First, low-smoke halogen-free cable is what cable?
As the name suggests: low smoke, that is, to reduce the production of harmful objects in the combustion; halogen for the human body is a toxic gas, halogen-free is no release of toxic gases, usually for the cable in case of fire.
Low-smoke halogen-free cable can also be called environmentally friendly cable, low-smoke halogen-free cable is mostly used in hospitals and more stringent requirements for environmental health places.
Second, low-smoke halogen-free cable applications:
Building electrical field:
Low-smoke halogen-free cables are widely used in building wire and cable systems, including power supply and distribution, lighting, air conditioning, fire protection facilities.
Due to its combustion with less smoke, it can provide better visibility and help evacuation and rescue in case of fire.
Communication field:
Being used for the wiring of communication equipment and network systems, such as indoor fiber optic cables, outdoor fiber optic cables, fiber optic termination boxes, splitter boxes, and so on.
Used in communication rooms and data centers, etc., it can reduce smoke obstruction and improve rescue efficiency.
Transportation field:
In urban rail transportation such as subway, light rail, high speed rail, etc., it is used for the connection of signal control, communication, power supply and other equipment.
In these densely populated places, low-smoke halogen-free cables can improve escape safety.
Oil, petrochemical, natural gas field:
Petroleum, petrochemical, natural gas industry has very high safety requirements, low smoke halogen-free cables are widely used in petroleum, petrochemical, natural gas installations in the electrical equipment and instrumentation control system because they do not contain halogen components, which can reduce the release of harmful gases.
Metallurgical field:
In the smelting process, low-smoke halogen-free cables can prevent the spread of fire due to their good flame retardant properties, thus guaranteeing the normal operation of the smelting process and the safety of personnel.
Nuclear power field:
Nuclear power plant is a high-risk industry, which requires strict safety and reliability of cables. The fire-resistant, smoke-proof and low-toxicity characteristics of low-smoke halogen-free cables make them an ideal choice for nuclear power plant cables.
Other fields:
Low-smoke halogen-free flame retardant cables are also widely used in high-rise buildings, shopping malls, hospitals, schools, large transportation buildings (such as airports and stations), marine vessels, large and medium-sized stadiums, as well as in important public places such as medical care, finance, education, exhibitions, museums, and buildings for the elderly.
Third, how to identify high-quality low-smoke halogen-free power cables?
Products on the market are mixed, as many as hair, how to identify high-quality low-smoke halogen-free cable TST CABLES to give you some professional reference advice.
Identification mainly lies in the identification of insulation materials:
- Burning method
Based on whether the material is easy to burn, to determine whether it is flame-retardant wire – ZRBV or flame-retardant power cable – ZRYJV, according to whether the combustion, to identify the color of the flame; whether the smoke, the amount of smoke to determine whether it is a low-smoke halogen-free power cables – WDZ – YJV, if there is, to identify the color of the smoke, such as: smoke for the smoke or smoke containing charcoal ash; whether there is a drop of sol, if there is a look at the sol to see whether to continue burning And what kind of odor is produced when burning.
- Teflon cable: softening and deformation in the event of fire, a thin layer of Zouqu, a small amount of char, slightly charred hair flavor, non-combustible.
- PVC cable: green flame mask, softening white smoke and hydrochloric acid flavor, self-extinguishing plastic; placed in water, sinking.
- PE cable: blue light cover, burning area melting transparent, molten glue drops and candle smell; placed in water, floating.
- PP cable: blue light cover, burning area is melting and transparent, with molten glue dripping and kerosene smell; placed in water, floating.
- PU cable: black smoke, with molten glue dripping, no burnt ash, nitrogen oxide odor, prolonged burning.
- Nylon cable: blue light cover, molten, hair burning smell, self-extinguishing.
- Silicone cable: odorless, thick white smoke, white residual ash powder, self-extinguishing.
- Specific gravity method
Density comparison method, that is, the density of water as a benchmark, the plastic material placed in water, if sinking, the plastic density than water, if floating, is smaller than water. This method can be used in conjunction with other methods.
The above two, simple test flame retardant power cables, flame retardant wires, low smoke halogen-free power cables, low smoke halogen-free wires.
Fourth, low-smoke halogen-free wires and cables with machine settings
Low-smoke halogen-free wire and cable commonly used machine configuration: low-smoke halogen-free wire and cable with the machine is a dense practice 55 liters; double wrist feeding plus 120 single screw; hydraulic plate automatic screen change; push-pull type on the blowing head; grinding surface air-cooled hot cutting – the first cyclone separator – the second Cyclone separator – lengthened air-cooled vibrating screen – silo; must use the dense trainer in order to M (OA) 3 and the base material EVA better compatible together; if you only use the twin-screw to do it will be dispersed poorly; with the double wrist feeding the advantages of the material in the feed Material and mixing once; this is a very good guarantee of the quality of the material; this configuration output is about 350 kilograms per hour or so; now a lot of large factories are using this production process.
