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Standards Development
This document applies to plugs and fixed or portable socket -outlets for DC only, with a rated voltage from 50 V up to and including 400 V and a rated current not exceeding 32 A, intended for household and similar purposes, either indoors or outdoors.
The rated current is limited to 16 A maximum for DC accessories provided with screwless -type terminals.
Plugs and socket-outlets covered by this document are intended for use in circuits where: basic protection, or an over current protection (of 16 A or less for each socket -outlet), or the fault protection (indirect contact protection), and additional protection.
Plugs and socket-outlets complying with this document are suitable for use at ambient temperatures not normally exceeding +40 °C, but their average temperature over a period of 24 h does not exceed +35 °C, with a lower limit of the ambient air temperature of −5 °C.
Developing new energy sources such as wind power and photovoltaics, and accelerating the replacement of fossil fuels with clean energy, are important measures for countries around the world to address climate change and energy crises. According to data, the global installed capacity of renewable energy has exceeded 560 GW in 2023, and it is expected that by 2050, the scale of wind and solar energy installations will increase by about 14 times.
The application of direct current generated by new energy can save the inverter (DC/AC), rectifier (AC/DC) and other links in electrical connections, and improve energy utilization efficiency. The global green energy transition has promoted the development of direct current electricity.
DC plugs and socket-outlets for household and similar purposes are used in DC buildings to achieve power transmission between the building's DC microgrid and DC electrical loads. Due to the different working principles of DC and AC electricity, DC plugs and socket-outlets shall not be interchangeable with existing AC plugs and socket-outlets worldwide. Moreover, DC plugs and socket-outlets without any protection cause visible arcing when making and breaking, so leading to accidents for consumers and product s, and even causing fires.
IEC 60884 only applies to AC plugs and socket-outlets. IEC TS 62735 only applies to plugs and fixed socket- outlets with rated power of 2.6 kW and 5.2 kW, and rated voltage range from 294V to 400V DC, which are only applicable to class I equipment and supply power to DC information and communication technology equipment. IEC 62196 applies to the field of conductive charging for electric vehicles, providing technical requirements and test methods for plugs and socket-outlets with rated operating voltage not exceeding 690V AC, 50-60Hz, rated current not exceeding 250A, and rated operating voltage not exceeding 1500V DC, rated current not exceeding 800A. However, for household DC plugs and socket -outlets, the product ratings specified in this document are too high and the construction is too complex, which are not suitable for household conditions. At present, there is no international standardizing document applicable to household DC plugs and socket-outlets.
This document aims at developing a technical specification for household DC plugs and socket -outlets, so as to solve the problems mentioned above and making international technical requirements reach an agreement.
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