Low smoke zero halogen (LSZH) wire has been in use since 1970. What do we mean by zero-halogen wire? This type of wire is devoid of any chemical elements classified as halogens, such as bromine, chlorine, and fluorine. Halogens are significant fire retardants and are often added to naturally halogen-free materials to enable cables to pass industry flame tests. The objective behind insulating wires and cables with low smoke and zero halogens is to minimize the production of obscuring, dense, and toxic gases during a fire. To ensure safety, wire manufacturers have been producing LSZH wire that demonstrates high resistance to fire while maintaining superior performance.
What Is A Low Smoke Zero Halogen (LSZH) Cable Wire?
Low smoke zero halogen (LSZH) wire is a type of wire that emits minimal or no poisonous gases or fumes upon exposure to fire. In the event of a fire, this type of wire enhances safety and ease of escape in a smoky and burning environment. While LSZH cable wires offer the advantages of low smoke emission and corrosion resistance, they come with notably reduced mechanical and electrical properties. Consequently, manufacturers ensure that when installing LSZH wire, the wire’s bending radius is larger than that of ordinary wire.
Features of
A low smoke zero halogen (LSZH) wire is capable of transmitting power at a voltage of 600V and can endure a maximum heat temperature of 90°C in both dry and wet conditions. This type of wire is resistant to direct sunlight, abrasion, chemicals, and harsh weather.
When purchasing an LSZH cable wire, it is important to verify that it is rated according to ICEA 2-95-658 (WC70) and ICEA S-73-532 standards and meets the specific requirements approved by UL 1685. Additionally, the wire should have successfully passed the IEEE 383 flame test to confirm its low smoke zero halogen properties.
While LSZH wire is more expensive and less flexible compared to PVC wire, it does not come with many restrictions due to its reduced flexibility. According to the EN50167, EN50168, and EN50169 standards, an LSZH wire should be halogen-free.
Difference between LSZH and PVC Wire
Upon visual inspection, LSZH (Low Smoke Zero Halogen) and PVC wires differ significantly. You will notice that the patch cord of LSZH wire is more robust and rigid, whereas the PVC patch cord is softer. The rigidity of the LSZH wire’s patch cord is due to its flame retardant components, which also add to its aesthetic appeal.
PVC wires, being manufactured from polyvinyl chloride, can produce heavy black smoke, hydrochloric acid, and other toxic gases when burned. In contrast, low smoke zero halogen wire does not produce smoke or toxic gases upon burning.
Applications of a Low Smoke Zero Halogen Wire
Typically, low smoke zero halogen (LSZH) wire is utilized in poorly ventilated areas such as ships, ocean liners, airplanes, submarines, cargo holds, offshore installations, and containers. LSZH wires are also employed in mass transmission systems and central office facilities. Various telecommunication standards adopt LSZH cable wire due to the sensitivity of their electronic equipment.
Conclusion
Low smoke zero halogen (LSZH) wire finds a wide range of applications in the transportation, communication, and industrial sectors. Its durability and non-production of toxic gases during combustion make it a preferred choice. It is a crucial type of wire to have for your safety in the event of fire accidents. For more details about LSZH wire, please consult with us, and we are here to provide the necessary assistance.