XPost: uk.tech.broadcast, uk.tech.digital-tv, uk.rec.audio   
   XPost: sci.electronics.repair   
   From: spam@spam.com   
      
   On Mon, 30 Jan 2012 08:25:23 +0000, "J. P. Gilliver (John)"   
    wrote:   
      
   >In message <4f25d1d8.46937643@news.eternal-september.org>, Don Pearce   
   > writes:   
   >>On Sun, 29 Jan 2012 20:48:39 +0000, "J. P. Gilliver (John)"   
   >> wrote:   
   >>   
   >>>(I am not on either side in the argument between Jerry and others: I   
   >>>live in UK, but still find ring mains odd.)   
   >>   
   >>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.   
   >   
   >>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.   
   >   
      
   For the most remote socket, the distance can be reduced to almost zero   
   by completing the loop (assuming the run goes around the house and   
   almost back again. For any socket beyond half distance, the run is   
   reduced. Half was just an estimate.   
      
   >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.)   
      
   Spurs are allowed on a ring main, but to a single point only (which   
   can of course be a double socket).   
      
   d   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)