1、 WDZB-YJY23 Cable WDZB-YJY23 Low smoke halogen-free fire-resistant cable products are applicable to high-rise buildings, subways, oil platforms, computer centers, nuclear power stations, hospitals, ships Wire and cable The requirements for flame retardancy, halogen-free and low smoke performance are constantly improving. Halogen free low smoke flame retardant power cable It has excellent mechanical and physical properties, electrical properties, flame retardancy, halogen free, low smoke generation and other characteristics. It is suitable for fixed laying of power transmission and distribution lines with special requirements for fire safety. The performance of cable products shall be in accordance with GB/T12706-2002 Out of standard, combustion performance meets IEC332 , IEC 754 and IEC1034 Requirements specified in the standard.
II, WDZB-YJY23 Cable WDZB-YJY23 Use characteristics of low smoke halogen-free fire-resistant cable:
one , rated temperature of cable conductor is 90℃ 。
two , in case of short circuit ( Long duration not more than five second ) , the temperature of cable conductor shall not exceed 250℃ 。
three , the ambient temperature during cable laying shall not be lower than 0℃ 。 When laying, the small bending radius shall not be less than eight times ( External meridian 40mm And below ) and twelve times ( External meridian 40mm above ) 。
III, WDZB-YJY23 Cable WDZB-YJY23 Low smoke halogen-free fire-resistant cable according to GB/T18380.3-2002 Under the specified test conditions, the flame retardant grade of LSZH cable is divided into A , B , C , D Four levels.
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Flame retardant grade
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Fire supply temperature
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Fire supply time
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Cable bundle laying Metallic materials volume
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Carbonization height
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Self information time
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A
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≥815℃
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40min
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≥ 7 l/m
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≤ 2.5m
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≤1h
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B
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≥815℃
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40min
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≥ 3.5 l/m
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≤ 2.5m
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≤1h
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C
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≥815℃
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20min
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≥ 1.5 l/m
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≤ 2.5m
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≤1h
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D
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≥815℃
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20min
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≥ 0.5 l/m
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≤ 2.5m
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≤1h
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4、 Service characteristics of low smoke halogen-free cable
. Power frequency rated voltage Uo/U by 0.6/1KV
. Allowable working temperature of cable conductor: 90°C 。
. In case of short circuit ( Not more than for a long time 5S) The temperature of cable conductor shall not exceed 250°C 。
. The ambient temperature during cable laying shall not be lower than 0°C 。
. Cable bending diameter: three core cable shall not be less than the cable outer diameter fifteen times ; Single core cable shall not be less than the cable outer diameter twenty Times.
5、 Selection of rated voltage for low smoke halogen-free cable
. The rated voltage of the cable shall be suitable for the operating conditions of the cable system Uo/U (Um) KV
Uo- Rated power frequency voltage between conductor and ground or metal shield for cable design ;
U- Rated power frequency voltage between conductors for cable design ;
Um- Affordable “ system voltage " The value of.
