在2類醫用(yong)(yong)場所內(nei)，用(yong)(yong)于(yu)(yu)維持生命(ming)、手術(shu)和其他(ta)位于(yu)(yu)“患者(zhe)區域”內(nei)的醫用(yong)(yong)電(dian)(dian)氣設備和系統(tong)的供(gong)電(dian)(dian)回(hui)路(lu)，均應采用(yong)(yong)醫用(yong)(yong)IT系統(tong)。至少應設置一回(hui)獨立的醫用(yong)(yong)IT系統(tong)。醫用(yong)(yong)IT系統(tong)應配(pei)置一個交流內(nei)阻抗不(bu)少于(yu)(yu)100Ω的絕(jue)(jue)緣(yuan)監(jian)談饑測(ce)器并(bing)滿足(zu)下列要(yao)求：測(ce)試(shi)電(dian)(dian)壓不(bu)應大于(yu)(yu)直流95V；注(zhu)入電(dian)(dian)流的峰值不(bu)應大于(yu)(yu)1mA；遲在絕(jue)(jue)緣(yuan)電(dian)(dian)阻降至50kΩ，時，應發出信號，并(bing)應配(pei)置試(shi)驗此功能的器具。

IT系(xi)(xi)統(tong)：IT系(xi)(xi)統(tong)的(de)(de)電(dian)(dian)源不(bu)(bu)接(jie)(jie)地(di)(di)或(huo)通(tong)(tong)過阻(zu)抗接(jie)(jie)地(di)(di)，電(dian)(dian)氣設(she)備外(wai)露(lu)可導電(dian)(dian)部分可直(zhi)接(jie)(jie)接(jie)(jie)地(di)(di)或(huo)通(tong)(tong)過保護(hu)線接(jie)(jie)到電(dian)(dian)源的(de)(de)接(jie)(jie)地(di)(di)體(ti)上，這也是保護(hu)接(jie)(jie)地(di)(di)。由于該系(xi)(xi)統(tong)出現(xian)次(ci)故障(zhang)時故障(zhang)電(dian)(dian)流小，電(dian)(dian)氣設(she)備金屬外(wai)殼不(bu)(bu)會產生危(wei)險性的(de)(de)接(jie)(jie)觸(chu)電(dian)(dian)壓，因(yin)此可以不(bu)(bu)切斷電(dian)(dian)源，使電(dian)(dian)氣設(she)備繼(ji)續(xu)運行，并可通(tong)(tong)過報警裝置及檢查消(xiao)除故障(zhang)。IT系(xi)(xi)統(tong)，即中性點不(bu)(bu)接(jie)(jie)地(di)(di)系(xi)(xi)統(tong)

IT系(xi)(xi)(xi)統(tong)作(zuo)(zuo)用(yong)：降低出(chu)點電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)和電(dian)(dian)(dian)(dian)(dian)(dian)網對地(di)(di)(di)(di)漏電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)（有效控制對心臟的(de)(de)(de)(de)(de)直(zhi)接(jie)(jie)(jie)(jie)漏電(dian)(dian)(dian)(dian)(dian)(dian)），故人身觸電(dian)(dian)(dian)(dian)(dian)(dian)危險被(bei)降到低程度(du)。可(ke)以防止接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)系(xi)(xi)(xi)統(tong)內漏電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)竄入某些與(yu)患(huan)者連(lian)接(jie)(jie)(jie)(jie)的(de)(de)(de)(de)(de)醫用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)設備的(de)(de)(de)(de)(de)對地(di)(di)(di)(di)回路(lu)，從而避免漏電(dian)(dian)(dian)(dian)(dian)(dian)對患(huan)者安全所構成(cheng)的(de)(de)(de)(de)(de)威脅(xie)。該(gai)系(xi)(xi)(xi)統(tong)還可(ke)以避免漏電(dian)(dian)(dian)(dian)(dian)(dian)導(dao)致系(xi)(xi)(xi)統(tong)短路(lu)器(qi)或熔斷器(qi)動作(zuo)(zuo)，保證(zheng)用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)持續性和可(ke)靠性。醫用(yong)IT供電(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)由一(yi)(yi)臺隔(ge)離(li)變壓(ya)器(qi)，it醫用(yong)隔(ge)離(li)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)系(xi)(xi)(xi)統(tong)，一(yi)(yi)臺絕緣電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)，變壓(ya)器(qi)溫度(du)與(yu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)負荷監測設備和一(yi)(yi)臺安裝(zhuang)(zhuang)于手(shou)術(shu)室或臨(lin)近(jin)的(de)(de)(de)(de)(de)護士間的(de)(de)(de)(de)(de)操作(zuo)(zuo)與(yu)報警終端(duan)(duan)組成(cheng)。IT系(xi)(xi)(xi)統(tong)是區(qu)分(fen)(fen)了(le)三類(lei)不同的(de)(de)(de)(de)(de)接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)系(xi)(xi)(xi)統(tong) 字母(mu)(mu)表示(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)端(duan)(duan)與(yu)地(di)(di)(di)(di)的(de)(de)(de)(de)(de)關系(xi)(xi)(xi)：T表示(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)端(duan)(duan)有一(yi)(yi)點直(zhi)接(jie)(jie)(jie)(jie)接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)；I表示(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)端(duan)(duan)所有帶電(dian)(dian)(dian)(dian)(dian)(dian)部分(fen)(fen)不接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)或有一(yi)(yi)點通過阻(zu)抗接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)。第(di)二個字母(mu)(mu)表示(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)氣裝(zhuang)(zhuang)置(zhi)的(de)(de)(de)(de)(de)外(wai)露可(ke)導(dao)電(dian)(dian)(dian)(dian)(dian)(dian)部分(fen)(fen)與(yu)地(di)(di)(di)(di)的(de)(de)(de)(de)(de)關系(xi)(xi)(xi)：T表示(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)氣裝(zhuang)(zhuang)置(zhi)的(de)(de)(de)(de)(de)外(wai)露可(ke)導(dao)電(dian)(dian)(dian)(dian)(dian)(dian)部分(fen)(fen)直(zhi)接(jie)(jie)(jie)(jie)接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)，此(ci)接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)點在電(dian)(dian)(dian)(dian)(dian)(dian)氣上獨立(li)于電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)端(duan)(duan)的(de)(de)(de)(de)(de)接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)點；表示(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)氣裝(zhuang)(zhuang)置(zhi)的(de)(de)(de)(de)(de)外(wai)露可(ke)導(dao)電(dian)(dian)(dian)(dian)(dian)(dian)部分(fen)(fen)與(yu)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)端(duan)(duan)接(jie)(jie)(jie)(jie)地(di)(di)(di)(di)有直(zhi)接(jie)(jie)(jie)(jie)電(dian)(dian)(dian)(dian)(dian)(dian)氣連(lian)接(jie)(jie)(jie)(jie)。