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Plenum cable is cable that is laid in the plenum spaces of buildings. A plenum space is typically a space between the floors of a building, which can accommodate heating and air conditioning duct work and other installations. Plenum cable gets put in this unused portion of the building, which is not directly accessible to those living or working there.
The standards for plenum cable are different than those for cable laid in occupied spaces of a building. The National Fire Protection Association in the U.S. has developed fire-proofing standards for plenum cable. Plenum cable may also require a different bend radius to accommodate the brittleness or stiffness of some of these sorts of cables.
Different types of plenum cable used in plenum spaces include coaxial and twisted pair cable, along with other types of cable for high-definition video and other data signal types. The standards and requirements for plenum cable are considered on an ongoing basis in order to promote effective health and safety standards while lowering fire risk. Those who work in tech installation, building and related trades should know about the current requirements for this specific category of connecting cable.