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Technology development trend of fireproof cable

Information Source:Henan Huadong Cable Co., Ltd  Release date:2014-02-08

As information systems become more and more popular, began to enter the various work environment and every household, integrated wiring system already from the new invention twenty years ago into people's daily life can be seen everywhere in the information system transmission cable. When people are able to complete the comprehensive wiring system of high stability, high reliability, has become the new target of attention

whether the wiring system can resist external invasion and avoid external hazards.

In modern society, people are increasingly dependent on fire, also more and more by the fire hazard, so building materials, including fire safety integrated wiring system becomes the focus of the content.

The fire will destroy the integrated wiring system, caused by the interruption of transmission; at the same time, the comprehensive wiring system in the flame, more or less harmful gas, flue gas, may also contribute to the fire gradually spread to other floors or other rooms.

According to the statistics of the fire department, in the fire, about 85% of the deaths were due to smoke suffocation harmful gas fires. The poison, be filled or by the invisible path and cannot escape. While the number of building, integrated wiring cable, across wide over various cable in buildings, the fire of generic cabling system has become the people focus on the system performance is one of the factors to consider.

In Chinese, flame retardant type cable is mainly used with:

⊙ CM cable

CM cable is the most common twisted pair flame retardant grades, test it for UL 1581. In China, twisted pair routine can almost meet class CM flame test.

So the fire resistance characteristics of CM twisted pair:

◆ no spontaneous combustion;

◆ will smoke in the flame, and a possible flame;

The flame spread along the cable is very slow;

◆ when the external source is cut off, the cable flame will gradually extinguished.

CM cable as long as the flame retardant grade requirements, it does not take into account the smoke density and toxicity (UL smoke density and toxicity did not mention 1581).

CM cable is mostly horizontal twisted pair, used in distribution system.

CM cable sheath layer for PVC materials, insulation layer for high density PE material. It is cheap in price, but the disadvantage is the low burning point, normal working temperature is 70 ℃, when the temperature reaches 160 DEG C or higher, PVC material will emit halogen and smoke poisonous. If unfortunately burned it, will release a lot of heat.

According to the integrated wiring construction norms, twisted pair should wear metal pipe, metal bridge after laying in the floor, ceiling and wall. Then, using ordinary twisted pair can be installed on any occasion and does not need to consider the smoke toxicity.

⊙ CMR cable

CMR cable is one of the definitions of flame retardant cable American UL standard, is mainly used in vertical trunk interior parts.

When the cable is placed vertically, cable direction and fire direction, and are often more cable root number, may be caused by the relatively large, at this time should be used high flame retardant grade than ordinary twisted pair cable. In USA UL standard definition, CMR cable can be used for vertical lines.

Testing standard CMR cable for UL 1666, mainly used in vertical lines subsystem of cable.

In UL 1666, 1.3, clearly put forward "the standard is not the burning or decomposition products of poison", at the same time in this standard, no mention of smoke density problem. Therefore, can be considered to have CMR test certificate cable isn't smoke density and toxicity data test data. If you want to know the values of two parameters, the need to find another standard.

The outer sheath layer of CMR material for high flame retardant PVC material, insulating layer of high density PE material. CMR high flame retardant materials by improving the twisted ignition temperature (300 ℃) and flame retardant properties to achieve the purpose of not easy combustion. In the case of fire burning, it will send out a halogenated gases and toxic halogenated gases lead steam, rapid absorption of oxygen, so that the fire is extinguished, the cable self extinguishing. Therefore, in the flame, CMR material once decomposition can produce gas and smoke is harmful to the human body, and its gas water binding, formation of acidic liquid corrosive to equipment.

Similarly, CMR double strand should also wear metal pipe, metal bridge after laying in shaft.

⊙ CMP cable

Testing standard CMP cable is mainly USA UL 910, mainly used for horizontal subsystem without using metal pipe and directly laid on ventilation or forced ventilation environment of cable.

In UL 910, explicitly put forward the flame retardant and smoke density test requirements, but in the 1.3 article, still have "the standard is not the burning or decomposition products toxicity". Conclusion: high flame retardant cable in addition to flame retardant requirements, has been asked to consider the smoke density, but will still be separated in toxicity.

CMP cable sheath layer using fluorine material (such as: PTFE: Teflon or FEP: fluorinated ethylene propylene), its high decomposition temperature (greater than 400 degrees), ignition temperature is high (above 800 degrees), not easy to burn in the fire is small, so it has the fireproof performance better than other organic materials the. However, if the CMP burning materials, releases fluorine gas colorless, tasteless, more toxic, water (including water vapor) into hydrofluoric acid is corrosive.

CMP material cost is very high, the price is much higher than that of ordinary CM cable, CMP cable, the popularity of the same is stopped in two big obstacles in front of people (cost and toxicity) of.
According to the accepted version, CM

⊙ CMR cable

CMR cable is one of the definitions of flame retardant cable American UL standard, is mainly used in vertical trunk interior parts.

When the cable is placed vertically, cable direction and fire direction, and are often more cable root number, may be caused by the relatively large, at this time should be used high flame retardant grade than ordinary twisted pair cable. In USA UL standard definition, CMR cable can be used for vertical lines.

Testing standard CMR cable for UL 1666, mainly used in vertical lines subsystem of cable.

In UL 1666, 1.3, clearly put forward "the standard is not the burning or decomposition products of poison", at the same time in this standard, no mention of smoke density problem. Therefore, can be considered to have CMR test certificate cable isn't smoke density and toxicity data test data. If you want to know the values of two parameters, the need to find another standard.

