JZD Wire&Cable provides a comprehensive scope of Low Smoke Zero Halogen (LSZH) wires and cables for utilization in lots of applying scenes where smoke emission and poison smokes may cause a harm to human body health and essential equipment and devices in the event of a fire.In the lots of LSZH wires and cables, we wanna introduce our solar cable PV1-F which has been hot sale in many countries to you.
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LSZH cables are also commonly referred to as ZHLS cables or halogen free cables because of the LSZH describes the insulation or sheath materials.Maybe someone doesn&#;t know the LSZH wire and cable is alike to the flame retardant wire and cable on the resist the fire to expand in the fire event, making them flame retardant low smoke (FR-LS) cables, so sometimes many buyers will ask for the FR-LS wire and cable in our site.
Now the PVC cable still is more liked by our consumers and purchasers and applied in more application scenes. Unlike PVC cable, XLPE wires and cable and other cables made of other compounds which cause plenty of highly density extremely black smoke, poison fumes and acid air when exposed to fire in a severe fire event, LSZH wires and cables cause very low levels of smoke and poison smoke and almost no any acid gases. Accurately described is the LSZH wires and cables are essentially halogen free cables. Therefore considering the ability to resist the poison smoke to harm human, usually the LSZH wire and cables are used in some specified locations indoors, in particular in some public areas, and in other hazardous conditions and areas where is difficult to be ventilated . Specific those includes solar energy system, automobiles, planes, trains and boats and so on. LSZH insulated and sheathed cables are commonly used in the photovoltaic generating systems and many city tunnels and whole subways network system.Below needed to apart the LSZH concept to 2 independent parts for you understand the LSZH cable better.
Low smoke factor
Referred to the latest building regulations published by many countries and regions , i found some common knowledge on this topic. For example the Building Regulations, a leading planning and building regulations resource for England and Wales and General Building Regulations Rules, a latest government document published in year which conforms the general require on domestic and commercial building for China :
Here taking a quote from this government documents "The initial threat related to a severe fire disaster in its early period actually is not flame usually we thought in the past but the smoke and poison air caused by the shining flame. What&#;s more those severe fire disaster always lead to vast casualties and in the death cases, most of persons are caused by the fumes, the smokes obscure the route to escape directions and exits. Measures designed to provide safe means of escape must therefore provide appropriate arrangements to limit the rapid spread of smoke and fumes."
Firstly let us take a look on PVC properties on smoke production.According to many scientific experiments, a ordinary burning PVC cable has been found to reduce visibility in the surrounding location by as much as 55% within 10 minutes. 30 minutes later, visibility can be reduced by as 95% , if you were a such a visibility environment, for almost persons, making it not meaningful struggling to escape the area, the only thing you can do is waiting for die or hoping the rescue.
How does the LSZH insulated cable behavior in such test? Compared to PVC cable, the LSZH has more excellent performance on test., IEC specifies such a scientific fume density test, operated in a space without any outlets 4m x 4m x 4m. The professional personnel maybe call the test as the 4 cubic metre standard test. By watching the whole process transparency decline when a white light beam projecting from one direction of the room to the another direction at about 2.5 meter height, by this method, we can easily measure the fume density in the space.Usually if a cable or wire qualified to use as low smoke, the lowest require for this cable or wire is there is a minimum beam transparency of 65%, in some particular countries, the require is more strict, like in USA, they often require the transparency reach at 70%.
Zero Halogen factor
No matter what insulated or sheathed material you use in your cable and wire, when met with a fire or high temperature, the insulation definitely will release some harmful gases, how to prevent the gases directly harmful to our body has been the most important issue we are struggling to solve. As we all know when you burn a PVC cable and other cable the insulation or sheath compounds will produce lots of hazardous chemical substances, including hydrogen chloride (HCl) that we learned about in chemistry lesson in high school, which is extremely highly poison and directly harmful to our body. Besides there is a more terrible situation maybe occur, because the hydrogen chloride is very easy to volatilize when confused with water in the air or everywhere, soon HCl will form hydrochloric acid; a substance which is both poison and corrosive. In the case of a PVC cable is burned , as much as 40% of the emissions can be HCl, if you are in the space without any outlets, it will be very dangerous.
