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。可以使用非(fei)接觸器驗電筆來判(pan)斷(duan)是火(huo)線還是火(huo)線,操(cao)作方(fang)法:
(1)電筆靠近有電壓的物體,電筆會發出蜂鳴聲,則為火線,該電筆可以測90V~1000V的交流電壓。
(2)當靠近(jin)沒有電壓的零線,此(ci)時電筆不會(hui)有任(ren)何聲音,證明此(ci)處為(wei)零線。
2、電筆測火線零線
大指母與(yu)中指執電(dian)筆(bi)(bi),食指按住筆(bi)(bi)帽或(huo)筆(bi)(bi)掛(gua),不要接觸頭部金(jin)屬(shu)筆(bi)(bi)頭,以防(fang)觸電(dian)。
用電(dian)筆(bi)尖(jian)頭分別接(jie)觸(chu)電(dian)線(xian)(xian)(xian),當電(dian)筆(bi)內(nei)部的感應燈發光時,則(ze)這條線(xian)(xian)(xian)為火(huo)線(xian)(xian)(xian),否則(ze)為零線(xian)(xian)(xian)或地(di)線(xian)(xian)(xian)。
帶電(dian)的(de)(de)不一定就(jiu)是火(huo)線(xian),在有(you)故障(zhang)的(de)(de)情況(kuang)下,零線(xian)或地線(xian)均可能帶電(dian),火(huo)線(xian)反而不帶電(dian)。
3、萬用表檢測火線與零線
此外,還可(ke)以(yi)用(yong)萬用(yong)表來判(pan)斷火(huo)線與零線,萬用(yong)表分辨零線或火(huo)線的方法:
(1)萬用表(biao)選(xuan)擇交(jiao)流電壓檔750V,黑(hei)表(biao)筆COM插(cha)孔,紅表(biao)筆電壓,電阻插(cha)孔。
(2)黑表筆(bi)懸空,紅表筆(bi)去測,注(zhu)意觀(guan)察(cha)讀數,數字(zi)大(da)(da)的是火(huo)線(xian),數值(zhi)小的是零線(xian)。萬(wan)用表區分零線(xian)時,數值(zhi)可(ke)忽略不計(ji),數值(zhi)大(da)(da)者為火(huo)線(xian),數值(zhi)小者為零線(xian)。
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(sui)然三根(gen)線(xian)顏色(se)一樣(yang),當時沒有(you)做(zuo)標(biao)記,但是可以輕松(song)的判斷火(huo)線(xian)。去電(dian)源開關(guan)那里合閘,然后返(fan)回來用電(dian)筆測量三根(gen)線(xian),其中一根(gen)線(xian)肯定會(hui)使電(dian)筆發光,此(ci)根(gen)線(xian)為(wei)火(huo)線(xian)。
2、區分(fen)完(wan)了火線(xian)(xian)(xian)(xian)(xian)(xian)以后,就(jiu)(jiu)剩零(ling)線(xian)(xian)(xian)(xian)(xian)(xian)和(he)地(di)(di)線(xian)(xian)(xian)(xian)(xian)(xian)了。區分(fen)零(ling)線(xian)(xian)(xian)(xian)(xian)(xian)和(he)地(di)(di)線(xian)(xian)(xian)(xian)(xian)(xian),我們需要借(jie)助點(dian)家中常用的電(dian)器,手機充電(dian)器也行,臺燈也行,燈泡(pao)也行,電(dian)飯煲也行,利用燈泡(pao)舉例來測試零(ling)線(xian)(xian)(xian)(xian)(xian)(xian)和(he)地(di)(di)線(xian)(xian)(xian)(xian)(xian)(xian);如果燈泡(pao)亮就(jiu)(jiu)是零(ling)線(xian)(xian)(xian)(xian)(xian)(xian),如果燈泡(pao)不亮就(jiu)(jiu)是地(di)(di)線(xian)(xian)(xian)(xian)(xian)(xian),這樣就(jiu)(jiu)確認了火線(xian)(xian)(xian)(xian)(xian)(xian)和(he)零(ling)線(xian)(xian)(xian)(xian)(xian)(xian)了。