1. Everyone should eye protection. Without this, dont look into the optical port.

2. Dont work after wearing jewelry or watches because these are conductive articles.

3. Make sure that device is dry, if waters exists, shut down immediately. 

4. Make sure that device is properly grounded. 

5. Everyone should use rubber gloves and a protective coat to avoid electrolyte overflow.

everyone should maintain this before maintenance work. 

"Dont work after wearing jewelry or watches because these are conductive articles." All jewelries or some spesific type?