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.
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Why would you use plenum cable?

Plenum spaces allow fire and smoke to travel quickly. By using plenum-rated cable, the levels of toxicity in the smoke would be lower since plenum cable is coated with a jacket that is typically made of flame-resistant material such as Teflon.

What is the difference between plenum and non-plenum cable?

Non-plenum cable usually serves to run through non-air circulating areas. Non-plenum includes riser rated cable, and other rated cables like CM cable, etc. … The fire rating of riser cable is not as strict as the plenum cable since plenum cable uses less hazardous and lower smoke materials.

What is the difference between riser rated and plenum rated?

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.

Which wire type can you run in a plenum?

Plenum cables are coated with flame retardant and made using special plastics that don’t smoke nearly as much as other plastics to help prevent this problem. Any cable that you run through plenum spaces must be plenum rated, even wiring used for information transfer, like Cat5 wiring.

Is plenum cable fire rated?

Plenum-rated cables have a higher flame-resistance requirement than riser-rated cables. Riser-rated cables are installed between floors through cable risers and in elevator shafts. They must self-extinguish and prevent fire from traveling up the riser between the floors or elevator shafts.

Do I need 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.

What makes a ceiling plenum rated?

A plenum ceiling is one that uses the space between the top of the suspended ceiling and the bottom of the floor above to handle air for ventilation. All suspended ceilings are not plenums; some may use HVAC ductwork to move air to returns and diffusers located in the ceiling tiles (a ‘dead’ ceiling).

How do I know if a cable is plenum rated?

Look for CMP(means Communications Plenum Cable) ,CL3P(Shielded Multi-Conductor Plenum Security Cable) , or CL2P(Class 2 plenum cable ) marked on the cable. Plenum cable is covered with a fire proof plastic layer of either a low-smoke polyvinyl chloride (PVC) or a fluorinated ethylene polymer (FEP).

Is Romex plenum rated?

Romex is not rated for this type of use.

Can I use riser cable in my house?

Senior Member. You do NOT need plenum or riser rated for in wall home use, unless for some silly reason you are running the cables inside one of your air conditioning ducts. You most likely DO need some sort of CL2, CL3, CM, etc. rating to meet your local/state/whatever fire codes.

Can plenum cable be used outside?

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 better than riser?

Prices for plenum cable can be 50%-70% higher than riser cable. As plenum cables have to meet a stricter fire safety standard than riser cables, the materials used in plenum cables to meet these standards are usually more expensive than the material used in riser cables.

Is FT4 cable plenum rated?

FT4 and FT6 are Canadian fire code standards related to the fire and smoke retardancy characteristics of communications cable. FT4 is roughly equivalent to USA CMR(riser) rating and FT6 is equivalent to CMP (plenum) rating in the USA.

What is plenum rated material?

Plenum cable is jacketed with a fire-retardant plastic jacket of either a low-smoke polyvinyl chloride (PVC) or a fluorinated ethylene polymer (FEP).

Is CMR cable plenum rated?

CMR cable, often called “riser-rated cable,” is constructed to prevent fires from spreading floor to floor in vertical installations. … Even higher rated is CMP (plenum-rated cable). This cable is designed to restrict flame propagation to no more than five feet, and to limit the amount of smoke emitted during a fire.

Can plenum wire be painted?

Painting the cables can change the cable performance properties in unknown ways. This is especially true of plenum cables, which are designed to have excellent fire-resistance properties. Painting or coating of plenum cables might compromise their fire-safety properties.

Is SWA cable fire rated?

SWA cable (BS 6724) is not fire resistant. Answer: Normal steel wire armoured (SWA) cables, either PVC sheathed (BS 5467), or the type having low emission of smoke and corrosive gases when affected by fire (BS 6724), do not have a fire resisting property.

Is plenum cable UV rated?

It also supports an extended temperature range of –40° to 125° C, higher power handling, and lower coefficient of friction for easier installation. Further benefits include improved cut-through and abrasion resistance, coupled with advanced chemical and overall UV resistance.

Do you need plenum cable in conduit?

Do you need plenum cable if it’s in conduit? If you’re using plenum-rated conduit, you don’t need to use plenum-rated cable. This is true even if the conduit is in a plenum space. The most common types of plenum conduit are innerduct (often used for fiber runs) and metal.

Why is plenum cable more expensive?

When running cables within plenum spaces, plenum cables are a must. Because plenum cables are built to a higher fire resistance standard than riser cables, plenum cabling is more expensive than riser cabling.

Is LSZH cable plenum rated?

