Quote:
Originally Posted by paulsherwin
many buildings had separate ring mains for things like floor polishers and vacuum cleaners. It was considered desirable to keep these appliances off the 'standard' supply
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I think the idea was to make sure that certain things -- tills, revolving display stands, the managing director's coffee maker -- would not be unplugged by cleaners in search of a power point, nor knocked offline if a malfunctioning Hoover or polisher blew a fuse in the distribution board.
Oh, and I've fixed the link to the BS546 plug pictures:
Try this one.