The standard is JB/T 8675-1997 "rectifiers for electro-coatings (neq IEC 146-1-1: 1991) ", which specifies the technical requirements for rectifiers for electro-coatings. The content covers electrical performance (output voltage/current range, ripple coefficient), structural design (insulation grade, heat dissipation capacity), safety protection (overload, short circuit, overheating protection), corrosion resistance (surface protection treatment) and compatibility (matching with Electrophoresis process parameters), etc. The performance index and inspection rules are clarified. DC power supply equipment suitable for electro-coating production lines provides technical basis for its design, manufacturing and quality control to ensure stable power supply in the process of Electrophoresis, ensure coating uniformity and equipment operation safety, refer to international standards but there are technical differences.