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Plenum cable / ˈ p l ɛ n əm / is electrical cable that is laid in the plenum spaces of buildings. In the United States, plastics used in the construction of plenum cable are regulated under the National Fire Protection Association standard NFPA 90A: Standard for the Installation of Air Conditioning and Ventilating Systems.
A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning ... and to always use plenum cable in these spaces. ...
Plenum cable, electrical wire permitted in plenum spaces per building codes; Plenum Publishing Corporation, a publisher of scientific books and journals; Plenum (physics), a space completely filled with matter; Undergravel filters, in aquarium filtration, an open space under a layer of gravel or sand; Air-mixing plenum, a place where ducts meet
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 ...
Biden and Trump shared a moment caught on camera while waiting for French First Lady Brigitte Macron to take the seat that separated them during the reopening ceremony.
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