You don't need to take any online certificate for special types of work, just sign up for the online examination for high and low voltage electricians in Suzhou Labor Road "Electrician Skills Training Center". It is recommended to take the high-voltage electricity certificate training exam, which is relatively hard and pays well after getting the notebook, but the general time is one to three months of full-time study. It is best to have a letter of introduction from the company when signing up. Others, such as identity cards, can also be reported to foreigners themselves. In addition, it is best to have a certain electrician foundation.