A: PV1-F is TUV Rheinland 2PfG1169 standard, rated voltage 1000V, static test voltage 1800V, H1Z2Z2-K is EU EN50618 standard, rated voltage 1500V; IEC 131 is International Electrotechnical Commission 62930 standard, rated voltage 1500V; PV Wire is US UL4703 standard, rated voltage 1000/2000v. The above are the mainstream standards currently on the market. Domestic component manufacturers generally choose IEC62930, and industrial and commercial applications generally use the H1Z2Z2-K series.