If, as I think, your second sentence is saying that an unfused branch from a radial is OK because the branch will be properly protected at the CU, and your 3rd sentence is saying that the reason you need to fuse a branch from a ring is that it won't be properly protected at the CU, can you have a go at explaining it to FR?If they've spurred the conservatory off the existing ring but protected it all with a 13A fused spur first, then it's fine as this 13A fuse prevents the cables being overloaded.
If the original circuit is a radial, same thing goes as it should be protected at the CU by a 20A device anyway, as long as it doesn't exceed maximum cable length.
If they've just spurred off the ring with no protection for the additional points, then there is a risk of the cables being overloaded as the main protective device would be 32A at the CU.
Interesting.ban-all-sheds said:A radial circuit may have any number of unfused branches of any length.
The OSG can't, and doesn't, "demand". It's a guide.Can't wait to see if the 17th OSG demands an FCU for spurs from radials then...
I've done that already.BAS, rather than go blue in the face proving that something hasn't been said or hasn't been written, perhaps you could point us to anywhere where it states that there IS a distinction. Or perhaps point us to anywhere which explicitly describes your version of events.
What if they want to add two sockets to the end of the radial?If I have read this correctly, what FR was talking about was, possibly, where there is an existing Radial, some one may wish to 'spur' off from a socket that is not at the end of the Radial.
It is clear why FCUs are needed if a spur has more than one socket on it.Again in this case, surely for pure over kill again but, also some 'future' proofing an FCU should be added.
That's a separate debate.I must say in most cases I am still really struggling to think why anyone would fit a radial over a ring final.
It does not need to make a distinction. It talks about spurs. Spurs are by definition branches from ring finals, not radials, therefore the section on spurs is not talking about branches from radials.Nice discussion, I have picked up my OSG to read this bit, 16th Ed. OSG, from my reading it does not make a distinction from spurs on Ring Final or radial, just points out the need to use FCU if more than one socket is to be added..
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