I've seen a few fotos recently on vintage mains plugs and other curiositys page on Facebook of the inside of various 11/0,4 kv substations they all seem to have ammeters to measure the current on each phase these are max demand meters how do they reset the maximum value indicator? Also do they have a way to record these values? The meters I've seen all look old as the hills so not sure what recording technology was around years ago. I know these days a lot if these subs have a radio link at least here in SSE land
