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What is cat5e Plenum cable?

By: Laura SUpdated: November 17, 2020

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Plenum rated cable has a special insulation that has low smoke and low flame characteristics. Plenum cable is mandated to be installed in any "air handling" space. For example, most large office buildings use the ceiling to return air to the AC unit.

Also know, what is plenum cable used for?

plenum cable. Cable that is run in the plenum spaces of buildings. In building construction, the plenum (pronounced PLEH-nuhm) is the space that is used for air circulation in heating and air conditioning systems, typically between the structural ceiling and the suspended ceiling or under a raised floor.

One may also ask, what is the difference between plenum and riser cable?

Many customers ask, “What is the difference between plenum rated cable & riser rated cables.” Plenum rated cables are used in plenum areas meant for use in commercial and residential spaces. Riser rated cables run between floors through cable risers or in elevator shafts in non-plenum areas.

Where is plenum rated cable required?

Why Use Plenum 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. For instance, most large office buildings use the ceiling to return air to the AC unit.

Should I use plenum cable in my house?

If there is no sheet metal duct; just the open ceiling or wall space, then you are required by law to use Plenum Rated cable. The lack of wall or ceiling return air grates is usually a sure sign that you require Plenum Rated Cable. Computer Rooms typically use a raised flooring system for the server racks.

Related

What is plenum vs non plenum?

Plenum cables are run in that space (the plenum) to minimize the hazard from burning cables in a fire. Non-plenum, often called riser cables are less expensive and are used in spaces that do not intermingle with normal air circulation: attics, closed walls, conduit, etc.

Do I need plenum cable in my attic?

If there is no sheet metal duct; just the open ceiling or wall space, then you are required by law to use Plenum Rated cable. The lack of wall or ceiling return air grates is usually a sure sign that you require Plenum Rated Cable.

How do I know if a cable is plenum rated?

Plenum cable is covered with a fire proof plastic layer of either a low-smoke polyvinyl chloride (PVC) or a fluorinated ethylene polymer (FEP). It may have a "CMP" designation on it. If it has a "CM" or "CMR" it is not plenum rated.

Should we use plenum or riser rated cables?

Plenum rated cables have a higher fire rating for both commercial and residential use. When cables are needed in the air ducts, plenum cables are the primary choice. Riser cables, namely CMR cables, are widely used for regular networking from floor to floor in non-plenum areas.

What is the difference between cat6 riser and plenum?

Cable which is to be run between floors in non-plenum areas is rated as RISER cable. The fire requirements on riser cable are not as strict. Thus, plenum cable can always replace riser cable, but riser cable cannot replace plenum cable in plenum spaces.

Is an open ceiling considered a plenum?

An open ceiling in a retail store would not be a plenum area. If this was the case all the merchandise would need to be rated to be installed in environmental air ducts.

What is plenum and what must you do to be able to run cable through plenum space?

Plenum spaces are the open spaces above the ceiling or below the floor that are used for air circulation. Technically, any ductwork is considered a plenum space too. Any cable that you run through plenum spaces must be plenum rated, even wiring used for information transfer, like Cat5 wiring.

Is cat6 better than cat5e?

Cat5e cables support only up to 1000BASE-T (Gigabit Ethernet). Cat6 cables are usually a better choice than Cat5e, in that technologically moving forward they are more suited to handle faster connection speeds and are worth their slight difference in price. Cat5 cables in contrast, only provide speeds up to 100 MHz.

Why would you use plenum rated cables when installing new cabling in a data center?

Plenum is a special material used to jacket a cable, this jacket is fire retardant and will reduce the amount of hazardous fumes in the air if the cable is subject to a fire.

What is the difference between CM and CMR cable?

The fire resistance requirements for CMR is much stricter than that of CM, which means that CMR cable can be used as a substitute in any area where CM cable would be required. CMR cable is more flame-retardant and consequently more expensive than CM cable.

What is a riser cable?

A type of inside cable intended for use in non-plenum vertical applications such as between floors of a building. In consideration of the longitudinal stress placed on a riser cable, load-bearing strength members are incorporated to increase the tensile strength, as well as to relieve the conductors of the load.

What is cat6 Plenum cable?

Plenum cables have the strictest flame ratings with higher cost, since they have a special coating on the wire. They are usually used in plenum spaces for preventing flame spreading and reduce the smoke amount. For example, plenum rated Cat6 and riser rated Cat6 perform the same in the data transmission.

What is a plenum ceiling?

In building construction, a plenum (pronounced PLEH-nuhm, from Latin meaning full) is a separate space provided for air circulation for heating, ventilation, and air-conditioning (sometimes referred to as HVAC) and typically provided in the space between the structural ceiling and a drop-down ceiling.

What are plenum spaces in buildings?

In building construction Plenum is a separate space provided for air circulation for heating, ventilation, and air-conditioning. It is commonly found in the space between the structural ceiling and a drop-down ceiling or under a raised floor.

Is plenum cable outdoor rated?

Plenum cable is rated for the “plenum spaces” in buildings, which are simply the parts of the building that facilitate air circulation in heating and air conditioning systems. This designation simply means that the cable has been engineered to be buried without any kind of outside protection.

Is plenum cable required in conduit?

No a plenum cable is only required in a plenum the space above a false ceiling. In a conduit you can use almost anything. In a plenum you need special cable jackets that can't burn nor produce toxic smoke because the plenum space is often used as a supply air duct.