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(qi)設備(bei)構(gou)件的額定(ding)值工作中(zhong)電流(liu)某(mou)些應超過2倍需(xu)要的負載電流(liu)；除此之外，在設計方案、抉擇(ze)電氣(qi)設備(bei)構(gou)件時，家(jia)用(yong)(yong)聚碳(tan)酸(suan)酯表箱也要充分考(kao)慮當今用(yong)(yong)電量提升(sheng)的概率，為當今需(xu)要留(liu)出(chu)容量.

總(zong)負載電(dian)流即是(shi)(shi)各(ge)分(fen)支(zhi)電(dian)流之跟；曉得了(le)分(fen)支(zhi)電(dian)流跟總(zong)電(dian)流，就很有可能抉擇分(fen)支(zhi)空(kong)氣開(kai)關(guan)及電(dian)閘開(kai)關(guan)空(kong)氣開(kai)關(guan)、總(zong)熔斷(duan)絲，總(zong)電(dian)度表(biao)及其各(ge)環路電(dian)纜線(xian)的(de)規格型(xing)號，或(huo)是(shi)(shi)檢(jian)算已設(she)計方案的(de)這種電(dian)氣設(she)備構件的(de)規格型(xing)號是(shi)(shi)不是(shi)(shi)符合(he)商業保險要求；

②客觀(guan)負(fu)載(zai)，如(ru)熒光(guang)(guang)燈(deng)管，電視，全自動洗(xi)衣機，等盤(pan)算稍微(wei)繁雜，要(yao)考慮到耗費輸(shu)出功率，實際(ji)盤(pan)算也要(yao)考慮到功率因素(su)等，為(wei)以便估計(ji)，小編(bian)得出一個(ge)勤儉的盤(pan)算方式(shi)，即某些客觀(guan)負(fu)載(zai)，根據其標明(ming)負(fu)載(zai)盤(pan)算出去的輸(shu)出功率在翻(fan)一倍就可以，比如(ru)標明(ming)20W的日日光(guang)(guang)燈(deng)的分支電流(liu)I=20W/220v=0.09A，翻(fan)番(fan)為(wei)0.09A2=0.18A（比恰當盤(pan)算值0.1，多0.03A）

①純電(dian)阻(zu)性負載(zai)，如電(dian)燈泡，電(dian)熱(re)水(shui)器(qi)等用標明輸出功(gong)率(lv)立即(ji)除于工作電(dian)壓即(ji)得(de)，公式計算(suan)I=輸出功(gong)率(lv)/220v；比如20w的電(dian)燈泡，分支電(dian)流I=20W/220=0.09A。電(dian)扇(shan)、熨斗、電(dian)褥子、家用熱(re)水(shui)器(qi)、電(dian)暖(nuan)氣、電(dian)飯煲、電(dian)鍋、吸塵機(ji)、中央(yang)空(kong)調等為感性負載(zai)負載(zai)。

空(kong)(kong)(kong)(kong)氣(qi)開(kai)(kai)關(guan)(guan)(guan)在家(jia)中(zhong)(zhong)供電(dian)(dian)(dian)系(xi)統中(zhong)(zhong)作總開(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)維護(hu)(hu)(hu)保(bao)(bao)養(yang)(yang)電(dian)(dian)(dian)源(yuan)開(kai)(kai)關(guan)(guan)(guan)或(huo)分支線維護(hu)(hu)(hu)保(bao)(bao)養(yang)(yang)電(dian)(dian)(dian)源(yuan)開(kai)(kai)關(guan)(guan)(guan)用(yong)。當(dang)住(zhu)房(fang)路(lu)(lu)線或(huo)家(jia)庭(ting)裝造成短路(lu)(lu)故(gu)障或(huo)負載時，它(ta)能積(ji)跳電(dian)(dian)(dian)，斷開(kai)(kai)開(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)，進而合理的(de)維護(hu)(hu)(hu)保(bao)(bao)養(yang)(yang)這種機(ji)器設備(bei)免遭(zao)毀壞或(huo)防止事情擴張；家(jia)中(zhong)(zhong)某些用(yong)二(er)（即2P）空(kong)(kong)(kong)(kong)氣(qi)開(kai)(kai)關(guan)(guan)(guan)作總開(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)維護(hu)(hu)(hu)保(bao)(bao)養(yang)(yang)，用(yong)單級（1P）作分支維護(hu)(hu)(hu)保(bao)(bao)養(yang)(yang)；空(kong)(kong)(kong)(kong)氣(qi)開(kai)(kai)關(guan)(guan)(guan)的(de)額定(ding)值電(dian)(dian)(dian)流(liu)倘若抉擇的(de)偏小，則空(kong)(kong)(kong)(kong)氣(qi)開(kai)(kai)關(guan)(guan)(guan)易經(jing)常跳電(dian)(dian)(dian)，造成多余的(de)斷電(dian)(dian)(dian)，如抉擇過大，則達不(bu)上(shang)預估的(de)維護(hu)(hu)(hu)保(bao)(bao)養(yang)(yang)不(bu)良影(ying)響，因而家(jia)居(ju)裝修空(kong)(kong)(kong)(kong)氣(qi)開(kai)(kai)關(guan)(guan)(guan)，恰當(dang)抉擇短路(lu)(lu)容量電(dian)(dian)(dian)流(liu)尺寸很重要。某些中(zhong)(zhong)小型空(kong)(kong)(kong)(kong)氣(qi)開(kai)(kai)關(guan)(guan)(guan)規格型號關(guan)(guan)(guan)鍵以(yi)額定(ding)值電(dian)(dian)(dian)流(liu)區6A，10A，16A，20A，2，32A，40A，50A，63A，80A，100A等(deng)；那麼(ma)某些家(jia)中(zhong)(zhong)怎樣抉擇或(huo)檢算總負載電(dian)(dian)(dian)流(liu)的(de)總價值呢？

聚碳酸酯表箱空氣開關的尺寸抉擇，某些是(shi)按(an)用電(dian)流的1.2倍(bei)抉擇就可以。例如，380V工(gong)作電(dian)壓時，某輸出(chu)功率(lv)為5000W，盤算電(dian)流為23A上下，則23A