最簡單的方法就是用萬用表測量地線的電流，如果地線存在電流，那麼就是相線接地了。如果檢測地線沒有明顯的電流值，在确認無電器設備工作的情況下檢測零線有沒有電流，如果有電流那麼就是相線相間短路或者相線對零線短路。

The simplest way is to measure the current of the ground with a multimeter, and if there is a current in the ground, then the phase line is grounded. If there is no obvious current value in the detection ground, there is no current in the detection of the zero line in the case of confirming that there is no electrical equipment working, and if there is a current, then it is a phase-to-phase short circuit or a phase-to-neutral short circuit.這種測量方式是最為直接的，如果已經斷電，無法檢測電流的情況下，可以考慮用萬用表的阻值檔去檢查零線和火線之間的電阻、零線和地線之間的電阻、火線和零線之間的電阻，當然如果是380V的供電電源你還需要檢查火線之間的相間電阻。

This measurement method is the most direct, if the power has been cut off, can not detect the current, you can consider using the multimeter resistance file to check the resistance between the zero line and the fire wire, the resistance between the zero line and the ground wire, the resistance between the fire line and the zero line, of course, if it is a 380V power supply you also need to check the phase resistance between the fire wire.當然不同的供電方式，檢查的出來的結論是不一樣的，在TT供電系統中零線在入戶前需要單獨進行接地，電氣設備的金屬外殼一樣需要單獨的接地，這個時候測量零線和地線之間的電阻阻值正常情況下是比較低的，也就是說零線和地線與火線短路你檢查的結果是零線與火線、地線與火線之間的電阻都比較低，可以将零線入戶時的接地取掉再進行檢查。

Of course, different power supply methods, the conclusion of the inspection is not the same, in the TT power supply system the zero line in the household before entering the home needs to be grounded separately, the metal shell of the electrical equipment also needs to be grounded separately, this time the resistance between the measurement of the zero line and the ground wire is normally relatively low, that is to say, the zero line and the ground wire and the fire wire short circuit You check the result is that the resistance between the zero line and the fire line, the ground wire and the fire wire are relatively low, and the ground between the zero line when entering the house is removed and then checked.在TN-S供電系統中是三相五線制，有三根火線、地線、零線，這個時候去檢查零線和地線之間會存在一定的電阻阻值，同樣的方法檢查的時候需要去切掉地線或零線的進行，再分别用萬用表去檢查零線與火線、地線與火線、火線相間之間的阻值，來判斷是哪個地方短路。

In the TN-S power supply system is a three-phase five-wire system, there are three fire wires, ground wires, zero lines, this time to check the zero line and ground wire between the existence of a certain resistance value, the same method of inspection needs to cut off the ground line or zero line, and then use the multimeter to check the resistance between the zero line and the fire line, the ground line and the fire line, the fire line between the resistance, to determine which place is short circuit.

如果是TN-C系統就比較簡單了，零線和地線是一根線PEN，隻需要去檢查火線相間、PEN線與火線之間的電阻阻值即可。

If it is a TN-C system, it is relatively simple, the zero line and the ground wire are a line PEN, you only need to check the resistance between the fire wire phase, the PEN line and the fire wire.另外需要說明下：檢查短路最有效的工具并不是萬用表，應該使用對應電壓等級的搖表來檢查。

In addition, it should be noted that the most effective tool for checking short circuits is not a multimeter, and a rocker meter corresponding to the voltage level should be used to check.

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