The International Electrotechnical Commission (IEC) has released IEC 60309-5:2017. This standard pertains to Plugs, socket-outlets and couplers for industrial purposes – Part 5: Dimensional compatibility and interchangeability requirements for plugs, socket-outlets, ship connectors and ship inlets for low-voltage shore connection systems (LVSC) and is now available on the IEC webstore.
Description: “IEC 60309-5:2017 applies to a single type of plug, socket-outlet, ship connector and ship inlet, hereinafter referred to as accessories, intended to connect ships to dedicated shore supply systems described in IEC/IEEE 80005-3. This part of IEC 60309 applies to three-phase accessories with an earth contact and with four pilot contacts.”
*Description from the IEC Website.