djk,
I've used 100's of them connectors!. [Linked Image]
We use them over here for fluorescent light fittings in Industrial installations.
Just means that if you have a really bad fault in a fitting, you can unplug it and take off the suspension chains and fix the fitting down on the floor, in relative comfort as opposed to wrestling with it while it is still hanging up.
We call them Pluglit connectors(and Sockets), because they are usually used for lighting installations.
What current rating do your socket/plugs of this type have in Ireland and the UK?. [Linked Image]