1.總等電(dian)位聯(lian)(lian)結(jie)的作用，在于降(jiang)低建(jian)(jian)筑(zhu)物(wu)內間接接觸(chu)電(dian)擊的接觸(chu)電(dian)壓(ya)和不同金(jin)屬部件間的電(dian)位差，并清除自建(jian)(jian)筑(zhu)物(wu)外經電(dian)氣線路各種金(jin)屬管(guan)道(dao)引(yin)入的危(wei)險故障電(dian)壓(ya)的危(wei)害，建(jian)(jian)筑(zhu)物(wu)每一(yi)電(dian)源進線都應做總等電(dian)位聯(lian)(lian)結(jie)，各個聯(lian)(lian)接端(duan)子板應互扣相通。

2.輔助(zhu)等(deng)(deng)電(dian)(dian)位聯(lian)結的(de)作用：將兩導電(dian)(dian)部分用導線直接(jie)作等(deng)(deng)電(dian)(dian)位聯(lian)結，使故障接(jie)觸電(dian)(dian)壓降至接(jie)觸電(dian)(dian)壓限值以(yi)下。電(dian)(dian)源網絡阻抗(kang)過火，使自(zi)動(dong)切斷(duan)電(dian)(dian)源時(shi)間過長，不能滿(man)足防電(dian)(dian)擊(ji)要(yao)求(qiu)時(shi)；為滿(man)足浴室、游泳池、醫院手術(shu)室等(deng)(deng)場所對防電(dian)(dian)擊(ji)的(de)特殊要(yao)求(qiu)時(shi)；自(zi)TN系(xi)統同(tong)一配電(dian)(dian)器(qi)供給固定式和(he)移動(dong)式兩種(zhong)電(dian)(dian)氣設備，而固定式設備保(bao)護電(dian)(dian)器(qi)切斷(duan)電(dian)(dian)源時(shi)間不能滿(man)足移動(dong)式防電(dian)(dian)擊(ji)要(yao)求(qiu)時(shi)。

3.局部(bu)等(deng)電(dian)位(wei)(wei)：當需(xu)在一局部(bu)場所范圍內做各個(ge)輔助等(deng)電(dian)位(wei)(wei)聯(lian)(lian)貫器(qi)，可通過(guo)局部(bu)等(deng)電(dian)位(wei)(wei)聯(lian)(lian)結(jie)端子板將下列部(bu)分互相(xiang)聯(lian)(lian)通，以簡便地實現局部(bu)范圍內的多個(ge)輔助等(deng)電(dian)位(wei)(wei)聯(lian)(lian)結(jie)，被稱作局部(bu)等(deng)電(dian)位(wei)(wei)聯(lian)(lian)結(jie)。