I. Structure and Characteristics
Conductor: Oxygen-free copper conductor is usually used, which has good electrical conductivity.
Insulation: Cross-linked polyethylene (XLPE) is used as the insulating material, which has excellent electrical insulation and heat resistance.
Sheath: Halogen-free, low-smoke flame retardant polyolefin material is used, which is environmentally friendly with less smoke and no halogenated acid gas release during combustion.
Filling and wrapping: low-smoke, halogen-free, flame-retardant and environmentally friendly materials are used.
II .Performance Parameters
Flame retardant performance: conform to the test conditions stipulated in GB/T18380.3-2002, the flame retardant grade is B or A grade.
Voltage resistance: with high volume resistivity, excellent voltage resistance performance.
Heat resistance: the conductor is allowed to have a long-term maximum working temperature of 90℃ or 105℃.
Mechanical properties: good resistance to high pressure, tensile, compressive and bending properties
III .The application scene
YJY low-smoke halogen-free series cables are suitable for occasions with high requirements for flame retardant performance and non-toxic environmental protection, such as:
High-rise buildings: such as hotels, hotels, office buildings, etc., to ensure personnel evacuation and fire rescue.
Subway, tunnels: subway stations, tunnels and other underground spaces to improve fire safety.
Nuclear power station, power plant: power facilities with very high requirements for flame retardant performance.
Data centers, transportation hubs: to ensure the safe operation of important facilities in a fire.
Hospitals, schools: densely populated places to ensure the safety of personnel.
Petrochemical industry: flammable and explosive environment, improve safety
Frequently Asked Questions (FAQ)
Product Knowledge
Q: What is the meaning of each letter in the model number of YJY low-smoke and low-halogen-free cable?
A: Take WDZ-YJY as an example, “W” stands for halogen-free, “D” stands for low smoke, “Z” stands for flame retardant, the first “Y W” stands for halogen-free, ‘D’ stands for low smoke, ‘Z’ stands for flame retardant, the first ‘Y’ stands for cross-linked polyethylene insulation, and the second ‘Y’ stands for polyolefin jacket. In the case of WDZN-YJY, “N” stands for fire resistant.
Q: What is the difference between YJY low-smoke and low-halogen series cables and ordinary cables?
A: YJY low-smoke, low-halogen-free series cables produce less smoke when burning, no toxic gas release, good environmental performance; good flame retardant properties, can prevent the spread of flame; insulation and sheath material performance is excellent, electrical and mechanical properties are more stable. Ordinary cables may not have these characteristics, combustion will produce a large amount of toxic smoke, flame retardancy is also poor.
Q: What are the characteristics of the insulation layer and sheath material of YJY low-smoke and low-halogen-free series cables?
A: The insulation layer adopts cross-linked polyethylene, which has high insulation, heat resistance and mechanical properties, and can effectively prevent leakage and short circuit. The sheath is halogen-free low-smoke flame-retardant polyolefin, which is halogen-free, low-smoke and non-toxic, and has good flame retardancy, corrosion resistance and flexibility.
Application Scene Class
Q: YJY low-smoke and low-halogen-free series cables are applicable to which places?
A: It is suitable for shopping malls, theaters, hospitals, schools and other densely populated places, as well as subways, high-rise buildings, data centers, libraries, archives and other places with high requirements for fire safety and environmental protection, and it can also be used in industrial fields with high requirements for cable performance.
Q: Can we use YJY low-smoke and low-halogen-free cables in humid environments?
A: Yes, the insulation and sheath materials of YJY low smoke and low halogen free series cables have certain moisture resistance properties, which can resist the influence of humid environment to a certain extent. However, in long term humid or underwater environments, it is recommended to choose armored models, such as WDZ-YJY23, WDZN-YJY23, etc., in order to provide better protection.
Selection and installation category
Q: How to choose the right specification of YJY low-smoke low-halogen-free cable?
A: According to the power of the power-using equipment, voltage level, current size to determine the cross-sectional area of the cable; consider the laying environment and mode, such as open laying, through the pipe, bridge laying, etc., select the appropriate cable structure and outer sheath; according to the place of fire prevention, flame retardant requirements, select the appropriate flame retardant grade of the cable.
Q: What do I need to pay attention to when laying YJY low-smoke, low-halogen-free series cables?
A: The ambient temperature is not less than 0℃ when laying; the bending radius should be in accordance with the regulations, the single-core cable is generally 20 (d + D) ± 5%, three-core cable is 15 (d + D) ± 5%, d is the outer diameter of the cable, D is the outer diameter of the conductor; to avoid contacting with sharp objects, to prevent scratches on the cable sheath; the cables of different flame retardant grades should not be laid side-by-side.
Performance test category
Q: How to test the low-smoke and halogen-free performance of YJY low-smoke and low-halogen-free series cables?
A: Through the combustion test, we can observe the amount of smoke, smoke concentration and toxic gas content during combustion to see if the indicators comply with the relevant standards; we can also use chemical analysis methods to detect the content of halogen in the cable material.
Q: What are the electrical performance test items of YJY low-smoke and low-halogen-free series cables?
A: Including insulation resistance test, withstand voltage test, conductor resistance test, etc.. Insulation resistance test is used to detect whether the insulation performance of the cable is good; withstand voltage test to check whether the cable can work normally under the specified voltage, with or without breakdown and other phenomena; conductor resistance test to determine whether the conductivity of the cable conductor is in line with the standard.
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