XPost: sci.electronics.repair, uk.rec.audio, uk.tech.broadcast   
   XPost: uk.tech.digital-tv   
   From: dave@davenoise.co.uk   
      
   In article <6c6mggAIioKPFwRy@jasper.org.uk>,   
      Mike Tomlinson  wrote:   
   > In article <4f298157.5289806@news.eternal-september.org>, Don Pearce   
   >  writes   
      
   > >Back in the olden days there was always a cooker spur rated at 30   
   > >amps. That came straight from the fuse board to the cooker, which was   
   > >wired into the wall plate without a socket.   
      
   > Also the immersion, on its own 16A radial.  Though sometimes you could   
   > find it wired into a ring.   
      
   This was common once, but IIRC regs changed requiring new builds (or   
   re-wires) to have it on a radial.   
      
   IIRC, the concept of a ring requires diversity - ie no continuous high   
   loads. Most domestic high loads are for fairly short periods of time. But   
   heating usually more constant. Water heating is sort of in between - hence   
   the regs changing.   
      
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       Dave Plowman        dave@davenoise.co.uk           London SW   
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