耐(nai)(nai)火(huo)(huo)性(xing)能(neng)是(shi)指母(mu)(mu)线槽(cao)(cao)除了必须具有阻燃性(xing)能(neng)和防火(huo)(huo)性(xing)能(neng)外，还要(yao)(yao)(yao)求(qiu)母(mu)(mu)线槽(cao)(cao)在火(huo)(huo)灾(zai)(zai)时能(neng)够维持电(dian)(dian)路的完整性(xing)。GB7251.2-2006没(mei)有对耐(nai)(nai)火(huo)(huo)试验(yan)项目提(ti)出要(yao)(yao)(yao)求(qiu)。GA/T537-2005要(yao)(yao)(yao)求(qiu)母(mu)(mu)线干线系统（母(mu)(mu)线槽(cao)(cao)）耐(nai)(nai)火(huo)(huo)性(xing)能(neng)试验(yan)应(ying)同时进行喷(pen)淋试验(yan)和耐(nai)(nai)火(huo)(huo)性(xing)能(neng)验(yan)证，两项试验(yan)均合格方可判定(ding)其耐(nai)(nai)火(huo)(huo)性(xing)能(neng)合格。这(zhei)是(shi)因为火(huo)(huo)灾(zai)(zai)发(fa)生(sheng)(sheng)时，耐(nai)(nai)火(huo)(huo)母(mu)(mu)线槽(cao)(cao)应(ying)能(neng)承受消防龙头(tou)救火(huo)(huo)喷(pen)水的冲(chong)击，不应(ying)发(fa)生(sheng)(sheng)母(mu)(mu)线间的短路，电(dian)(dian)路供电(dian)(dian)不应(ying)中断，即耐(nai)(nai)火(huo)(huo)母(mu)(mu)线槽(cao)(cao)的外壳防护等级(ji)要(yao)(yao)(yao)达到IP6X级(ji)别。
GA/T537-2005附录A规定(ding)了喷淋(lin)试(shi)(shi)验(yan)(yan)(yan)(yan)方(fang)法，包(bao)括(kuo)试(shi)(shi)验(yan)(yan)(yan)(yan)装(zhuang)(zhuang)置、试(shi)(shi)验(yan)(yan)(yan)(yan)条(tiao)(tiao)件(jian)(jian)、试(shi)(shi)验(yan)(yan)(yan)(yan)要(yao)求、安(an)装(zhuang)(zhuang)、试(shi)(shi)验(yan)(yan)(yan)(yan)程序和(he)判定(ding)条(tiao)(tiao)件(jian)(jian)。试(shi)(shi)验(yan)(yan)(yan)(yan)应(ying)在一(yi)个合适的(de)(de)箱(xiang)体（或试(shi)(shi)验(yan)(yan)(yan)(yan)室）内进行，该箱(xiang)体（或试(shi)(shi)验(yan)(yan)(yan)(yan)室）应(ying)具有处(chu)理燃(ran)烧产生的(de)(de)任何有害气体的(de)(de)设施，并(bing)有足够的(de)(de)通风来维持试(shi)(shi)验(yan)(yan)(yan)(yan)过(guo)程中的(de)(de)火焰，箱(xiang)体（或试(shi)(shi)验(yan)(yan)(yan)(yan)室）外部环境温度应(ying)保证在5~40℃之间，喷淋(lin)试(shi)(shi)验(yan)(yan)(yan)(yan)后，保持电压，即没(mei)有一(yi)个熔断器或断路(lu)器断开，导体不(bu)断，即灯泡一(yi)个也(ye)不(bu)熄灭，则表(biao)明线路(lu)未丧失完整(zheng)性，试(shi)(shi)件(jian)(jian)喷淋(lin)试(shi)(shi)验(yan)(yan)(yan)(yan)合格。
耐火性(xing)能试(shi)(shi)(shi)(shi)验(yan)(yan)(yan)中的(de)试(shi)(shi)(shi)(shi)验(yan)(yan)(yan)装置、试(shi)(shi)(shi)(shi)验(yan)(yan)(yan)条件(jian)、测量(liang)与观察(cha)，GA/T537-2005基本引用GB/T9978一1999的(de)相关(guan)要求，但对于受(shou)火条件(jian)、试(shi)(shi)(shi)(shi)件(jian)要求、安(an)装、试(shi)(shi)(shi)(shi)验(yan)(yan)(yan)程(cheng)序和判定条件(jian)，GA/T537-2005做出了详细的(de)规定，如要求试(shi)(shi)(shi)(shi)件(jian)为(wei)四(si)面受(shou)火（实际工(gong)程(cheng)有(you)特殊要求的(de)除(chu)外(wai)），试(shi)(shi)(shi)(shi)件(jian)为(wei)三相四(si)线(xian)制或三相五线(xian)制直线(xian)型(xing)母线(xian)干线(xian)耐火单元，受(shou)火段长度至少为(wei)4m，并含有(you)一个(ge)接(jie)头(tou)(tou)。试(shi)(shi)(shi)(shi)件(jian)安(an)装时，试(shi)(shi)(shi)(shi)件(jian)两端(duan)支(zhi)(zhi)承(cheng)在(zai)耐火试(shi)(shi)(shi)(shi)验(yan)(yan)(yan)炉(lu)(lu)炉(lu)(lu)壁上，两端(duan)伸出试(shi)(shi)(shi)(shi)验(yan)(yan)(yan)炉(lu)(lu)长度均不(bu)(bu)小于500mm并用不(bu)(bu)燃性(xing)隔热材料封堵两端(duan)；应使(shi)试(shi)(shi)(shi)(shi)件(jian)接(jie)头(tou)(tou)处(chu)在(zai)炉(lu)(lu)中间(jian)，在(zai)接(jie)头(tou)(tou)两侧各设置一个(ge)支(zhi)(zhi)撑，并保持其间(jian)距不(bu)(bu)小于1000mm，该(gai)支(zhi)(zhi)撑由试(shi)(shi)(shi)(shi)验(yan)(yan)(yan)单位统(tong)一提供，并使(shi)炉(lu)(lu)顶距试(shi)(shi)(shi)(shi)件(jian)的(de)距离不(bu)(bu)小于150mm；为(wei)了检验(yan)(yan)(yan)试(shi)(shi)(shi)(shi)件(jian)线(xian)路的(de)完整性(xing)，应进行必要的(de)电气连接(jie)。
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