1. The "grounding bar" (PE) in the power ready board is directly connected to the "grounding bar" or "grounding wire";

2. The metal box itself shall be processed with "box grounding bolt" (with PE identification), which needs to be connected with the grounded PE bar with copper core conductor or special braided flexible wire;

3. The metal threading pipe connected with the box also needs to have reliable electrical connection with the box (simple can be welded with galvanized round steel and flat steel)

4. The parts of electrical components in the box that must be grounded shall also be connected with PE bar:

5. The ground wires in all circuits to be distributed are led out from PE row

6. The shell grounding of the ready board is a protection method to prevent the metal part of the ready board from electric shock due to electric leakage or electric shock.

7. At the power supply voltage level, the equipment with low voltage safety voltage below 36 V does not need to be grounded, that is, it is not connected to the shell or neutral.

8. In fact, neutral connection is to connect the neutral line to the equipment shell or directly repeat grounding.