電筆怎么確認火線零線和地線
1、判斷火線與零線
用電筆的螺絲刀的一頭接觸電線的一端,大拇指按住頂端,燈亮則是火線,不亮的是零線。可以使用(yong)非接(jie)觸器驗電筆來判斷是火線還是火線,操作方法:
(1)電(dian)筆(bi)靠近(jin)有電(dian)壓的物(wu)體,電(dian)筆(bi)會發(fa)出蜂(feng)鳴聲,則為(wei)火線,該電(dian)筆(bi)可以測90V~1000V的交流電(dian)壓。
(2)當靠近沒有電(dian)壓的零線,此(ci)時(shi)電(dian)筆不會有任(ren)何聲音,證明此(ci)處為零線。
2、電筆測火線零線
大指母與中(zhong)指執(zhi)電筆,食指按住筆帽或筆掛,不要(yao)接觸頭部金(jin)屬筆頭,以(yi)防(fang)觸電。
用電筆(bi)尖頭分別接觸電線(xian)(xian)(xian),當電筆(bi)內部的感(gan)應燈發光時,則這條線(xian)(xian)(xian)為(wei)火線(xian)(xian)(xian),否則為(wei)零(ling)線(xian)(xian)(xian)或(huo)地線(xian)(xian)(xian)。
帶(dai)(dai)電(dian)的(de)不一定就是火線(xian)(xian),在有故(gu)障(zhang)的(de)情況下,零(ling)線(xian)(xian)或地線(xian)(xian)均可能帶(dai)(dai)電(dian),火線(xian)(xian)反而不帶(dai)(dai)電(dian)。
3、萬用表檢測火線與零線
此外,還可(ke)以用萬(wan)用表來判斷(duan)火(huo)線(xian)(xian)與零線(xian)(xian),萬(wan)用表分辨零線(xian)(xian)或火(huo)線(xian)(xian)的方法:
(1)萬(wan)用(yong)表選(xuan)擇(ze)交流電壓檔750V,黑表筆COM插(cha)孔(kong)(kong),紅(hong)表筆電壓,電阻插(cha)孔(kong)(kong)。
(2)黑表(biao)筆懸空,紅表(biao)筆去測,注意觀察讀數(shu),數(shu)字大的是火線,數(shu)值(zhi)小(xiao)的是零(ling)(ling)線。萬用表(biao)區分零(ling)(ling)線時(shi),數(shu)值(zhi)可忽略不計,數(shu)值(zhi)大者(zhe)為火線,數(shu)值(zhi)小(xiao)者(zhe)為零(ling)(ling)線。
在遇到此類問題時,一定要求助于專業電工,以確保人身設施安全,禁止自行測電。
二、電筆測零線和火線的方法
1、雖然(ran)三(san)根(gen)線(xian)(xian)顏色一樣,當時沒有做標記(ji),但是可以(yi)輕松的判斷火線(xian)(xian)。去電源開(kai)關那里合閘(zha),然(ran)后返(fan)回來用電筆測(ce)量三(san)根(gen)線(xian)(xian),其(qi)中一根(gen)線(xian)(xian)肯定會使電筆發光,此根(gen)線(xian)(xian)為火線(xian)(xian)。
2、區分完了(le)火(huo)線(xian)(xian)(xian)(xian)以后,就剩零線(xian)(xian)(xian)(xian)和(he)地線(xian)(xian)(xian)(xian)了(le)。區分零線(xian)(xian)(xian)(xian)和(he)地線(xian)(xian)(xian)(xian),我(wo)們需要借助點家(jia)中常用的電(dian)(dian)器,手機充電(dian)(dian)器也(ye)(ye)行(xing),臺燈(deng)也(ye)(ye)行(xing),燈(deng)泡(pao)也(ye)(ye)行(xing),電(dian)(dian)飯(fan)煲也(ye)(ye)行(xing),利用燈(deng)泡(pao)舉例來(lai)測試零線(xian)(xian)(xian)(xian)和(he)地線(xian)(xian)(xian)(xian);如(ru)果燈(deng)泡(pao)亮就是(shi)零線(xian)(xian)(xian)(xian),如(ru)果燈(deng)泡(pao)不亮就是(shi)地線(xian)(xian)(xian)(xian),這樣就確認(ren)了(le)火(huo)線(xian)(xian)(xian)(xian)和(he)零線(xian)(xian)(xian)(xian)了(le)。