消防(fang)(fang)應急燈(deng)的四線(xian)(xian)(xian)(xian)制中(zhong)應該如何加強啟線(xian)(xian)(xian)(xian)?從安全上考慮，接線(xian)(xian)(xian)(xian)時按照規范要求必須有(you)接地(di)線(xian)(xian)(xian)(xian)(接消防(fang)(fang)應急日光燈(deng)外殼)。一(yi)般(ban)情況，應急電(dian)源兩(liang)根白線(xian)(xian)(xian)(xian)接節能(neng)燈(deng)，紅線(xian)(xian)(xian)(xian)接長(chang)明線(xian)(xian)(xian)(xian)，黑線(xian)(xian)(xian)(xian)接開關火線(xian)(xian)(xian)(xian)，藍線(xian)(xian)(xian)(xian)接零(ling)線(xian)(xian)(xian)(xian)。(也有(you)些產品(pin)電(dian)線(xian)(xian)(xian)(xian)用色不一(yi)樣，具體還是要看應急電(dian)源上的接線(xian)(xian)(xian)(xian)標識)。安裝和(he)普(pu)通(tong)筒燈(deng)一(yi)樣，只是多加了個(ge)應急電(dian)源放在天(tian)花板上面。

　　消防應急燈燈，和普通(tong)(tong)吸(xi)頂燈安(an)裝方(fang)式一(yi)樣。接(jie)線(xian)：開(kai)關(guan)(guan)線(xian)接(jie)燈頭，長明(ming)線(xian)接(jie)應急電源線(xian)。零線(xian)共(gong)用。共(gong)4根(gen)線(xian)：一(yi)根(gen)直接(jie)接(jie)火線(xian)(消防狀態及(ji)日常(chang)充電線(xian))，一(yi)根(gen)通(tong)(tong)過開(kai)關(guan)(guan)接(jie)開(kai)關(guan)(guan)線(xian)(正(zheng)常(chang)照(zhao)明(ming))，一(yi)根(gen)接(jie)零，一(yi)根(gen)接(jie)地(di)。

　   消防應急(ji)燈工(gong)作(zuo)原(yuan)理：

　　1、電池充電電路

　　外(wai)電(dian)(dian)(dian)源經Q2，Q6，R8，D10對(dui)電(dian)(dian)(dian)池進行恒(heng)流充電(dian)(dian)(dian)。當有外(wai)電(dian)(dian)(dian)源供電(dian)(dian)(dian)時，充電(dian)(dian)(dian)電(dian)(dian)(dian)流經R8，D10向(xiang)電(dian)(dian)(dian)池充電(dian)(dian)(dian)，且使充電(dian)(dian)(dian)指示燈D12點(dian)亮(liang)。

　　2、燈控制電路

　　由(you)Q3，仍、Q5、Q7和(he)鍵K，G構成，在無市電時，按一下K(開)鍵，Q5飽(bao)和(he)導通，Q5的(de)集電極電流通過(guo)R12使Q7維持導通;D11反(fan)向擊穿工作在穩壓(ya)狀(zhuang)態，Q5的(de)集電極電壓(ya)給Q3，Q4提供(gong)偏置(zhi)使其導通，點亮L1、L2。當按一下G(關)鍵時，Q7截止，撤除了Q5導通條件，燈(deng)關閉(bi)。

　　3、試驗電路

　　當按住試驗按鍵S不放時(shi)，Ql截(jie)止，D7負極電位(wei)變低而正偏導通，使(shi)(shi)Q5導通滿(man)足點燈(deng)條件(jian)，使(shi)(shi)L1、L2點亮。松開S鍵燈(deng)隨(sui)即熄滅。試驗電路(lu)的作用(yong)是測試點燈(deng)電路(lu)是否正常(chang)。

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