As the two illustrations make clear, LSZH is no substitute for plenum rated cable. LSZH may be a safer alternative to outdoor (CMX) cable jackets being used indoors, but right now that is all it has going for it.

What is the difference between plenum and PVC cable?

PVC (Polyvinyl Chloride) is what your standard Category 5e and Category 6 cable jacket is constructed of. … Plenum cable is made of Teflon or FEP which gives off much less poisonous gas than PVC when it burns.

Is electrical tape plenum rated?

Plenum Rated Cable Ties that Comply with National Electric Code. … VELCRO® Brand ONE-WRAP® FR Tape is UL rated and suitable for use in air handling spaces in accordance with Section 300.22 (C) and (D) of the National Electrical Code.

Is CL2 cable plenum rated?

CL2: This is a cable jacket fire resistance rating defined in Article 725 of the National Electric Code. … CL2 cables may be further classified as “CL2R” (Riser Rated) and CL2P (Plenum Rated).

What does VW 1 mean on wire?

VW-1: These cables have passed a VW-1 flame test and carry a “fire resistant” designation. The VW-1 test provides an assessment of the cable insulation material and resilience to fire. This is one of the most severe tests since it’s performed vertically and can be viewed as a worst-case test condition.

Which is better CAT 5 or Cat6?

What are the Advantages of a Cat6 Ethernet Cable? Compared to Cat5/5e cables, Cat6 cables have stricter performance specifications and significant higher data transfer speeds at greater distances. They are more tightly wound than Cat5 cables, and the cable conductors and cable sheath are thicker as well.

Is Cat5e plenum rated?

Product Description This Gray Bulk Cat5e is offered in 1000-foot pull boxes. It is unshielded twisted pair (UTP) that is plenum rated (CMP).

Can you run Romex through a cold air return?

As long as there are no sharp edges in the chase that might physically damage the cable, there’s no code violation if Romex touches metal hvac supply or return ducts. … On the other hand, it’s common practice to run Romex perpendicularly across a panned stud cavity or joist bay used as a cold air return duct.

Can I run Ethernet through cold air return?

Yes, it is within code to run a low voltage wire inside an air return (aka plenum) in the US.

Can I run cable through vents?

You can run ethernet cable through air ducts, but it may be against local building codes. PTFE or Teflon-coated cable is more resistant to heat and is better for use in air ducts. … There are also legal questions that need to be addressed related to building codes, lease agreements, and insurance policies.

Why is it called riser cable?

Riser cable is cable that is ran between the floors in non plenum areas. They get their name because of the way riser cable is ran which is rising up to each floor. Riser cable is important in that it can be a buildings backbone that transmits data, audio and video signals.

What does CMR CMX mean?

CMP cables are plenum cables; these cables are used if networking must be done in air ducts. They can be used for commercial or residential spaces. They will not combust and cannot actually cause fires. CMR cables are riser cables. … CMX is a residential grade cable.

Do riser cables affect performance?

The riser probably does affect performance a bit. 3700 vs 3800 is only like 2%, so in the grand scheme of gaming if you were getting 90FPS in a game before, with the riser you’d get 2% less, so 1.8 less FPS, or 88.2 FPS.

Can you bury CAT 5 cable?

Exterior-grade Ethernet cables are waterproof and can be buried in the ground without a conduit.

What is plenum rating?

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. … This qualifies this ceiling as a plenum ceiling, and all the cables that go through that ceiling must be plenum rated.

Can plenum cable be used 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. This is because a conduit stops most fires and prevents smoke from a burning cable from getting out.

Is thermostat cable plenum rated?

Plenum-rated thermostat wire is electrical cable that has been rated to run through the air-circulation spaces in buildings, usually located between the structural and suspended ceiling or under a raised floor. … Thermostat wire is electrical cable that connects thermostat controls to a main power circuit.

Which is true about a riser rated cable?

Riser rated cables run between floors through cable risers or in elevator shafts in non-plenum areas. These cables must also self extinguish and prevent the flame from traveling up the cable in a vertical burn test. Fire requirements are not as strict on riser cables compared to plenum cables.

Is CAT6 plenum rated?

Cat6 Cable is used in network applications and has been designed specifically for Gigabit Ethernet applications. They perform at high-data transfer rates, and work with ATM and gigabit speed products. This particular cable is a plenum rated blue UTP (Unshielded Twisted Pair) bulk cable.

Is FT1 better than FT4?

FT1 Cables can be used in Combustible buildings. The FT4 Vertical Flame Test — Cables in Cable Trays is similar to the UL-1685 Vertical Tray Flame Test, but is more severe. … FT4 Cables can be used in Non-Combustible buildings.