The outer sheath layer of CMR material for high flame retardant PVC material, insulating layer of high density PE material. CMR high flame retardant materials by improving the twisted ignition temperature (300 ℃) and flame retardant properties to achieve the purpose of not easy combustion. In the case of fire burning, it will send out a halogenated gases and toxic halogenated gases lead steam, rapid absorption of oxygen, so that the fire is extinguished, the cable self extinguishing. Therefore, in the flame, CMR material once decomposition can produce gas and smoke is harmful to the human body, and its gas water binding, formation of acidic liquid corrosive to equipment.

Similarly, CMR double strand should also wear metal pipe, metal bridge after laying in shaft.

⊙ CMP cable

Testing standard CMP cable is mainly USA UL 910, mainly used for horizontal subsystem without using metal pipe and directly laid on ventilation or forced ventilation environment of cable.

In UL 910, explicitly put forward the flame retardant and smoke density test requirements, but in the 1.3 article, still have "the standard is not the burning or decomposition products toxicity". Conclusion: high flame retardant cable in addition to flame retardant requirements, has been asked to consider the smoke density, but will still be separated in toxicity.

CMP cable sheath layer using fluorine material (such as: PTFE: Teflon or FEP: fluorinated ethylene propylene), its high decomposition temperature (greater than 400 degrees), ignition temperature is high (above 800 degrees), not easy to burn in the fire is small, so it has the fireproof performance better than other organic materials the. However, if the CMP burning materials, releases fluorine gas colorless, tasteless, more toxic, water (including water vapor) into hydrofluoric acid is corrosive.

CMP material cost is very high, the price is much higher than that of ordinary CM cable, CMP cable, the popularity of the same is stopped in two big obstacles in front of people (cost and toxicity) of.
According to the accepted view, CM cable in wear metal pipe after the flame retardant effect and CMP cable was equal to or higher than CMP level cable, but this is to increase metal tube and multi occupancy building space for the price, of course, metal pipeline also has the function of protecting the other.

The National Electrical Code (NEC) of the America has clearly defined: communication network must be used with non shielded twisted pair halogen containing materials. This is because, halogen cable has important environmental limitation, but the halogen itself has a strong anti flammability and high burning point, if the cable does not fire or very difficult to fire, so it will not cause combustion, which does not emit toxic fumes.

American comprehensive wiring system in the invention, fire protection, America has in the past been requirements will be as strong as weak cable cable laying fire in the metal pipeline. With the development of material technology, American began allowing the weak system in the fireproof cable using high grade, fire protection without the use of metal pipeline, but the premise is: fire resistance cable required to achieve the common cable wear metal pipe after the same fire rating. Therefore, gradually formed a series of high flame retardant cable.

High decomposition temperature of fire retardant cable is much higher than that of PVC, PE material ordinary cable. For example, the decomposition temperature of CMP cable sheath using fluorine material up to 400 degrees, and the decomposition temperature of ordinary PVC material only 160 degrees. So, in the fire just rises, because the cable by the temperature did not reach the decomposition temperature (the twisted pair no spontaneous combustion, high flame retardant cable) it does not emit toxic gases and vapors, also won't give out heat, so that people can have more time to escape.

Since UL910 Steiner tunnel test (NFPA-262) showed that, by using fluoride materials as the cable sheath layer has the characteristics of low combustion and low smoke the same and iron metal tube, a CMP cable laid the foundation.

Development trend of fireproof cable

Integrated wiring manufacturers now already entered the global sales of the road, each big cabling manufacturer also has high flame retardant cable and low smoke halogen-free cable two series, and some manufacturers also can meet the low smoke halogen-free requirements, and meet the requirements of high flame retardant cable.

With the development of science and technology, America and European technology is also in constant integration. For example: Europe introduced more stringent than those of the CMP EN 50289-4-11 standard, and is a CPD series high flame retardant standards suitable for various cable, if the high flame retardant with low smoke halogen free, so you can imagine: future building cable will not easy decomposition, decomposition and even won't release gases and smoke a lot. It should be said that this.

Development trend of fireproof cable

Integrated wiring manufacturers now already entered the global sales of the road, each big cabling manufacturer also has high flame retardant cable and low smoke halogen-free cable two series, and some manufacturers also can meet the low smoke halogen-free requirements, and meet the requirements of high flame retardant cable.

With the development of science and technology, America and European technology is also in constant integration. For example: Europe introduced more stringent than those of the CMP EN 50289-4-11 standard, and is a CPD series high flame retardant standards suitable for various cable, if the high flame retardant with low smoke halogen free, so you can imagine: future building cable will not easy decomposition, decomposition and even won't release gases and smoke a lot. It should be said that this is already present in the field of integrated wiring cable dream of target.

In Chinese, green environmental protection has become the people have to consider the issue, equipment manufacturing and low smoke halogen-free cable is cheap, don't require a dedicated gas processing equipment, the development of the low smoke halogen-free technology high flame retardant (such as: CMP, LCC) technology development more quickly.

HUADONG Henan Huadong cable group is specialized in the research,development,and production of ABC Cable,Rubber Cable, mv medium voltage power cable,Control/Instrumentation Cable,Mining Cable, Bare Conductor(AAC/AAAC/ACSR/ACS), Huadong Cable Supply the price of 16mm armoured cable,Mc Interlocked Cable, 4 core 240 mm cable price at competitive.
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