盤算各分支電流的值為了更好地保證 商業保險牢固，聚碳酸酯表箱電氣設備(bei)構件的(de)額定值工(gong)作中(zhong)電流某些應超(chao)過(guo)2倍需(xu)要的(de)負載電流；除此之外，在設計方案、抉擇電氣設備(bei)構件時，家用聚碳(tan)酸酯表(biao)箱也要充(chong)分考慮當今(jin)(jin)用電量提(ti)升的(de)概率，為(wei)當今(jin)(jin)需(xu)要留(liu)出容量.

總負載電(dian)(dian)流(liu)即(ji)是各(ge)分(fen)支(zhi)電(dian)(dian)流(liu)之跟；曉(xiao)得了分(fen)支(zhi)電(dian)(dian)流(liu)跟總電(dian)(dian)流(liu)，就(jiu)很有可(ke)能抉擇(ze)分(fen)支(zhi)空氣開關(guan)及電(dian)(dian)閘開關(guan)空氣開關(guan)、總熔斷絲，總電(dian)(dian)度表(biao)及其各(ge)環路電(dian)(dian)纜線的(de)規格型(xing)號，或(huo)是檢算已(yi)設(she)計方案的(de)這(zhe)種電(dian)(dian)氣設(she)備構件的(de)規格型(xing)號是不是符合商業(ye)保(bao)險要求；

②客(ke)觀(guan)負(fu)載，如(ru)熒(ying)光燈管(guan)，電視，全自動洗衣機，等盤(pan)算(suan)稍微繁雜，要考慮到耗費輸出功率，實際盤(pan)算(suan)也要考慮到功率因(yin)素(su)等，為(wei)以便估計，小編得(de)出一(yi)個勤儉的盤(pan)算(suan)方式(shi)，即某些客(ke)觀(guan)負(fu)載，根據其(qi)標明(ming)負(fu)載盤(pan)算(suan)出去的輸出功率在翻(fan)一(yi)倍就可以，比如(ru)標明(ming)20W的日(ri)日(ri)光燈的分(fen)支電流I=20W/220v=0.09A，翻(fan)番為(wei)0.09A2=0.18A（比恰當(dang)盤(pan)算(suan)值(zhi)0.1，多0.03A）

①純(chun)電(dian)(dian)阻(zu)性負(fu)載，如(ru)電(dian)(dian)燈泡(pao)，電(dian)(dian)熱(re)水器(qi)等用標明輸出功(gong)(gong)率立即除于工作電(dian)(dian)壓(ya)即得，公式計(ji)算I=輸出功(gong)(gong)率/220v；比如(ru)20w的電(dian)(dian)燈泡(pao)，分支電(dian)(dian)流I=20W/220=0.09A。電(dian)(dian)扇、熨斗、電(dian)(dian)褥子、家用熱(re)水器(qi)、電(dian)(dian)暖氣、電(dian)(dian)飯煲、電(dian)(dian)鍋(guo)、吸塵(chen)機(ji)、中央空調等為感性負(fu)載負(fu)載。

空(kong)氣開(kai)關(guan)(guan)在家(jia)中(zhong)供電(dian)(dian)系(xi)統中(zhong)作總開(kai)關(guan)(guan)電(dian)(dian)源(yuan)維(wei)(wei)護(hu)(hu)保(bao)養(yang)(yang)電(dian)(dian)源(yuan)開(kai)關(guan)(guan)或分支線維(wei)(wei)護(hu)(hu)保(bao)養(yang)(yang)電(dian)(dian)源(yuan)開(kai)關(guan)(guan)用(yong)。當住(zhu)房路線或家(jia)庭(ting)裝(zhuang)造(zao)成短路故障或負載(zai)時，它(ta)能(neng)積跳電(dian)(dian)，斷開(kai)開(kai)關(guan)(guan)電(dian)(dian)源(yuan)，進而合理的(de)(de)維(wei)(wei)護(hu)(hu)保(bao)養(yang)(yang)這種機器設備免遭毀(hui)壞或防止事情擴張；家(jia)中(zhong)某些用(yong)二(er)（即2P）空(kong)氣開(kai)關(guan)(guan)作總開(kai)關(guan)(guan)電(dian)(dian)源(yuan)維(wei)(wei)護(hu)(hu)保(bao)養(yang)(yang)，用(yong)單級(ji)（1P）作分支維(wei)(wei)護(hu)(hu)保(bao)養(yang)(yang)；空(kong)氣開(kai)關(guan)(guan)的(de)(de)額定(ding)值(zhi)(zhi)電(dian)(dian)流(liu)(liu)倘(tang)若抉擇的(de)(de)偏小(xiao)，則(ze)空(kong)氣開(kai)關(guan)(guan)易經常跳電(dian)(dian)，造(zao)成多余的(de)(de)斷電(dian)(dian)，如抉擇過大，則(ze)達不上預(yu)估的(de)(de)維(wei)(wei)護(hu)(hu)保(bao)養(yang)(yang)不良影響，因而家(jia)居裝(zhuang)修空(kong)氣開(kai)關(guan)(guan)，恰當抉擇短路容量電(dian)(dian)流(liu)(liu)尺寸很重要。某些中(zhong)小(xiao)型空(kong)氣開(kai)關(guan)(guan)規格型號關(guan)(guan)鍵以額定(ding)值(zhi)(zhi)電(dian)(dian)流(liu)(liu)區(qu)6A，10A，16A，20A，2，32A，40A，50A，63A，80A，100A等；那麼某些家(jia)中(zhong)怎(zen)樣(yang)抉擇或檢(jian)算總負載(zai)電(dian)(dian)流(liu)(liu)的(de)(de)總價(jia)值(zhi)(zhi)呢？

聚碳酸酯表(biao)箱空氣開關的尺(chi)寸抉擇(ze)，某些是(shi)按用電(dian)流(liu)的1.2倍(bei)抉擇(ze)就可以。例(li)如，380V工作電(dian)壓(ya)時，某輸出功率為(wei)5000W，盤算電(dian)流(liu)為(wei)23A上下，則23A