T系(xi)統(tong)(tong)與應急(ji)電(dian)(dian)源的(de)(de)(de)區(qu)別;應急(ji)電(dian)(dian)源（UPS/EPS）是(shi)在(zai)正(zheng)常供電(dian)(dian)線路電(dian)(dian)力中斷時(shi)的(de)(de)(de)后(hou)備應急(ji)電(dian)(dian)源，不能防(fang)范接(jie)地故(gu)(gu)障。在(zai)普(pu)通(tong)的(de)(de)(de)接(jie)地系(xi)統(tong)(tong)（TN-S系(xi)統(tong)(tong)）內負載端出現(xian)對地故(gu)(gu)障時(shi)，不管(guan)該系(xi)統(tong)(tong)使(shi)用(yong)的(de)(de)(de)是(shi)應急(ji)電(dian)(dian)源還(huan)是(shi)普(pu)通(tong)的(de)(de)(de)供電(dian)(dian)線路，it系(xi)統(tong)(tong)運維，都不能限制(zhi)故(gu)(gu)障電(dian)(dian)流的(de)(de)(de)增大，只有采(cai)用(yong)IT系(xi)統(tong)(tong)后(hou)才能大限度地限制(zhi)故(gu)(gu)障電(dian)(dian)流，達到接(jie)地保(bao)護的(de)(de)(de)目(mu)的(de)(de)(de)。

隨著醫(yi)(yi)用(yong)(yong)(yong)(yong)技術(shu)(shu)的(de)(de)(de)快(kuai)速發(fa)展(zhan)，現代醫(yi)(yi)院(yuan)中(zhong)(zhong)的(de)(de)(de)各(ge)種醫(yi)(yi)用(yong)(yong)(yong)(yong)電(dian)氣設(she)備(bei)越(yue)來越(yue)多，其中(zhong)(zhong)包括大(da)量會(hui)觸及(ji)患(huan)者(zhe)(zhe)身體(ti)的(de)(de)(de)醫(yi)(yi)用(yong)(yong)(yong)(yong)救護設(she)備(bei)，據(ju)有(you)關(guan)研(yan)究數據(ju)，只要有(you) 10μA的(de)(de)(de)電(dian)流直(zhi)接流過(guo)(guo)患(huan)者(zhe)(zhe)心(xin)，就(jiu)會(hui)造成(cheng)人(ren)體(ti)損傷，因此(ci)，如何保(bao)(bao)護醫(yi)(yi)院(yuan)的(de)(de)(de)患(huan)者(zhe)(zhe)以及(ji)醫(yi)(yi)護人(ren)員(yuan)不受(shou)漏電(dian)事(shi)故的(de)(de)(de)傷害(hai)就(jiu)變得非常(chang)重要，尤其是在(zai)ICU 病房(fang)中(zhong)(zhong)，患(huan)者(zhe)(zhe)多為危重患(huan)者(zhe)(zhe)，身體(ti)比(bi)較虛弱，如發(fa)生(sheng)設(she)備(bei)漏電(dian)故障(zhang)，就(jiu)更容易(yi)發(fa)生(sheng)電(dian)氣事(shi)故，導(dao)致患(huan)者(zhe)(zhe)發(fa)生(sheng)觸電(dian)傷害(hai)，甚至威脅到患(huan)者(zhe)(zhe)的(de)(de)(de)生(sheng)命。隨著人(ren)們(men)對(dui)(dui)醫(yi)(yi)院(yuan) ICU、CCU、手術(shu)(shu)室等特(te)殊(shu)醫(yi)(yi)用(yong)(yong)(yong)(yong)場(chang)所(suo)的(de)(de)(de)環境要求(qiu)越(yue)來越(yue)高(gao)，過(guo)(guo)去的(de)(de)(de)一些建筑設(she)計已(yi)不能滿足人(ren)們(men)對(dui)(dui)人(ren)身安全(quan)保(bao)(bao)障(zhang)的(de)(de)(de)要求(qiu)。目前(qian)，國內外對(dui)(dui)特(te)殊(shu)的(de)(de)(de)醫(yi)(yi)用(yong)(yong)(yong)(yong)場(chang)所(suo)，如 ICU、CCU、手術(shu)(shu)室等場(chang)所(suo)，都(dou)規定了醫(yi)(yi)用(yong)(yong)(yong)(yong)設(she)備(bei)電(dian)源使(shi)用(yong)(yong)(yong)(yong)醫(yi)(yi)用(yong)(yong)(yong)(yong)隔離(li)(li)電(dian)源系(xi)統(tong)（IEC標準名稱為醫(yi)(yi)用(yong)(yong)(yong)(yong)IT系(xi)統(tong)，醫(yi)(yi)用(yong)(yong)(yong)(yong)隔離(li)(li)電(dian)源系(xi)統(tong)是業(ye)內更常(chang)用(yong)(yong)(yong)(yong)的(de)(de)(de)叫法），以保(bao)(bao)證患(huan)者(zhe)(zhe)及(ji)醫(yi)(yi)護人(ren)員(yuan)的(de)(de)(de)安全(quan)。

有效保(bao)障醫(yi)用設(she)備(bei)的正常運行。防止其(qi)他供電(dian)(dian)回(hui)路中的漏電(dian)(dian)流通過接(jie)地(di)(di)線竄入手(shou)術(shu)室、ICU、CCU等特殊場所(suo)的醫(yi)用設(she)備(bei)上對患者(zhe)的安全構成威脅(xie)。醫(yi)用隔(ge)離電(dian)(dian)源減(jian)少了(le)(le)各(ge)種醫(yi)用設(she)備(bei)可(ke)能(neng)(neng)(neng)出現的對地(di)(di)故(gu)(gu)障。一旦(dan)隔(ge)離電(dian)(dian)源上所(suo)接(jie)的各(ge)種醫(yi)用設(she)備(bei)出現對地(di)(di)故(gu)(gu)障，因其(qi)對地(di)(di)不能(neng)(neng)(neng)構成回(hui)路，所(suo)以只(zhi)能(neng)(neng)(neng)產生一個很小的容性漏電(dian)(dian)流，極(ji)大(da)地(di)(di)保(bao)護了(le)(le)患者(zhe)免遭漏電(dian)(dian)流的傷害。