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  2. Plenum cable - Wikipedia

    en.wikipedia.org/wiki/Plenum_cable

    All materials intended for use on wire and cables to be placed in plenum spaces are designed to meet rigorous fire safety test standards in accordance with NFPA 262 and outlined in NFPA 90A. Plenum cable is required because, if nonplenum cable catches fire, it can release toxic fumes.

  3. Plenum space - Wikipedia

    en.wikipedia.org/wiki/Plenum_space

    A plenum space is a part of a building that can ... Diligence is required to make sure that a non-plenum airspace stays that way. ... and to always use plenum cable ...

  4. Raised floor - Wikipedia

    en.wikipedia.org/wiki/Raised_floor

    Since this type of access floor is not attached to the structure it is considered to be furnishings, fixtures, and equipment (FF&E) that can be a depreciated expense or leased. Since the underfloor cabling is not in a plenum, the expense of plenum rated cable is not required.

  5. Underfloor air distribution - Wikipedia

    en.wikipedia.org/wiki/Underfloor_air_distribution

    While overhead systems typically use ducts to distribute the air, UFAD systems use the underfloor plenum formed by installation of a raised floor. The plenum generally sits 0.3 and 0.46 metres (12 and 18 in) above the structural concrete slab, although lower heights are possible.

  6. Dropped ceiling - Wikipedia

    en.wikipedia.org/wiki/Dropped_ceiling

    While twisted pair cable for networking and telephone service is the most common form of plenum cable, coaxial cable also needs to be plenum-rated for safety. High-voltage electrical equipment (generally regarded as being over 50 V) is not permitted to be exposed in the plenum space above a drop ceiling but must be enclosed in conduit or ...

  7. Coaxial cable - Wikipedia

    en.wikipedia.org/wiki/Coaxial_cable

    Coaxial cable, or coax (pronounced / ˈ k oʊ. æ k s /), is a type of electrical cable consisting of an inner conductor surrounded by a concentric conducting shield, with the two separated by a dielectric (insulating material); many coaxial cables also have a protective outer sheath or jacket.

  8. Plenum - Wikipedia

    en.wikipedia.org/wiki/Plenum

    Plenum (meeting), a meeting of a deliberative assembly in which all members are present; contrast with quorum; Plenum space, enclosed spaces (in buildings) used for airflow; Plenum cable, electrical wire permitted in plenum spaces per building codes; Plenum Publishing Corporation, a publisher of scientific books and journals

  9. 1975 New York Telephone exchange fire - Wikipedia

    en.wikipedia.org/wiki/1975_New_York_Telephone...

    The resulting fire safety regulations include various codes that relate to plenum cable: Standard for the Installation of Air-Conditioning and Ventilating Systems [13] The original restrictions on cable ratings date from 1937 were relaxed in 1975, [14] and then increased again by the National Electric Code.

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