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Cable that is run between floors in non-plenum areas is rated as riser cable. [2] The fire requirements on riser cable are not as strict. Thus, plenum cable can always replace riser cable, but riser cable cannot replace plenum cable in plenum spaces. Both plenum and riser cables commonly include a rope or polymer filament with high tensile ...
Some cables are UV-rated or UV-stable meaning they can be exposed to outdoor UV radiation without significant degradation. [40] Plenum-rated cables are slower to burn and produce less smoke than cables using a mantle of materials like PVC. Plenum-rated cables may be installed in plenum spaces where PVC is not allowed. [41] [self-published source?]
A non-plenum airspace can become a plenum airspace by accident if the ductwork is disconnected and not properly repaired and resealed. Ductwork disconnection can occur due to building damage such as earthquakes, aging, or adverse environment causing the metal to corrode and fall apart, or simply negligence on the part of building contractors ...
As stated in industry requirements document Telcordia GR-3155 [1] Generic Requirements for Microducts for Fiber Optic Cables, microduct products are expected to: Be compatible with existing construction designs and building configurations for both riser- and plenum-rated applications, including cable blowing apparatus.
That is if a plenum-rated cable is used, sprinkler requirement may be eliminated.[32]" The link to note 32 is dead (404)so I am not sure where such an idea came from. The use of Plenum-rated cables does not eliminate fire sprinkler requirements. Plenum-rated cables are required in ceiling spaces which are used as a return air plenum.
The temperature rating of a wire or cable is generally the maximum safe ambient temperature that the wire can carry full-load power without the cable insulation melting, oxidizing, or self-igniting. A full-load wire does heat up slightly due to the metallic resistance of the wire, but this wire heating is factored into the cable's temperature ...
Distinct from ductwork as a plenum is part of the structure itself. Cable and piping within a plenum must be properly rated for its fire and smoke indices. See also: plenum chamber
Each is rated to protect against personal access to hazardous parts, and additional type-dependent designated environmental conditions. A typical NEMA enclosure might be rated to provide protection against environmental hazards such as water , dust , oil or coolant or atmospheres containing corrosive agents such as acetylene or gasoline .