耐火电缆的耐火等级?

2025-03-28 09:27:46
推荐回答(5个)
回答1:

IEC耐火等级
耐火线缆指在火焰燃烧的情况下能保持一定时间的正常运行,即保持线路的完整性(CircuitIntegrity)。为了评定线缆的阻火性能优劣,国际电工委员会和英国电工委员会分别制定了IEC331和BS6387两个标准。相比之下BS6387在耐火能力的要求上较IEC331高得多。
IEC60331阻燃等级
IEC60331-1999中,供火温度要求为750℃/3h级,表示在750℃下施加300伏电压水平燃烧3小时不击穿。
BS6387阻燃等级
BS6387要求通过水平燃烧实验、水喷淋实验和机械冲击震动燃烧实验。水平燃烧实验为A级650℃/3h、B级750℃/3h、C级950℃/3h和S级950℃/3min.
A级表示在650℃下施加300伏电压水平燃烧3小时不击穿;B级表示在750℃下施加300伏电压水平燃烧3小时不击穿;C级表示在950℃下施加300伏电压水平燃烧3小时不击穿;S级表示在950℃下施加300伏电压水平燃烧3分钟不击穿。
水喷淋燃烧实验分为W级,表示在施加300伏电压燃烧15分钟然后再淋水燃烧15分钟不击穿。冲击震动燃烧实验分为X级650℃/15min、Y级750℃/15min和Z级950℃/15min、X级表示在650℃下施加300伏电压一边燃烧一边每30秒机械冲击震动15分钟不击穿;Y级表示在750℃下施加300伏电压一边燃烧一边每30秒机械冲击震动一次15分钟不击穿;Z级表示在950℃下施加300伏电压一边燃烧一边每30秒机械冲击震动一次15分钟不击穿。BS6387要求的最高级别型号为CWZ

回答2:

01

防火电线

防火电线,即在规定试验条件下,试样被燃烧,在撤去试验火源后,火焰的蔓延仅在限定范围内,残焰或残灼在限定时间内能自行熄灭的电线,在火灾情况下有可能被烧坏而不能运行,但可阻止火势的蔓延。通俗地讲,电线万一失火,能够把燃烧限制在局部范围内,不产生蔓延,保住其他的各种设备,避免造成更大的损失。那么这四类防火电线有什么区别呢?我们先来简单了解下。

02

阻燃电线

阻燃电线的特点是延缓火焰沿着电线蔓延使火灾不致扩大。由于其成本较低,因此是防火电线中大量采用的电线品种。无论是单根线缆还是成束敷设的条件下,电线被燃烧时能将火焰的蔓延控制在一定范围内,因此可以避免因电线着火延燃而造成的重大灾害,从而提高电线线路的防火水平。

03

无卤低烟阻燃电线

无卤低烟电线的特点是不仅具有优良的阻燃性能,而且构成低烟无卤电线的材料不含卤素,燃烧时的腐蚀性和毒性较低,产生极少量的烟雾,从而减少了对人体、仪器及设备的损害,有利于发生火灾时的及时救援。无卤低烟阻燃电线虽然具有优良阻燃性、耐腐蚀性及低烟浓度,但其机械和电气性能比普通电线稍差。

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04

低卤低烟阻燃电线

低卤低烟阻燃电线的氯化氢释放量和烟浓度指标介于阻燃电线与无卤低烟阻燃电线之间。低卤电线的材料中亦会含有卤素,但含量较低。这种电线的特点是不仅具备阻燃性能,而且在燃烧时释放的烟量较少,氯化氢释放量较低。这种低卤低烟阻燃电线一般以聚氯乙烯(PVC )为基材,再配以高效阻燃剂、HCL 吸收剂及抑烟剂加工而成。因此这种阻燃材料显著改善了普通阻燃聚氯乙烯料的燃烧性能。

05

耐火电线

耐火电线是在火焰燃烧情况下能保持一定时间的正常运行,可保持线路的完整性。耐火阻燃电线燃烧时产生的酸气烟雾量少,耐火阻燃性能大大提高,特别是在燃烧时,伴随着水喷淋和机械打击震动的情况下,电线仍可保持线路完整运行。

回答3:

在中国普通耐火电缆分为A类和B类:B类电缆能够在750℃~800℃的火焰中和额定电压下耐受燃烧至少90min而电缆不被击穿(即3A保险丝不熔断)。在改进耐火层制造工艺和增加耐火层等方法的基础上又研制了A类耐火电缆,它能够在950℃~1 000℃的火焰中和额定电压下耐受燃烧至少90min而电缆不被击穿(即3A保险丝不熔断)。A类耐火电缆的耐火性能优于B类。

回答4:

阻燃电缆分为A、B、C、D四级,耐火电缆没有级别之分。只有试验参数:
根据GB/T12666.6-1990(耐火试验)
供火温度750°+50 -0,供火时间90min,2A熔丝不断为合格。

回答5:

阻燃电缆的特点是延缓火焰沿着电缆蔓延使火灾不致扩大。由于其成本较低,因此是防火电缆中大量采用的电缆品种。无论是单根线缆还是成束敷设的条件下,电缆被燃烧时能将火焰的蔓延控制在一定范围内,因此可以避免因电缆着火延燃而造成的重大灾害,从而提高电缆线路的防火水平。

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