Hi, Hope someone can help me. I would like to know if it is possible to install a fused spur in a ring main. Not as a spur from a double socket but actually included as part of the ring. Any help appreciated.
No as if fused it's not a spur but a radial. But yes you can use a FCU to tap into a ring.
Seems I got it wrong. Re-read the red book and it seems there is no difference between spur and radial both can be new circuits.No as if fused it's not a spur but a radial. But yes you can use a FCU to tap into a ring.
How is it not a spur - it's comming off a 'final circuit'!
If it came off it's own MCB in the CU it would be a radial final circuit.
If it's coming off a RFC, it's a spur, no matter how or where you join it.
Seems I got it wrong. Re-read the red book and it seems there is no difference between spur and radial both can be new circuits.
Maybe you can explain "final circuit" my English would have thought it would have been the last circuit. However although radial is not defined circuit is and there is no way the assembly after a FCU can be considered as anything but a circuit in it's own right. So it seems we can have a final final circuit. Guess that would be at the VERY end!
Seems I got it wrong. Re-read the red book and it seems there is no difference between spur and radial both can be new circuits.
Maybe you can explain "final circuit" my English would have thought it would have been the last circuit. However although radial is not defined circuit is and there is no way the assembly after a FCU can be considered as anything but a circuit in it's own right. So it seems we can have a final final circuit. Guess that would be at the VERY end!
Why, because it has it's own overcurrent protective device because of a change of current carrying capacity.
So, on your 'Schedule of test results', you have listed, (along with the other 'final' circuits'), every fused spur......because they are circuits in their own right........with their very own R1+R2, IR, Zs etc.
'Final Circuits' are as the name implies - the final circuits out of the DB/CU.
'Distribution Circuits' feed other CU/DBs.
'Spurs' are parts of a 'Final Circuit' that aren't part of the normal make-up of that circuit, and are sometimes fused.
It really isn't rocket science, and you don't need the regs to tell you this..
Ring Final Circuit - a 'final' circuit
Radial Final Circuit - a 'final' circuit
1.5mm, 2.5mm radial joined to RFC - a 'spur'
1.5mm joined to a 2.5mm 'Radial final circuit' - a spur
1.5mm, 2.5mm joined to a 4.0mm 'Radial final circuit' - a spur
2.5mm & additional socket connected between two sockets on 'RFC' - extension of final circuit
2.5mm joined to a 2.5mm 'Radial final circuit' - extension of 'final circuit'
4.0mm joined to a 4.0mm 'Radial final circuit' - extension of 'final circuit'
So, fused or not, if it's coming off a RFC, and not part of the 'ring', it's a spur!
Hi, Hope someone can help me. I would like to know if it is possible to install a fused spur in a ring main. Not as a spur from a double socket but actually included as part of the ring. Any help appreciated.
CorrectA fused spur can be added as part of the ring or it can be a spur of a socket that is part of the main ring that is not spurred from already. Is this correct?
NO! The fuse is on the output side of the FCU. It only pops if the load on the connected side exceeds the fuse value.Questions:
1. in the case where the fused spur is added as part of the ring, if a issue was to occur and the fuse pops, would it break the ring and therefore stop other outlets on the ring (not the spur) from working?
Spurs are not "inline". If the Socket/FCU is "inline" then it is part of the ring. If the FCU is copnnected to a socket on the ring by a single piece of cable then that is a spur.2 in case of the spur being inline, could I request this to be a socket combined with a fused spur I order to allow me to retain the original socket but also combine as a fused spur.
2 in case of the spur being inline, could I request this to be a socket combined with a fused spur I order to allow me to retain the original socket but also combine as a fused spur.
Correct
NO! The fuse is on the output side of the FCU. It only pops if the load on the connected side exceeds the fuse value.
Spurs are not "inline". If the Socket/FCU is "inline" then it is part of the ring. If the FCU is copnnected to a socket on the ring by a single piece of cable then that is a spur.
But, yes you can have a socket and an FCU next to each other, connected either as a spur or as part of the ring..
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