IEC rules that emissions of HCl by LSZH cables must be controlled within 0.6%.
Comparison between LSZH and LSF cables
Regretfully now there is a common misconception. Someone still think that low smoke and fume (LSF) cables and LSZH cables are the same, however it is wrong totally. Any manufacturer or supplier who try to mix both conception maybe could be accused of cheating our buyer or consumer, because at last in the case of a severe fire, probably there will are persons died in such a artificial accident.
Alike PVC cables, LSF cables still insist on using PVC compounds during the whole process. However lots of manufacturer or supplier still announce that they are selling the LSF cables, why? Due to the manufacturer or supplier has changed the compound with different additive for declining smoke and HCl emissions, but the LSF cables never can let the smoke and HCl disappear totally. However, where low smoke zero halogen cables are subject to strict standards, there are no standards governing LSF cables. JZD Wire&Cable did such verification. Once we bought 100 metre LSF cable in a B2B platform, then our technical person found to emission of HCl level approach to 30% while he did the burning test, so the LSF cables is impossible to reach the good performance of LSZH cable, compared with PVC cable, indeed it has a better property.
A fashionable application on solar cable
JZD Wire&Cable provides PV1-F solar cable with LSZH solar cable, hot sale in Australia and Israel. Now more and more families choose to install a solar panel in the roof of their house, solar enegery represents the most green and hot energy all over the world, becoming more and more fashionable. LSZH cable is very suitable to be used in the solar panel generating system, which decrease the possibility of breathing the poison gases in case of burn situation. Once there was a such accident happened in Australia Queensland region, in February, , a solar panel device in a house burned because of too strong sun, the instant temperature reached at 200 degrees, the LSZH cable couldn't undertake such scare temperature, however the solar cable is LSZH cable with a perfect LSZH insulation materials, what we can say is that the LSZH cable saved the whole family, avoiding the tragedy happen.
Choosing LSZH cable
Perhaps because the LSZH cable is more expensive than PVC cable, now many countries still insist on using the PVC cable instead of LSZH cable, however we still can find some exceptional example, such as the Britain.The building process standards and legislation of LSZH cable is not short in Britain. Seen on a official investigation document , with the more and more death cases where PVC cable was the main reason, in year PVC cables were subsequently banned by London Underground, then the whole Britain district joined in this campaign gradually.
As a leading city subway and school facility cable and wire manufacturer and supplier, JZD Wire&Cable has helped lots of city subway and school facilities to use the LSZH cables. About 4 years ago, we introduced our LSZH cable to many other countries and obtained plenty of approval and like, such as Australia, Indonesia, The Philippines, Israel and so on, Welcome to contact us actively and we will assign our technical team to analyse your require deeply and help you find the satisfied LSZH cable.
Extension Information
How to Purcahse The Flame Retardant Cable?
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Low smoke zero halogen (hereafter referred to as LSZH but also called LSOH, LS0H, LSFH or OHLS) is a material classification that is common to cable and wire casings.
When exposed to flames and high levels of heat, LSZH materials produce very little visible smoke (compared to PVC and other similar materials) and no halogens, which can be harmful to humans.
There are several similar classifications such as low smoke and fume (LSF) and low smoke varieties of PVC and cross-linked polyethylene (XLPE). Materials with these classifications have similar properties, but often fail to meet prescribed specifications.
This article deals with:
The halogens are a group of elements that can be found in the second column from the right in the periodic table.
Chemically, they are one electron short of having a full shell. This makes the non-metal elements highly reactive. They constantly try and gain an extra electron by reacting with other things &#; including organic matter.
The halogens, displayed in yellow on the below periodic table, can be harmful or lethal to humans.
