The grounding is good. When a large common mode surge comes in, huge energy can be quickly discharged to the ground through the common mode circuit or shell, which will not cause fatal damage to electrical equipment; If there is no reliable grounding, even if the common mode circuit is set, it has no obvious effect. The huge surge can only be discharged to the power end through the circuit circuit circuit in the electrical equipment, while the withstand voltage of the insulating layer is limited (below 2500V), and the withstand voltage is far lower than the peak voltage of the large surge, which will cause the insulation breakdown of the electrical equipment to the ground.
In addition, grounding is also an important safety measure! If not grounded, in case of insulation failure, the shell is charged, which is easy to cause electric shock! Generally, formal installation requires that special grounding piles be set nearby, and the electrical equipment shall be reliably grounded. At least the electrical equipment shell or LED lamp installation rod shall be reliably grounded.