How To Connect The Main Distribution Box To The Distribution Box

The distribution box is a low-voltage distribution device that assembles switchgear, measuring instruments, protective electrical appliances and auxiliary equipment in a closed or semi-enclosed metal cabinet or on a screen according to the requirements of electrical wiring. During normal operation, the circuit can be connected or segmented with the help of manual or automatic switches.

In case of fault or abnormal operation, the circuit can be cut off or alarmed with the help of protective electrical appliances. The measuring instrument can display various parameters in operation, and can also adjust certain electrical parameters, and give prompts or signals for deviations from normal working conditions. It is often used in various power generation, distribution and substations.

1. From the distribution switch of the total High And Low Voltage Distribution Cabinets, the yellow, green and red (A, B, C) three-phase lines are respectively drawn out, the light blue working neutral line is drawn out from the working neutral terminal, and the yellow-green two-color PE protective neutral line is drawn out from the PE terminal.

Note: The main distribution box door and the box body must be reliably connected with braided soft copper wire for protective zero connection, and the five lines are set up at a safe distance.

2. The yellow, green and red three-phase wires of the line are connected to the main isolating switch of the secondary distribution box, and the light blue N line is connected to the N end of the leakage protector, and then connected to the working neutral line terminal board after passing through the leakage protector.

3. The yellow and green two-color PE line is connected to the protection zero terminal board PE board.

4. Lead the three-phase wires from the main isolating switch of the secondary distribution box to the leakage protector.

5. Lead the phase line from the leakage protector terminal to the branch isolating switch.

Note: The PE line cannot enter the leakage protector, because the leakage protector at the end of the line will cause the previous leakage protector to trip and cause a large-scale power outage.

6. The yellow, green and red three-phase wires are respectively led from the branch isolating switch of the distribution box, the light blue working neutral line is led from the N board terminal, and the yellow and green two-color protection neutral line is led from the PE board terminal.

Note: The door and the box body of the distribution box must be reliably connected with braided soft copper wire for protection zero connection.