What protective measures should be taken for the shell of electrical equipment?

The enclosure of electrical equipment shall be provided with protective grounding protection measures. In order to prevent the metal shell of electrical equipment, the frame of power distribution equipment and the line tower from being charged and endangering the safety of the obligee and equipment, the shell of electrical equipment should have protective grounding protection measures, and the protective grounding is generally not charged. However, after the insulation material is damaged or under other circumstances, the metal part of the electrical appliance that may be charged (that is, the metal structure part insulated from the charged part) is reliably connected with the grounding body through wires, which is a protective wiring method. Grounding protection is used in the power supply system (three-phase, three-wire system) where the neutral point of distribution transformer is not directly grounded, so as to ensure that the voltage to the ground generated by the leakage of electrical equipment due to insulation damage does not exceed the safety range.