1, the shell of the electrical equipment should be protective grounding or zeroing, in order to prevent personal electric shock accidents and ensure the normal operation of the equipment. The principle of grounding protection is to limit the leakage current to ground leakage equipment, once more than the safety range, the protector will automatically cut off the power supply. Zero protection is the use of zero line, in the insulation damage after touching the shell to form a single-phase metallic short circuit, the use of short-circuit current prompted by the line on the rapid action of the protective device.
2, the insulation capacity of electrical equipment should be in line with relevant standards, and regular testing. Insulating materials can effectively prevent the current flow to the unintended path, reducing the risk of electrocution.