versus
Non-Screened
Two different types of
cables are used in primary airfieldlighting circuits:- non-screened
cables and - screened
cables.Classically both
cables have a single AWG 8 copper
conductor or a cross section of 6.0 mm 1. CCR, transformer, lights and
cable The fig. 1 shows a typical primary airfield lighting circuit,where a constant current regulator (CCR) feeds the primaryairfield
cable, the transformers and the lights.
2 . In most cases, theconductor is equipped with a conductor shield formed by a
semi-conductive layer, covered by an XLPE insulation.Typically the non screened
cable has no outer sheath.
The screened version has another semi-conductive layerabove the XLPE insulation covered by a metallic screen
(braid or metallic foil) and an outer sheath.Both
cables perform well in primary airfield lighting circuits.Nevertheless, the non-screened
cable shows a rather high
sensitivity to the tracking phenomenon under specific
circumstances, leading to service interruption of the lighting
circuit. Fig. 1
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