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在世界范圍內(nèi),大部分標(biāo)準(zhǔn)的供電電源類(lèi)型劃分為三種形式.這三種形式符合IEC 60364 國(guó)際標(biāo)準(zhǔn).
IEC 60364 根據(jù)三種不同的接地形式, 分為 TN, TT 和 IT.

下表說(shuō)明了這些代碼的含義:

第一個(gè)字母表示大地和供電電源之間的連接(發(fā)電機(jī)或者變壓器)

T = 和大地直接連接(來(lái)自法語(yǔ): Terre)
I = 不接地. 也可能通過(guò)高阻抗設(shè)備和大地連接

第二個(gè)字母表示大地和用電設(shè)備之間的連接

T = 與大地直接連接. 與電源接地系統(tǒng)無(wú)關(guān)
N = 經(jīng)供電網(wǎng)絡(luò)連接到大地
第三和第四個(gè)字母表示接地導(dǎo)線的位置:

S = 中性點(diǎn)和大地分開(kāi).
C = 中性點(diǎn)和大地合并在一起
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