... for high temperature environment such as household appliance, electrical industry, 50Hz, 1kV and voltage below. StandardNational Standard ... GB 5023-1997, JB 8734-1998, etc.International Electrical Committee Standard 227 IEC, etc.British Standard (BS), ... for high temperature environment such as household appliance, electrical industry and telecommunication equipments, 50Hz, 1kV and voltage below ...