Recommended for HVAC
"Plenum" is a fire code rating. It is sometimes identified by the designation "CMP" meaning a communications plenum rated cable. http://www.lockergnome.com/it/2005/04/01/what-is-plenum-cable/
Type cmp, catvp cl3p, fplp P designates "plenum"
Plenum rated cabling is required when used in an open ceiling return air environment. That is when the return air for the hvac units use the space between the ceiling of the first floor and the floor of the second floor as a return air plenum. The way to tell is if the return air vent has a duct attached to it. The duct will run to the air conditioning air handler. This condition IS NOT a plenum rated ceiling. However, if the return air vent does not have a duct, that means the air conditioning air handler is using the air space between floors as a plenum. This condition requires the use of plenum rated cabling. If plenum rated cable is exposed to flame, it does not give off toxic gases as it melts.
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The type of cable commonly used for fire alarm systems is called "fire-rated cable" or "plenum-rated cable." This type of cable is designed to meet the fire safety standards and building codes for fire alarm system installation. It has a fire-resistant jacket that helps prevent the spread of fire and toxic smoke in the event of a fire.
When running a network cable above the drop ceiling, ensure you follow local building codes and regulations regarding low-voltage wiring. It's essential to use appropriate plenum-rated cable if the space is a plenum area to minimize fire hazards. Secure the cable with cable ties or clips to prevent sagging, and avoid running it near any electrical wiring to reduce interference. Finally, label both ends of the cable for easy identification and troubleshooting in the future.
Fibre optic cabling is preferred for backbone cabling, particularly over large distances. But whichever type of cabling you use, cable that passes from floor-to-floor or through plenum areas must be fire-rated. Optical fibre non-conductive riser (OFNR) and/or optical fibre non-conductive plenum (OFNP) are the obvious choices here.
Plenum (OFNP - Optical Fiber Nonconductive Plenum) Source: www.extron.com/company/article.aspx?id=decipheringapp
Here in Louisville, KY General purpose runs for about 75$ a box and Plenum is $250.
Plenum
Plenum refers to a type of building and how its air is exchanged. When a bulding is on fire and the cable starts to burn it gives off toxic fumes and will kill you. Plenum cabling is coated differently for burning purposes.
PVC/Riser grade versus Plenum grade Ethernet cableI found about half a 1000ft roll of Cat 5 Ethernet cable. As far as I understand, it's Space ShuttleCAT5e350MHz24AWG4 Twisted PairsSolid conductors