A cable used in plenum spaces with tight controls and specifications with regard to fire retardance, low smoke evolution in fire etc. Generally controlled by UL910 and other specifications such as the NEC (National Electrical Code).
Cable approved by Underwriters Laboratories for installation in plenums without the need for conduit.
Cable certified to be fire resistant and to produce a minimum of smoke. It can be installed in the space between the false ceiling and the floor or ceiling above, called the plenum.
Plenum rated cable has been specifically engineered to be placed in the plenum air space above a suspended ceiling. In the event of a fire, the components of the jacket and conductor insulation will not give off toxic fumes and are slower to burn. A plenum rated cable will have on it one or both of the following markings: FT-6 or CMP. Both of these markings are recognized in the United States and Canada.
A cable that is UL listed as having adequate fire resistance and low smoke producing characteristics for installation without conduit in ducts, plenums, and other spaces used for environmental air.
This type of cabling is meant to be used with a plenum ventilation system. It is used in situations where the smoke from fire would saturate the building...
A cable that is rated as having adequate fire resistance and satisfactorily low smoke-producing characteristics for use in plenums (air handling spaces). Air handling spaces are often located below machine room floors or above suspended ceilings, requiring the use of plenum-rated cable.
Cable that that can be (legally) installed in the plenum (the space between a ceiling and the floor above it). Such cable is (usually) teflon-coated so that it will not give off toxic fumes when burned. In some parts of the world such cable is required by law. Source: Foldoc: Free On-line Dictionary of Computing
cable whose flammability and smoke characteristics allow it to be routed in a plenum area without being enclosed in a conduit.
Plenum cable is cable that is laid in the plenum spaces of buildings. The plenum (pronounced PLEH-nuhm) is the space that is used for air circulation in heating and air conditioning systems, typically between the structural ceiling and the dropped ceiling or under a raised floor. The plenum space is typically used to house the communication cables for the buildings computer and telephone network.