Plenum-Rated Cable (CMP)

Plenum-rated cable (CMP) is mandated by NEC 800 in any space used for environmental air return — typically the area above drop ceilings. EIG PRO uses plenum-rated runs in all commercial ceilings and any multifamily corridor with shared HVAC return. Plenum-Rated Cable (CMP) should be read together with the project specifications, adopted codes, authority requirements, and referenced standards. A glossary summary explains the construction purpose but does not replace the current published document or a project-specific design review. Editions and local adoption can differ, so the design team should identify the controlling requirement before bidding or installation. For construction administration, document the requirement in drawings, specifications, submittals, RFIs, inspection records, and closeout material as appropriate. When two requirements appear to conflict, request written direction rather than selecting the less restrictive interpretation. That record helps the owner, designer, general contractor, and trade partners understand how Plenum-Rated Cable (CMP) was applied on the actual project.