定義：火災(zāi)事故中，電線能夠在外部火焰依然燃燒的情況下，能夠堅(jiān)持一定時(shí)間的正常運(yùn)作，保持電路完整性并保持線路設(shè)備的正常運(yùn)轉(zhuǎn)，使人員及時(shí)疏散，使救援工作得以正常進(jìn)行。
耐火層材料：云母帶、陶瓷帶
使用場所：根據(jù)客戶或者設(shè)計(jì)要求，在原有電線基礎(chǔ)上增加耐火層。
技術(shù)特性：
①滿足 GB/T 19666-2019
|
代號(hào) |
適用范圍 |
試驗(yàn)時(shí)間 |
試驗(yàn)電壓 |
合格指標(biāo) |
試驗(yàn)方法 |
|
N |
0.6/1kV及以下電纜 |
90 min供火+15 min冷卻 |
額定電壓 |
1)2A熔斷器不斷 |
GB/T 19216.21 |
|
數(shù)據(jù)電纜 |
90 min供火+15 min冷卻 |
110V±10V |
1)2A熔斷器不斷 |
GB/T 19216.23 |
|
|
光纜 |
90 min供火+15 min冷卻 |
一 |
最大衰減增量由產(chǎn)品 |
GB/T 19216.25 |
②滿足 XF 306.2-2007
|
耐火級(jí)別 |
技術(shù)要求 |
|||||
|
耐火特性 |
煙氣毒性 |
煙密度（最 |
耐腐蝕性 |
|||
|
試驗(yàn)條件 |
線路完整性 |
pH值 |
電導(dǎo)率／ |
|||
|
Ⅰ級(jí) |
供火溫度:750℃~800℃ |
滿足 |
符合 |
≥80 |
≥4.3 |
≤10 |
|
IA級(jí) |
供火溫度:950℃~1000℃ |
|||||
|
Ⅱ級(jí) |
供火溫度:750℃~800℃ |
≥60 |
||||
|
ⅡA級(jí) |
供火溫度:950℃~1000℃ |
|||||
|
Ⅲ級(jí) |
供火溫度:750℃~800℃ |
符合GB/T 20285 |
≥20 |
二 |
||
|
ⅢA級(jí) |
供火溫度:950℃~1000℃ |
|||||
|
Ⅳ級(jí) |
供火溫度:750℃~800℃ |
|
— |
一 |
||
|
ⅣA級(jí) |
供火溫度:950℃~1000℃ |
|||||
③滿足 英國BS6387-2013
C：經(jīng)受950℃火焰燒180分鐘；
W：經(jīng)受650℃火焰燒15分鐘和噴水澆15分鐘；
Z：經(jīng)受950℃火焰燒和機(jī)械沖擊15分鐘。
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.
上一頁
無
下一頁