Jiangsu QiSheng Cable Co., Ltd.
Model No.: NH-YJV3x4
Conductor Type: Stranded
Application: Underground, Heating, Overhead
Conductor Material: Copper
Sheath Material: PVC
Insulation Material: PVC
Material Shape: Round Wire
Range of Application: Flame Retardant
Certification: CCC, ISO9001
Productivity: 2400K KM/Y
Place of Origin: CHINA
Supply Ability: 200K KM/M
Main technical parameters of NH-YJV product:
Calculation of cable current carrying capacity
The conductor operating temperature: 90°C
When the cable is buried in the ground, the soil thermal resistance coefficient is g = 1.0 oC.m/W, but the phenomenon that the soil thermal resistance coefficient increases due to water migration during long-term operation of the cable has not been considered.
When the cable is buried, the cable's center distance is S=3D.
Copper-core cross-linked polyethylene insulation laid in indoor, PVC sheathed power cables, tunnels and pipelines can withstand a certain degree of laying traction, but the cable can not withstand mechanical external forces, does not allow single-core cables laid in the magnetic material pipeline.
Copper-core cross-linked polyethylene insulation, PVC sheathed steel tape armored power cables laid in indoor tunnels and laid underground cables can withstand mechanical external forces, but can not withstand large tensile forces, single-core cables can not be used in Communication occasions.
NH-YJV cable introduction
The fire-resistant cable is a cable that can operate safely for a certain period of time in the presence of a flame. China's national standard is GB12666.6, the fire test is divided into A, B, the two levels.1.The extra voltage U0/U is 0.6/IKV.
2.The maximum rated temperature of the cable conductor is 90°C.
3.When Short circuit (Over 5S for the longest duration), the electrical conductor temperature of the cable conductor does not exceed 250°C.
4.The ambient temperature at which the cable is laid shall not be less than 0, and its minimum bending diameter shall be as follows:
Single-core cable -20 (D+d), mm
Multi-core cable -15(D+d), mm
(D, d are the nominal diameter of the outer diameter of the cable and the main conductor, respectively, the unit is mm)
NH-YJV3x4 Square National Standard Parameter Description
Certify: CCC Current: AC Cable Voltage level: Medium and low voltage power cables
Insulation material: PVC Purpose: building Type: Nh-yjv
PSPC.: 3X4mm2 Trademark: SHUAIHE Package: 100meter/roll
Classification of fire-resistant cables NH-YJV
In China, ordinary fire-resistant cables are classified into Class A and Class B: Class B cables can withstand fire for at least 90 minutes in a flame at 750°C to 800°C and at a rated voltage and the cable is not broken down (ie, the fuse is not blown). On the basis of improving the manufacturing process of the fire-retardant layer and increasing the refractory layer, a Class A fire-retardant cable was also developed. It can withstand the fire for at least 90 minutes and the cable is not broken down in the flame at 950°C to 1 000°C and at the rated voltage. (ie 3A fuse is not blown).
Class A fire-resistant cables have better fire resistance than Class B. In addition, the mineral insulated cable is a kind of excellent performance in the fire-resistant cable. It is made of copper core, copper sheath, and magnesium oxide insulating material, and is abbreviated as MI (minerl insulated cables) cable. The cable is entirely composed of inorganic materials, and the refractory layer of ordinary fire-resistant cables is composed of inorganic materials and common organic compounds. Therefore, the MI cable has better fire resistance than ordinary fire-resistant cables and does not decompose due to combustion. gas. MI cable has good fire resistance and can work under high temperature of 250°C for a long time. It also has explosion-proof, strong corrosion resistance, large current carrying capacity, radiation resistance, high mechanical strength, small size, light weight, long service life, and no smoke. specialty. However, the price is expensive, the process is complicated, and the construction is difficult. In the oil-filled areas, important wooden structure public buildings, high-temperature places and other fire-resistant requirements and economical acceptable conditions, this kind of fire-resistant cable can be used.
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