消防(fang)應(ying)急(ji)燈(deng)的四線(xian)(xian)(xian)(xian)制中應(ying)該(gai)如何加強啟線(xian)(xian)(xian)(xian)?從(cong)安(an)全上考慮，接(jie)(jie)線(xian)(xian)(xian)(xian)時按照規范要(yao)求必(bi)須有(you)接(jie)(jie)地線(xian)(xian)(xian)(xian)(接(jie)(jie)消防(fang)應(ying)急(ji)日光燈(deng)外殼)。一(yi)(yi)般情況，應(ying)急(ji)電(dian)源兩根白線(xian)(xian)(xian)(xian)接(jie)(jie)節能燈(deng)，紅線(xian)(xian)(xian)(xian)接(jie)(jie)長明線(xian)(xian)(xian)(xian)，黑線(xian)(xian)(xian)(xian)接(jie)(jie)開關火(huo)線(xian)(xian)(xian)(xian)，藍線(xian)(xian)(xian)(xian)接(jie)(jie)零線(xian)(xian)(xian)(xian)。(也有(you)些產品電(dian)線(xian)(xian)(xian)(xian)用色不一(yi)(yi)樣，具體還是要(yao)看應(ying)急(ji)電(dian)源上的接(jie)(jie)線(xian)(xian)(xian)(xian)標識(shi))。安(an)裝和普(pu)通(tong)筒(tong)燈(deng)一(yi)(yi)樣，只是多加了個應(ying)急(ji)電(dian)源放在天(tian)花板上面。

　　消防應急燈(deng)燈(deng)，和普通(tong)吸頂燈(deng)安裝(zhuang)方(fang)式一(yi)(yi)樣。接(jie)線：開關線接(jie)燈(deng)頭，長(chang)明線接(jie)應急電源線。零線共(gong)用(yong)。共(gong)4根(gen)(gen)線：一(yi)(yi)根(gen)(gen)直接(jie)接(jie)火線(消防狀(zhuang)態及日常充電線)，一(yi)(yi)根(gen)(gen)通(tong)過(guo)開關接(jie)開關線(正常照明)，一(yi)(yi)根(gen)(gen)接(jie)零，一(yi)(yi)根(gen)(gen)接(jie)地(di)。

　   消防應急燈工作(zuo)原(yuan)理：

　　1、電池充電電路(lu)

　　外電(dian)(dian)源經Q2，Q6，R8，D10對電(dian)(dian)池(chi)進行(xing)恒流(liu)(liu)充電(dian)(dian)。當有外電(dian)(dian)源供電(dian)(dian)時，充電(dian)(dian)電(dian)(dian)流(liu)(liu)經R8，D10向電(dian)(dian)池(chi)充電(dian)(dian)，且使充電(dian)(dian)指示燈D12點亮。

　　2、燈控制電路

　　由Q3，仍、Q5、Q7和(he)(he)鍵K，G構成，在無市電(dian)時(shi)，按一下K(開)鍵，Q5飽和(he)(he)導通(tong)(tong)，Q5的集電(dian)極電(dian)流通(tong)(tong)過(guo)R12使Q7維(wei)持導通(tong)(tong);D11反向擊穿工(gong)作在穩壓狀態，Q5的集電(dian)極電(dian)壓給Q3，Q4提(ti)供偏置(zhi)使其(qi)導通(tong)(tong)，點亮L1、L2。當按一下G(關(guan))鍵時(shi)，Q7截(jie)止，撤除了(le)Q5導通(tong)(tong)條件，燈關(guan)閉。

　　3、試驗電路

　　當按住(zhu)試驗按鍵S不放時，Ql截止，D7負極電位(wei)變低(di)而正偏(pian)導(dao)通，使(shi)Q5導(dao)通滿足點(dian)燈(deng)條件(jian)，使(shi)L1、L2點(dian)亮(liang)。松開S鍵燈(deng)隨(sui)即熄滅(mie)。試驗電路的作(zuo)用是測試點(dian)燈(deng)電路是否(fou)正常(chang)。

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