故障或不正常運行時借助保護電器切斷電路或報警。借測量儀表可顯示運行中的各種參數，還可對某些電氣參數進行調整，對偏離正常工作狀態進行提示或發出信號常用于發、配、變電所中。
In case of fault or abnormal operation, cut off the circuit or alarm with the help of protective appliances. The measuring instrument can display various parameters in operation, adjust some electrical parameters, prompt or send signals for deviation from the normal working state, which is often used in power generation, distribution and substation.
1、從總配電箱的分配電開關分別出黃綠、紅（A、B、C）三相線，淡藍色工作零線從工作零接線端引出，黃綠雙色PE保護零線從PE端子引出。（注意：總配電箱門與箱體必須采用編織軟銅線可靠連接保護接零，五線之間架設的距離）；
1. The yellow green and red (a, B, c) three-phase lines are respectively led out from the distribution switch of the main distribution box, the light blue working zero line is led out from the working zero terminal, and the yellow green two-color PE protection zero line is led out from the PE terminal. (Note: the door and box of the main distribution box must be reliably connected with braided soft copper wire to protect the neutral, and the safe distance between the five lines);
2、線路的黃、綠、紅三相線接入到二級分配電箱的總隔離開關上，淡藍色的N線接入到漏電保護器的N端子，通過漏保后接到工作零線子端子板；
2. The yellow, green and red three-phase lines of the line are connected to the main disconnector of the secondary distribution box, the light blue n line is connected to the N terminal of the leakage protector, and connected to the working zero line sub terminal board after passing the leakage protection;
3、黃綠雙色的PE線接入到保護零端子板PE板子；
3. The yellow and green PE line is connected to the PE board of the protection zero terminal board;
4、從二分配電箱的總隔離開關引出三相線到漏電保護器；
4. Lead out the three-phase line from the main disconnector of the second distribution box to the leakage protector;
5、從漏電保護器接線端引出相線到分路隔離開關；（注意：PE線不能進入漏電保護器，因為線路末端漏電保護器動作會使級漏電保護跳閘造成大范圍停電）；
5. Lead out the phase line from the terminal of leakage protector to the shunt disconnector; (Note: PE line cannot enter the leakage protector, because the action of the leakage protector at the end of the line will trip the level leakage protection and cause large-scale power failure);
6、黃、綠、紅三相線分別從分配電箱的分路隔離開關引出，從N板接線端子引出淡藍色的工作零線，從PE板接線端子引出黃綠雙色保護零線；（注意：分配電箱門與箱體間必須采用編織軟銅線可靠連接作保護接零）。
6. The yellow, green and red three-phase lines are respectively led out from the shunt disconnector of the distribution box, the light blue working zero line is led out from the wiring terminal of N board, and the yellow and green two-color protection zero line is led out from the wiring terminal of PE board; (Note: braided soft copper wire must be reliably connected between the distribution box door and the box as protective neutral connection).
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