LSZH cable is low smoke halogen free cable. low smoke emission, namely, reduces the production of harmful objects during combustion. Halogen is a toxic gas for humans. Halogen free means no toxic gases are released in the event of a fire.
What is the LSZH cable?
The LSZH cable can be referred to as environmental protection cable. It is suitable for the rated voltage of 450/750V and below with requirements of high safety and environmental protection of the place.. For example, are suitable for tall buildings, seasons, metros, airports, hospitals, great libraries, gyms, schools, shopping malls and other crowded places.
All or part of the sheath of the LSZH cable, the cover, outer shell and auxiliary materials (lining and padding) are composed of flame retardant material of polyethylene, so it has excellent flame retardant characteristics.
When an ordinary cable burns, releases large amounts of smoke and halogenated acid gases. Halogen acid gas will cause corrosion damage to surrounding electrical equipment. It will also have an adverse effect on rescuers and will not be conducive to rescue work in the event of a fire., which in turn will lead to more serious secondary damage.
Nevertheless, low-smoke zero-halogen cables are manufactured from flame-retardant halogen-free polyethylene material for all or part of the outer jacket and supplemental material. This makes it not only more fire retardant, but also free from halogenated acid gases when burning.
What are the characteristics of LSZH Cable?
If we want to know where low smoke zero halogen cables should be used, we must know its types and characteristics.
The tensile strength of LSZH flame retardant cables is higher than that of PVC wires and cables usually. In the case of PVC cables, the tensile strength is 1,05 kGF/mm2. While, the tensile strength of low smoke halogen-free cables is greater than 1,2 kGF/mm2.
The LSZH cable has good climatic adaptability, can withstand temperatures from -30°C to 105°C. Besides, It has excellent flexibility due to its hardness. 80 a 90. LSZH cables have high volume resistivity. Y 1012 at 1015ω/cm3 is for PVC cables and over 1016ω/cm3 is for Low Smoke Halogen Free cables.
LSZH cables have good resistance to high cable tension. They can withstand voltages greater than 15kV. They also have good elasticity and adhesiveness.
What Are The Uses Of Low Smoke Halogen Free Cable?
Low smoke zero halogen cables are becoming more popular in military applications, aircraft, railway and maritime. This is because in these areas it is often difficult to ventilate in the event of a fire..
Besides, Low smoke halogen free material is also widely used in high pressure underground tunnels or track marking lines in railway system. when using them, reduces the possibility of harmful gases accumulating in the event of a fire. In case of fire, LSZH cable jacket helps protect personnel from flames, smoke and noxious gases emitted.
What Are The Differences Between LSZH Cables And Normal Cables?
halogen
Low smoke halogen free cables do not release halogenated acid gases. Nevertheless, ordinary cables contain halogens in their insulating sheath. When a fire breaks out, large amounts of halogenated acid gas. This gas is very corrosive and can increase the spread of a fire..
There
When the LSZH cable burns, the smoke produced is very small. Instead, ordinary cables emit a lot of smoke during combustion. This hampers the work of the personnel involved and pollutes the environment.. Compared to normal insulated cables, low smoke halogen free cables emit only a very small amount of smoke. The amount of smoke emitted should also be recognized as a low smoke level.
Radius of Curvature in Laying
To further improve the electrical performance and mechanical power of the cable and ensure better power transmission quality, the bending radius of LSZH cable is larger than that of ordinary cable during laying construction.
Advantages and Disadvantages of LSZH Cable in Use
Advantages of LSZH Cables
1.Free of halogens: Low Smoke Zero Halogen cables are made with environmentally friendly insulation, coating and special materials. This means that it not only has good electrical and physical-mechanical properties, but also avoid secondary pollution by toxic combustion gases.
2.Low smoke emission and low toxicity: This type of cable uses special new sheathing materials. So, no toxic gases are produced during its production and use and it does not pollute the environment. The use of low-smoke, zero-halogen cables is essential in areas with special needs and where there is a high concentration of people.
3.Environmentally friendly: LSZH cable insulation and sheath do not contain heavy metals harmful to human, like lead and cadmium. And the cable is disposed of without contaminating the soil or water. It is more environmentally friendly than conventional cables. So, also known as green cable.
4.High flame retardancy: Green cables can meet the high fire requirements of buildings. The LSZH wires and cables are not easily combustible and prevent the spread of fire and the spread of disasters.. Especially in high-rise buildings, the use of LSZH cables can increase the rescue time and reduce the danger of harmful gases to people.
Disadvantages of LSZH Cables
The disadvantages of Low Smoke Zero Halogen cable are mainly price and popularity of use.. Although LSZH cables are environmentally friendly, its raw material and technical costs are more expensive than conventional PVC cables. Besides, due to excellent electrical conductivity, the mechanical properties and some other special properties of the ordinary wires, LSZH cables cannot completely replace ordinary cables. Nevertheless, as environmental requirements increase and technology advances, LSZH cables will develop strongly.
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