There's a spare switched 3 Phase socket in the barn that I can use for the ramp (saves any drokking about with the existing electrics, i.e. me spending cash I don't have/need to!) but it's not an IEC 3 phase connector, it's much older and I don't recognise it.
Anyone know what it's called/where to get one?
It's a proper industrial fitting (metal case, screw on outer sleeve etc.) 15 amp rated.
And an existing/corresponding plug, for comparison;
Seems to have a makers mark of "LD" inside a diamond.