For communication circuits, which cables may be installed in plenums or listed plenum raceways?

For communication circuits, which cables may be installed in plenums or listed plenum raceways?

• A. Riser-rated
• B. General-purpose
• C. Non-plenum-rated
• D. Plenum-rated

Answer: (D)

Cables placed in plenums must meet strict flame and smoke performance because air circulated through these spaces can spread fire and smoke rapidly. Plenum-rated cables (CMP) are designed and tested to resist flame propagation and to emit minimal smoke and toxic gases, making them the safe and code-compliant choice for air-handling spaces. That’s why this option is the best fit for installation in plenums or listed plenum raceways. Riser-rated, general-purpose, and non-plenum-rated cables do not meet the enhanced requirements for plenum environments and are not permitted in these spaces.

Cables placed in plenums must meet strict flame and smoke performance because air circulated through these spaces can spread fire and smoke rapidly. Plenum-rated cables (CMP) are designed and tested to resist flame propagation and to emit minimal smoke and toxic gases, making them the safe and code-compliant choice for air-handling spaces. That’s why this option is the best fit for installation in plenums or listed plenum raceways. Riser-rated, general-purpose, and non-plenum-rated cables do not meet the enhanced requirements for plenum environments and are not permitted in these spaces.