The main cause of death in a building fire is smoke inhalation, not the flames themselves. Toxic smoke containing halogens is particularly dangerous.
PVC is often advertised as being fire resistant. This means that a high temperature is required for it to start burning. But the problem with PVC is that as it is heated, it gives off more than half of its weight as fumes.
Cable jacketing made of PVC can be dangerous because, when burned, it releases a toxic hydrogen chloride gas &#; chemically like mustard gas. Not only is this harmful to humans but it is also corrosive, and can damage electrical equipment.
Other products of PVC burning, such as dioxin, can cause more &#;slow burning&#; health problems, with the effects staying with victims a lot longer.
Aside from the health effects, the thick acrid smoke that is released by burning PVC can reduce visibility in emergency situations. This can be devastating if, for example, the smoke obscures a pilot&#;s vision during an emergency landing.
PVC cabling can also help fire spread more easily. If lots of PVC wires are bundled together, for example in a group of network cables, travelling between rooms this can help spread flames easily throughout a building and accelerating the destruction.
Regulations have governed the use of PVC in wire and cabling for some time. In certain places, it is ill-advised to use PVC, but it is still common in certain safer settings.
See the difference in combustibility between an LSZH cable and standard cable in the video below.
The first commercial thermoplastic LSZH material for cables was patented by Raychem in . Initially, the material was slow to catch on. But some specifiers saw its value sooner than others &#; notably those in military and transport sectors.
When HMS Sheffield was hit by an Argentine Exocet missile during the Falklands conflict in , the projectile failed to explode when it hit a control room, but a ferocious fire ripped through the ship, killing 20.
The thick poisonous smoke that emitted from electronics on the ship proved far deadlier than the flames.
A fire at King&#;s Cross Underground station in killed 31 when a stray match started a fire underneath a wooden escalator. Again, the thick smoke made it harder for passengers to evacuate and made life more difficult for the emergency services.
These tragedies helped crystallise the need for non-smoking, less toxic wiring in the minds of specifiers. Especially in enclosed spaces such as on war ships and in rail stations, but also more widely across society.
In the UK, low fire hazard cables are used widely, even though there are few statutory requirements for their use.
One important regulation comes from the Construction Products Regulation, introduced last year. From the 1st of July , all cables that are intended for permanent installation in buildings must be accompanied by a Declaration of Performance (relating to the cable&#;s fire resistance) and have a CE marking.
These factors must be considered by building specifiers, who will factor the cable's properties into any risk assessments they carry out. This forms the basis of most regulations in the UK.
More prescriptive regulations govern the use of LSZH cable jacketing in specific industries. Fire resistant cables are widely used in aircraft, trains, ships, submarines, tunnel systems, nuclear power stations and much more. EU regulations require their use in a wide variety of network cables.
Advancements in thermoplastic LSZH made it available to create other accessories for cable management, including LSZH heat shrink tubing, labelling and fixtures.
This meant that more extensive cable management systems could be made from safer materials. Many LSZH cables are ineffective, because although the cables are made from low-smoking, non-toxic materials, other materials used in a cable management system are harmful. This includes things like heat shrink tubing, labels and cable trunking.
Where these cable management systems travel through a whole building it can enable the much faster travelling of fire.
As with LSZH cables, LSZH heat shrink is low smoking and has no harmful halogens. It is perfect for insulating and protecting sensitive cables, as well as for lightweight harnessing and electrical components in enclosed spaces such as marine, mass transit systems and other sensitive environments.
The most important thing to bear in mind when you are purchasing LSZH products is to know what specifications you are trying to meet. A member of our expert accounts team will gladly offer advice in line with your requirements.
If you have any questions please don&#;t hesitate to get in touch. Call: 723 101.
True low smoke, zero-halogen cables must adhere to stringent smoke density tests (see: BS EN -2) and zero halogen tests (in accordance with BS EN -2-1). Cables that do not pass these tests cannot be classified as LSZH.
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