定义：火灾事故中，电线能够在外部火焰依然燃烧的情况下，能够坚持一定时间的正常运作，保持电路完整性并保持线路设备的正常运转，使人员及时疏散，使救援工作得以正常进行。
耐火层材料：云母带、陶瓷带
使用场所：根据客户或者设计要求，在原有电线基础上增加耐火层。
技术特性：
①满足 GB/T 19666-2019
|
代号 |
适用范围 |
试验时间 |
试验电压 |
合格指标 |
试验方法 |
|
N |
0.6/1kV及以下电缆 |
90 min供火+15 min冷却 |
额定电压 |
1)2A熔断器不断 |
GB/T 19216.21 |
|
数据电缆 |
90 min供火+15 min冷却 |
110V±10V |
1)2A熔断器不断 |
GB/T 19216.23 |
|
|
光缆 |
90 min供火+15 min冷却 |
一 |
最大衰减增量由产品 |
GB/T 19216.25 |
②满足 XF 306.2-2007
|
耐火级别 |
技术要求 |
|||||
|
耐火特性 |
烟气毒性 |
烟密度（最 |
耐腐蚀性 |
|||
|
试验条件 |
线路完整性 |
pH值 |
电导率／ |
|||
|
Ⅰ级 |
供火温度:750℃~800℃ |
满足 |
符合 |
≥80 |
≥4.3 |
≤10 |
|
IA级 |
供火温度:950℃~1000℃ |
|||||
|
Ⅱ级 |
供火温度:750℃~800℃ |
≥60 |
||||
|
ⅡA级 |
供火温度:950℃~1000℃ |
|||||
|
Ⅲ级 |
供火温度:750℃~800℃ |
符合GB/T 20285 |
≥20 |
二 |
||
|
ⅢA级 |
供火温度:950℃~1000℃ |
|||||
|
Ⅳ级 |
供火温度:750℃~800℃ |
|
— |
一 |
||
|
ⅣA级 |
供火温度:950℃~1000℃ |
|||||
③满足 英国BS6387-2013
C：经受950℃火焰烧180分钟；
W：经受650℃火焰烧15分钟和喷水浇15分钟；
Z：经受950℃火焰烧和机械冲击15分钟。
Information about this document
This is a full revision of the standard, which now gives only a test method for fire resistance characteristics of cables. Physical and electrical tests and their relevant requirements are now given in the appropriate product standards.Other test methods for the fire resistance of cables have been developed since the previous revision of BS 6387. These include BS 8434 and BS 8491, catering for specific applications, installations and end-user markets.
The test method given in this British Standard consists of three component protocols, designated C. W and Z. These are technically unchanged from the previous edition. Previous editions of BS 6387 have included categories based on other protocols(A,B,S,X and Y). These are now regarded as obsolete.
When separate test pieces from the same sample of cable are tested to each of these three protocols, these together comprise the full test. When the requirements of each one of the protocols are met, the cable may be designated as"category CWZ". In detail:
a) Protocol C subjects the cable under test to a flame via direct impingement corresponding to a temperature attack of 950℃±40℃.
b) Protocol W subjects the cable under test to a flame via direct impingement corresponding to a temperature attack of 650°C ±40°C with direct application of water simulating a sprinkler system.
c) Protocol Z subjects the cable under test to a flame via direct impingement corresponding to a temperature attack of 950°C±40°C with indirect application of mechanical shock.
Product standards might refer to only one of the protocols C or W or Z in.respectively, Clauses 6,7 or 8 but, in such cases, may not use the designation "Category CWZ".
It is emphasized that fire tests do not assess a fire hazard, nor can the results of fire tests alone guarantee safety. They only provide information to assist in the assessment of the suitability of a cable for a given application.
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