matters needing attention:

1. Holding the hemp electrical box, there is already a good grounding. When using a 220V power supply, the power socket must have a good grounding.

For the personal safety of the operator, they must wear insulated long gloves and insulated shoes before operating. The electrodes at both ends of the hemp electrode must not touch the human body to avoid danger.

3. The voltage regulator should regularly check the carbon brush during normal operation to ensure that the carbon brush and the contact part do not exceed two line widths. After the work is completed, the power should be cut off.