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Okonite Armored Underground Signal Cables are designed for use in all vital railroad signal circuits where security of service and long life are required in all vital circuit and safety related applications. These cables are recommended for use where crush resistance, termite and rodent protection are considerations and in all wet and dry locations.
AREMA Signal Manual Part 10.3.17
Conductors: Solid uncoated copper per ASTM B-3, stranded uncoated compact round copper per ASTM B-496.