IEC 62196: Plugs, socket-outlets, vehicle connectors and vehicle inlets - Conductive charging of electric vehicles - Part 3-1: Dimensional compatibility and interchangeability requirements for a.c./d.c. pin and contact-tube vehicle couplers - Combined a.c./d.c. accessories for use with IEC62196-2 Type 1 and Type 2 a.c. rated accessories and other combined a.c./d.c. accessories, for d.c. charging