IEC 60309 – Wikipedia

Industrial and multiphase power plugs and sockets - Wikipedia

AC power plugs and sockets - Wikipedia

Industrial and multiphase power plugs and sockets - Wikipedia

Industrial and multiphase power plugs and sockets - Wikipedia

File:IEC 60309-2 32-30A 3P low-volt socket.svg - Wikipedia

IEC 60309 – Wikipedia

AC power plugs and sockets - Wikipedia

Industrial and multiphase power plugs and sockets - Wikipedia

IEC industrial standard

IEC 60309 - Wikipedia

AC power plugs and sockets: British and related types - Wikipedia