Meters get swapped regularly for recalibration, so sometimes fairly new meters find their way into extremely old installations.

Yes, it's a light switch, nut not one that screws into an ES socket. It's a waterproof outdoor switch with a drip cap above the wires! I'll give my best to save that old stuff as they rewire the cellar.

Yesterday I received a sudden cold shower... I was carrying a door which was taller than the ceiling. trying to get it upright I hit one of the water pipes and a load of condensate dripped onto my neck...

On the other hand, it could have been far worse considering the state of the pipes... [Linked Image]