Riser-cable meaning

A type of inside cable intended for use in non-plenum vertical applications such as between floors of a building. In consideration of the longitudinal stress placed on a riser cable, load-bearing strength members are incorporated to increase the tensile strength, as well as to relieve the conductors of the load. Although riser cables must be fire retardant, the National Electrical Code (NEC) specifications for riser cable are not as demanding as those for plenum cable. See also horizontal cable, NEC, plenum, plenum cable, and strength member.
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