Question

You have been given the project of running cables in the space between the structural ceiling and the suspended ceiling in your office building. which cable types would you use for this project?

Answer 1

B) Plenum cables must be used for this project.

A plenum cable must be installed in each "air carrying" space. For example, most large office buildings use the ceiling to return air to the air conditioning system. This qualifies this ceiling as a plenum ceiling and all cables passing through this ceiling must be plenum rated.

Plenum cable /ˈplɛnəm/ is an electrical cable that is installed in the plenum space of a building. In the United States, plastics used in the construction of plenum wiring are regulated by the National Fire Protection Association's standard NFPA 90A: Standard for Installation of Air Conditioning and Ventilation Systems.

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