XPost: uk.tech.broadcast, uk.tech.digital-tv   
   From: charles@charleshope.demon.co.uk   
      
   In article <5259a82fcbdave@davenoise.co.uk>,   
      Dave Plowman (News)  wrote:   
   > In article ,   
   >    J. P. Gilliver (John)  wrote:   
   > > >Why do you find ring mains odd? Once you have daisy chained all the   
   > > >sockets it is an extremely sensible idea to complete the loop back to   
      
   > > If you happen to have laid them out in a ring manner anyway, yes.   
      
   > Why wouldn't you? There are less runs back to the CU than doing the same   
   > with radials, so surely not too difficult to design?   
      
   > > >the distribution board. For the cost of a few feet of cable, you have   
   > > >halved both the effective resistance of the mains and the distance to   
   > > >the furthest socket. I can't imagine a single reason not to do it.   
   > > >   
   > > >d   
      
   > > I can see the halving of the resistance (well, at the most remote point   
   > > anyway), but not the halving of the distance.   
      
   > > I think maintenance (I mean when modifying, not just general wear and   
   > > tear): most extras added to ring mains are spurs. (Also, instinctively,   
   > > it's easier to know when one is isolated with a spur, though that   
   > > shouldn't be done that way.)   
      
   > You are allowed to add spurs within the regs, but why is it so much more   
   > difficult to simply add a socket properly to the ring?   
      
   Access to the wiring might be a problem.   
      
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