1.總等電(dian)(dian)位(wei)聯(lian)結(jie)的作用，在于降低建筑物內(nei)間接(jie)接(jie)觸電(dian)(dian)擊的接(jie)觸電(dian)(dian)壓和不同金(jin)屬部(bu)件間的電(dian)(dian)位(wei)差(cha)，并清(qing)除自(zi)建筑物外(wai)經電(dian)(dian)氣線路各種金(jin)屬管道引(yin)入的危(wei)險故障電(dian)(dian)壓的危(wei)害，建筑物每一電(dian)(dian)源進線都(dou)應做總等電(dian)(dian)位(wei)聯(lian)結(jie)，各個(ge)聯(lian)接(jie)端子板(ban)應互扣相通(tong)。

2.輔助等(deng)電(dian)(dian)(dian)(dian)位聯(lian)結(jie)的作(zuo)(zuo)用(yong)：將兩(liang)導電(dian)(dian)(dian)(dian)部分(fen)用(yong)導線直接(jie)(jie)作(zuo)(zuo)等(deng)電(dian)(dian)(dian)(dian)位聯(lian)結(jie)，使(shi)故障接(jie)(jie)觸(chu)電(dian)(dian)(dian)(dian)壓(ya)降至(zhi)接(jie)(jie)觸(chu)電(dian)(dian)(dian)(dian)壓(ya)限(xian)值以下(xia)。電(dian)(dian)(dian)(dian)源(yuan)網絡阻抗過火，使(shi)自動切(qie)斷(duan)電(dian)(dian)(dian)(dian)源(yuan)時(shi)間(jian)過長，不(bu)能滿足(zu)防(fang)電(dian)(dian)(dian)(dian)擊(ji)要(yao)求時(shi)；為(wei)滿足(zu)浴室、游泳池、醫院手術室等(deng)場所對防(fang)電(dian)(dian)(dian)(dian)擊(ji)的特殊要(yao)求時(shi)；自TN系統同(tong)一配電(dian)(dian)(dian)(dian)器(qi)供給(gei)固定(ding)式和移動式兩(liang)種電(dian)(dian)(dian)(dian)氣設(she)備，而(er)固定(ding)式設(she)備保護電(dian)(dian)(dian)(dian)器(qi)切(qie)斷(duan)電(dian)(dian)(dian)(dian)源(yuan)時(shi)間(jian)不(bu)能滿足(zu)移動式防(fang)電(dian)(dian)(dian)(dian)擊(ji)要(yao)求時(shi)。

3.局部(bu)(bu)(bu)(bu)等電(dian)位(wei)：當需(xu)在一(yi)局部(bu)(bu)(bu)(bu)場所范圍(wei)內做各個輔助(zhu)等電(dian)位(wei)聯貫器，可通(tong)(tong)過局部(bu)(bu)(bu)(bu)等電(dian)位(wei)聯結端子板將(jiang)下列部(bu)(bu)(bu)(bu)分互相聯通(tong)(tong)，以簡(jian)便(bian)地(di)實現局部(bu)(bu)(bu)(bu)范圍(wei)內的多個輔助(zhu)等電(dian)位(wei)聯結，被稱作(zuo)局部(bu)(bu)(bu)(bu)等電(dian)位(wei)聯結。