Low-smoke halogen-free wire and cable another machine configuration: with machinery is 55 liters of dense trainer; cone double feeder plus 65 twin screw; hydraulic plunger automatic screen change; air-cooled grinding surface hot cutting – the first cyclone separator – the second cyclone separator –Extended air-cooled vibrating screen – silo; this configuration output is about 250 kilograms per hour.
In addition there is a configuration: dense practice plus cone double feeding plus double-step granulation; this equipment is more expensive.
Fifth, halogen-free low-smoke flame retardant cable grade classification
Halogen-free low-smoke flame retardant cable is divided into A, B, C three grades, the higher the grade, the better the fire performance. Specifically described as follows:
Halogen-free flame retardant cable
- Grade A halogen-free low-smoke flame-retardant cables: flame retardant grade A, suitable for occasions requiring high fire performance, such as high-rise buildings, large shopping malls, hospitals and other public occasions.
- Grade B halogen-free low-smoke flame retardant cables: flame retardant grade B, suitable for occasions requiring high fire performance, such as small shopping malls, hotels, apartments and other places.
- Halogen-free low-smoke flame-retardant cables of class C: the flame retardant grade is class C, suitable for occasions requiring a certain degree of fire performance, such as residential, home office and other places.
VI. Occasions and characteristics of each grade
- Class A halogen-free low-smoke flame-retardant cables
Class A halogen-free low-smoke flame-retardant cables have the best flame-retardant performance and are suitable for high-risk occasions such as crowded places, closed places, and difficult escape with the following characteristics:
(1) Very good flame retardant properties, can effectively prevent the spread of fire, to protect the safety of personnel.
(2) Long service life, with good durability and anti-aging properties.
(3) Wide range of application, can be used in various buildings and external power system wiring.
- Class B halogen-free low-smoke flame-retardant cable
Class B halogen-free low-smoke flame-retardant cables are inferior to Class A cables in terms of flame-retardant performance, but they can still meet certain fire safety requirements and are suitable for the following occasions:
(1) Densely populated places with high degree of closure, such as small shopping malls, hotels, apartments and so on.
(2) The needs of some special industries, such as airports, railway stations, subways and other places of public transportation.
- Class C halogen-free low-smoke flame-retardant cable
Class C halogen-free low-smoke flame-retardant cables have poorer flame retardant properties, but can still meet certain fire safety requirements, and are suitable for the following occasions:
(1) Some small residences, home offices and other places.
(2) Temporary power needs of low-risk places, such as construction sites.
VII,Low-smoke halogen-free flame-retardant cable load definition and calculation formula
The fire load of low-smoke halogen-free flame-retardant cable can be understood as the maximum load that the cable can withstand, which is usually related to the current carrying capacity of the cable. The formula for calculating the load can be adapted to the specific situation, but in general, the following formula can be considered for calculating the load of aluminum core cable wires:
Load (kW) = √3 × U × I × cosφ / 1000
Where √3 is the coefficient of the three-phase voltage, U is the voltage (V), I is the current (A), and cosφ is the power factor. This formula can help us calculate the load of the cable according to its voltage, current and power factor.
Eight, the price of low-smoke halogen-free wire and cable
General high-quality low-smoke halogen-free wire (Lszh) cable prices relative to ordinary cables to be higher than 10% – 20% or so.
The main reason: First, raw materials are more expensive than ordinary wire and cable; Second, in the production of machine settings, low-smoke halogen-free wire and cable production time required than the normal wire and cable more than about 30% – 50% or so, the efficiency is relatively low, resulting in an increase in costs. Third, the process is more delicate and complex than normal cables, the factory process is higher and stricter than the specifications of normal cables.
Halogen-free low-smoke flame retardant cable is a type of cable with better fire protection performance and has a wide range of applications.TST CABLES suggests that when you choose halogen-free low-smoke flame retardant cables, you need to choose the appropriate grade according to the specific occasion and demand. If you want to know the price or are not sure what grade of low smoke and halogen free cable you should choose, please feel free to send an email to talk to us and we can come up with a solution for you the same day.
TSTCABLES is the world’s leading manufacturer of high quality Lszh cables
TSTCABLES‘ new low-smoke, halogen-free cable takes cable safety to new heights! It is made of unique halogen-free materials, completely abandoning the toxic fumes that may be produced in traditional cables, and even in extreme situations, it maintains low smoke and no toxic gas release, maximizing the safety of personnel. Its excellent flame retardant design effectively slows down the spread of fire, buying valuable time for emergency evacuation and rescue. Choosing TSTCABLES low smoke and halogen free cable is choosing a safe, secure and stable electricity environment, you are welcome to contact us by email if you have demand for high quality low smoke and halogen free flame retardant cables or would like to know about LSZH cable purchase,LSZH cable service,LSZH cable solution!
