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Does the NEC allow for the use of nonmetallic electric conduits in plenum of a confined space in a building?

Question asked by abdulazizabuali on Jan 3, 2020
Latest reply on Jan 4, 2020 by chiefns830

The NEC don't allow for the use of nonmetalic electric conduits in plenum (open space above false ceiling used for return air) in order avoid the convey of smoke and/or fire to other parts of the building.
Is this applicable to a stand alone air conditioning system serving a confined space of the building i.e. ducted split unit serving only one room and there is no any duct or passage above the ceiling to convey smoke/fire to the other parts of the building?
Does the NEC allow for the use of nonmetalic conduits in this case?

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