These considerations make m24643 shipboard cable the safest of the militarys different shipboard cable specification. Lszh cables feature a flameresistant jacket that doesnt emit toxic fumes even if burned. Lszh cable low smoke zero halogen cables eland cables. This range of cables has been designed to avoid propagation of fire and emission of toxic fumes in case of fire.
This property also means that these cables are more easily disposed of, because they do. Low smoke halogen free cable with the increased demand for safety in public areas and buildings, contractors are now being advised to install materials that are nonhazardous to members of the public in case of fire. Low smoke zero halogen or low smoke free of halogen lszh or lsoh or ls0h or lsfh or ohls or zhfr is a material classification typically used for cable jacketing in the wire and cable industry. The low smoke, zero halogen and flame retardant features make the cables suitable to be used where fire, smoke emission and toxic fumes create a potential threat to life and equipment.
Below is a general explanation of what these fire performance terminologies entails. Green, safe and healthy in order to meet the latest demands for environmentally friendly cables, and those with increased safety in. Low smoke zero halogen cable insulation and jacket have no fluorine, chlorine, bromine, iodine or astatine, so they do not emit toxic or corrosive fumes and create minimal smoke when fire is present. Cables are manufactured with the use of halogenfree materials. Spiral wrap design provides cable wirehose abrasion protection. Conductor thickness thickness thickness overall conductor insulation cable standard of cross no. Since the 1970s, fireretardant, lowsmoke zerohalogen lszh wire and cable has been commercially available for shipboard applications, offshore marine platforms, rapid transit and similar applications where people are present in confined areas. Power circuits rated 600volts in power plants and heavy industrial locations where flame resistance, stability in heat, physical durability, and excellent reliability is needed. Terminology commonly used in the cable industry are, flame retardant, low smoke, low smoke zero halogen, low smoke fume lsf and fire resistant cables which are commonly known as fire survival cables. These cables are designed for flexible uses and free movements under medium mechanical stress. Alpha wires low smoke, zerohalogen lszh communication and control cable combines lszhrated insulation and jackets with the rugged performance you expect from alpha. If they are labelled as low smoke and fume cables it is due to the manufacturer modifying the compound with various additive in order to reduce not eliminate smoke and hcl emissions. For single core cables, a layer of aluminium wires applied. Low smoke cables low smoke and zerohalogen have different meanings and cannot be used interchangeably.
It provides excellent resistance to mechanical abuse, flame, weathering, most oils, acids, and alkalis. Where, when and why should you use low smoke zero halogen. It also seems that zerohalogen cables known as lszh, or low smoke zerohalogen are designed with sheathing that emits low smoke and low levels of toxic material in the event of a fire. The low smoke halogen free properties make h07zr cables ideal for public building and safety wiring applications. Ducab smokemaster low smoke zero halogen armoured power and wiring cables.
Cmg cmp iec verified iec 60332322 nominal velocity of propagation 65% 67% 65%. Since the 1970s, the wire and cable industry has been using lowsmoke, low halogen materials in a number of applications. For example, some manufacturers offer cables that are low smoke, halogenfree, while others offer comparable products that are low smoke, zerohalogen lszh. The term lowsmoke, zerohalogen describes two distinct properties of a cable compound. Low smoke zero halogen power and control cable m2xh low smoke zero halogen power and control cable application. In multicore cables, assembled cores are covered with inner sheath of halogen free compound. Offshore applications challenge cable construction with relentless heat. In uk there is a long history of developing low fire hazard cables with low smoke, halogenfree performance variously lshf, lsoh, ohls, lsnh etc, but no statutory requirements exist for their use. From brand rex brand power, control and signal low smoke, zerohalogen cables designed in accordance with m24643 to fiber optic cables and blown optical fiber systems qualified to m85045 and m49291, general cable offers the. Low smoke cable compounds increased throughput as desired. Low smoke zerohalogen wire and cable since the 1970s, fireretardant, low smoke zerohalogen lszh wire and cable has been commercially available for shipboard applications, offshore marine platforms, rapid transit and similar applications where people are present in confined areas. Usable in all conditions of a marine environments such as dry, wet or oily locations. Tests on gases evolved during combustion of materials from cables. By the term low smoke we mean cab es which or burring do rot emit black dense smoke, so t makes the surroundings c earer ano easier for people to escape during fire.
Unlike lszh cables, lsf cables are manufactured using pvc compounds. Jacket material pvc low smoke pvc low smoke zero halogen etl type cmr. H07zr 6491b lshf wiring 450750v construction plain copper wire conductors to iec 60228 class 2. Used as fixed installation cables in various electromechanical and electronic equipment of marine vehicles. Offshore applications challenge cable construction with relentless. All nplfp cable are listed as having adequate fire resistant and low smoke producing characteristics and must pass bothul test 1424 and ul stiener tunnel test 910. A genuine low smoke zero halogen cable is manufactured from a range of materials which, in a fire, produce very low levels of smoke, gas and reduce the spread of flame. Halogenfree materials typically produce clearer, whiter smoke while chlorinated polymers tend to produce, in part due to their flame resistance, thicker, dark smoke when. Lszh and nonlszh cable designs, the tradeoffs between a cable s low smoke, halogenfree characteristics versus the fire propagation and electrical characteristics makes the decision to go with lszh cables difficult, especially when the traditionally higher cost of lszh products are factored in. Type nplfp nplfp non powerlimited fire alarm cable is listed by the nec as being suitable for use in ducts, plenums and other space used for environmental air.
Low smoke, zero halogen has many different abbreviations, and some of the more common ones are listed in table 1 along with other abbreviations seen in association with lszh cable. Gexol cables prove their value daily in the punishing operating environments of offshore drilling and petroleum facilities around the world. A major contribution towards overcoming these hazards is the use of fire resistant and nonhalogenated cables. Well defined and documented system comprising of system manual, operating procedures. The specially formulated lszh material minimizes the effects from smoke and harmful corrosive gases in. Fire resistant cable in all fire disasters, fire smoke, heat and toxic fumes are the main obstacles to safe evacuation of a building or area.
Lszh communication and control cable alpha essentials. Axon low smoke and fire cables have been designed to meet the following requirements. These cables, commonly called ls0h or 0hls have distinctive thermoplastic or thermoset compounds rather than the traditional pvc for. The use of lowsmoke, halogenfree lshf cables in commercial and residential building projects can help reduce equipment damage and reduce smoke. Low smoke halogen free lshf cables are the safe choice for locations in which there is fire potential and the potential for people to be near that fire. The term lowsmoke describes the amount of smoke which a compound emits when burned, while zerohalogen describes the amount of halogens used to make the compound. Ducab smokemaster cables comply with these halogen free emission standards when exposed to. Low or no emission of fumes to allow the rescue team to work without visibility problems. Low smoke zero halogen lszh ducab cable manufacturing.
The benefit of using mdh versus ath has prompted continued industrial research. Types of low smoke and fume, zero halogen wires and cables. A cable can be low smoke without being halogen free or vice versa. Use of mdh for fireretardant wire and cable has been much limited compared to ath, largely due to the higher cost of typical premium grades of mdh, which is a result of limited supply. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. However, where low smoke zero halogen cables are subject to strict standards, there are no. Halogenfree nylon material low smoke, low toxicity and excellent flammability rating ul 94v0.
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