Why Is Plenum Rated Cable

Plenum rated (CMP) cable has an outer jacket made of fire-resistant material like Teflon to prevent fire from spreading. When a fire happens, plenum rated cable is designed to: Restrict flame propagation to no more than five feet. Limit the amount of harmful smoke released.

Why do I need plenum rated cable?

Plenum rated cable has a special insulation that has smoke and low flame characteristics. It is mandated to be installed in any “air handling” space. … At that point, the use of plenum cables ensures safety. However, use of plenum spaces may pose a serious hazard in case of fire.

What is meant when a cable is described as plenum rated or non-plenum rated?

Plenum-rated cable has been manufactured to withstand higher temperatures in the event of a fire and does not cause the same level of smoke or toxicity when burning. Non-plenum does not have these characteristics, and as a result costs much less (usually half as much).