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I`ve been thinking

OK the title might startle some who know me.

Ring Final rules.

What is the intention behind the rule "no more spurs than points on the ring".

I think most of us who have run rings would almost exclusively put every point on a ring and no spurs at all.

Spurs are then usually just additions.

One spur max per point.

One spur allowed at origin.

If I saw a ring with say 12 points on ring and one ring per point and say 1 point at origin that would be 12 on ring and 13 spurs that would not worry me.

In fact if I saw say 5 points at origin it would not worry me either.

If I saw 12 on ring each with one spur then 5 spurs at origin then 11 spurs on joints between points woul I worry?

No I would not although this "golden rule" would have been well and truly broken.

I think the rule intention was purely good housekeeping to keep us all on the straight and narrow.

In fact some on here have mentionded a ring in a loft with junction boxes dropped dow to spurs. Therefore all spurs and not on ring.

Note I did not pick the number of 12 points on ring for any reason, I could have picked 5 or 50 or 5000.
Parents
  • You can think up all sorts of hybrids. I see no problem with a ring in the ceiling void or loft space with spurs dropping down (or rising up) from JBs. One could perfectly legitimately have more than one spur from a particular JB. I see no reason in principle why you should not spur off to multiple sockets using 4mm2 cable (even though it is not shown in Appendix 15).


    However, the more complicated it gets, the less reason I see for a ring - just make it a 4mm2 radial.


    What you don't want is so many alterations and additions that it becomes a snakes' wedding.
Reply
  • You can think up all sorts of hybrids. I see no problem with a ring in the ceiling void or loft space with spurs dropping down (or rising up) from JBs. One could perfectly legitimately have more than one spur from a particular JB. I see no reason in principle why you should not spur off to multiple sockets using 4mm2 cable (even though it is not shown in Appendix 15).


    However, the more complicated it gets, the less reason I see for a ring - just make it a 4mm2 radial.


    What you don't want is so many alterations and additions that it becomes a snakes' wedding.
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