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its used to interupt the supply to the hot water storage heaters at peak demand times sometimes with a Hz sensitive relay or a "pilot wire' run with the network supply and into the house.

as i know it - cheers

Thanks -- Interesting arrangement.

The closest I've seen to that is the system used in some French houses which automatically cuts-out heating loads when more power is needed on regular portable appliance outlets. It's used where service is of limited capacity.