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G if one of the wires is intended for earth, X if not. A cable contains several conductors held together by one or more protective sheaths. Halogens like Chlorine are particularly good additives that help retard flame propagation and don’t significantly impact the dielectric properties of the polymer, so Halogens are used in both cable insulations and in cable sheaths. Often, designers realize the dangers of fire spread, halogens & toxic gasses, plus the smoke releasing from cables in the fire so they specify cables to have