Understanding CMR and CMP Cable Ratings

Ethernet cables are available with different fire safety ratings designed for specific installation environments.

CMR (Riser Rated) cable is intended for vertical runs between floors in commercial and residential buildings. It helps prevent fire from spreading through riser spaces.

CMP (Plenum Rated) cable is designed for air-handling spaces such as drop ceilings and raised floors used for air circulation. CMP cables meet stricter fire safety requirements and produce less smoke.

Choosing the correct rating helps ensure compliance with local building codes and installation standards.

Always verify the required cable rating before beginning any structured cabling project.