Jack knowledge about cable:Jack knowledge about cable:knowledge of Fireproof cable

With ten years of development blowout cabling industry , a growing number of internationally renowned manufacturers saw the huge potential of the Chinese market, the first to enter the Chinese manufacturers such as Compton , have Mimi eat a big fat , the more An increasing number of manufacturers want to enter the Chinese market share. Thus , with the end of the era of low and profits , the major manufacturers have come up with their own special skill , desire to dominate the market because of a maturing market has not just rely on international brand awareness and the introduction of foreign technology will be able to gain the initiative right , and to consider how to keep more of the overall pace of development China cabling industry , how can the introduction of foreign technology and marketing and transformation of localization in order to expand its market share in China.

In the network transmission is the most valuable information instead of network equipment. There was such a news , a certain public house on fire, she would only hold a drawer to escape from the scene , the people asked her what ah ! So precious ? She said this is my small to large photos, other things are valuable , and photos are priceless , burned it forever gone. Visible information is non-renewable, it never once lost , so people do everything possible to back up the data through a variety of means to send data through a stable network , placed them in a safe place . People gradually integrated wiring system against external invasion and avoid turning the direction of the external hazards , so the cable fire became their top priority.

It is often said Shuihuowuqing since man discovered fire, and the fire is not only accelerated the development of human civilization , but also to bring the destruction of human civilization , many ancient civilizations destroyed by fire . Similarly, the fire also burned cabling system that allows network transmission interruption. Also, if the cable produce large amounts of toxic gases and soot in the combustion process , the escape would have a significant impact on staff , and even become safety hazards. Therefore, countries engineers are stepping up research personnel for data backup and more secure fire lines .

Fireproof cable type

Wider application of the fire at this stage there are UL Series cables and flame retardant cable LSZH cable into two categories. Import products mainly from the Americas and Europe , due to the fire cable standard in America and Europe are not compatible , fire ideas are very different , and therefore , in the choice of the Party and the Institute products are in a passive state , each with its own the truth, often end up in accordance with the actual situation of funds to choose from.

UL flammability standards mainly in the following grades : CMP, CMR, CM, CMG, CMX.

1 ) booster stage -CMP level ( air combustion test / Tolstoy sodium duct experiments Plenum Flame Test / Steiner TunnelTest)
It is UL fire safety standards in the most demanding cable (Plenum Cable), the applicable safety standards UL910, experimental device specified in the horizontal ducts laying multiple samples , (300,000 BTU / Hr) gas burner combustion 87.9KW 20 minutes . Eligibility criteria for the flame must not extend beyond the gas burner flame front from 5 feet . The maximum peak optical density of 0.5 , the average value of the maximum density of 0.15 .
Such cables are usually installed in the CMP pressurized air return ducts or ventilation system air handling equipment used in Canada and the United States is recognized using . Good flame retardant performance meets UL910 standard FEP / PLENUM materials, flame retardant than meets IEC60332-1 and IEC60332-3 standard halogen material , burning up the concentration of smoke is low.

2 ) Riser -CMR level ( vertical burning test Riser Flame Test)
This is a commercial grade UL standard cable (Riser Cable), the applicable safety standards UL1666. In the simulation experiments predetermined vertical axis Cable samples , the gas burner with a predetermined 154.5KW (527,500 BTU / Hr) 30 min. Eligibility criteria for the flame can not spread to the upper 12 feet high room. Riser cable is not smoke concentration norms , generally vertical and horizontal cabling for floor use .

3 ) commercial grade -CM level ( vertical burning test Vertial Tray Flame Test)
This is a commercial grade UL standard cable (General Purpose Cable), the applicable safety standards UL1581. Experimental regulations laying multiple samples on a vertical stand 8 feet high , with a prescribed burn at 20KW (70,000 BTU / Hr) 20 minutes. Eligibility criteria for the flame can not spread to the upper end of the cable and self-extinguish . Similar UL1581 and IEC60332-3C, just different cabling roots. Commercial-grade cable is not smoke concentration standard, generally used only on the same floor level traces should not be used on vertical wiring floors .

4 ) General Purpose -CMG level ( vertical burning test Vertial Tray Flame Test)

It is common to UL standard grade cables (General Purpose Cable), the applicable safety standards UL1581. Similar to the commercial and general level of test conditions , the same as approved for use in Canada and the United States . General Purpose Cable specification does not smoke concentration , generally apply only to trace the same floor level , should not be used on vertical wiring floors .

5 ) household level - CMX level ( vertical burning test Vertial Wire Flame Test)
This is the UL standard household -level cable (Restricted Cable), the applicable safety standards UL1581, VW-1. Experimental samples provisions remain vertical , with the torch burning test (30,000 TU / Hr) 15 seconds, then stop for 15 seconds , repeated 5 times. Eligibility criteria for the flame must not exceed 60 seconds remaining , the sample can not burn more than 25% , the pad at the bottom of surgical cotton falling objects can not be ignited . UL1581-VW-1 similar to IEC60332-1, just different burning time . This grade does not smoke or toxic specification , only for laying a single cable system in a home or small office . These cables should be installed in bundles must casing. LSZH cables (LSOH).

LSZH cable by definition is less smoke after a fire , halogen-free cable. LSZH cable in principle is to let the flame does not produce a lot of gas and smoke when burned , so that people will not burn a lot of harm caused , greatly improving the survival rate of people in the fire.

LSZH cable test requirements, meet three requirements:
Flammability Requirements: You must have flame retardant LSZH cable . There are two flame retardant grades were required to comply with IEC 60332.1 ( a single cable vertical burning test ) and IEC 60332.3C ( vertical flame spread of bunched cable test ) . IEC 60332.1 which requires the use of a common flame retardant cable requirements, and IEC60332.3C requires relatively high level of flame retardant belong trunk .
Smoke density requirements : LSZH cable to carry the smoke density test . It is used in a confined space fire burning cables until the flame is extinguished after the final indoor smoke density test , required in the case of cigarettes , the ability to reach 60% light transmission , thus ensuring that people can see the smoke road .

Toxicity requirements: current toxicity testing methods several species, such as mice test and so on. In LSZH cable is used in halogen acid gas emission test ( test for low halogen ) and gas acidity test ( for halogen-free test ) . The test principle is halogen gas material at high temperatures ( respectively 800 ℃ and 935 ℃) generated by the analysis method to determine the halogen content .

Describes some of the information IEC 60332.1 level equivalent to the requirements of UL CM (IEC 60332.2 is a small diameter cable testing methods , alternative testing methods that can not be used when testing using 60332.1 ), IEC60332.3C equivalent to the requirements of UL CMR level . In fact, this four standard test methods are not the same , can not be directly compared.

In summary , the formation of two series of cables , one is flame-retardant cable CMX America ( U.S. standard cables clearly requires CMX halogen to increase the decomposition temperature of the cable ) ; the other is European FR / LSOH flame / LSZH cables.