spurs

[steve 111]

what is maximum amount of spur sockets taken from a main , the main amperage can be changed easily the wiring is 2.5 and a ring main is not possible without a lot of work as this is a large old house which has been wired this way , there will only be one large consumer a water heater .

 

[telectrix]

you can take only 1 outlet as a spur from a ring final unless you fit a 13A FCU

 

[Dave OCD]

I'm sorry I think you need to word your question a bit better, or it might just be me.

 

[Resu]

I'm sorry I think you need to word your question a bit better, or it might just be me.

Not just you!

 

[telectrix]

i got confused when he didn't mention john wayne (spurs).

 

[Dave OCD]

Better to mention Spurs than Arsenal at the moment.

 

[telectrix]

Arse who?

 

[Pete999]

what is maximum amount of spur sockets taken from a main , the main amperage can be changed easily the wiring is 2.5 and a ring main is not possible without a lot of work as this is a large old house which has been wired this way , there will only be one large consumer a water heater .

1 spur per socket on the RFC See Appendix 15 BS 7671

 

[ChrisElectrical88]

As many as you see to be sensible with a 4mm twin and earth spurring off? I could be wrong, I'm not going to the van at this time for the BYB.

 

[Octopus]

As many as you see to be sensible with a 4mm twin and earth spurring off? I could be wrong, I'm not going to the van at this time for the BYB.

Wrong!

 

[Pete999]

Wrong!

What he said ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ring final circuits and radials - - Yahoo Image Search Results - https://images.search.yahoo.com/yhs/search?p=ring+final+circuits+and+radials&fr=yhs-mozilla-102&hspart=mozilla&hsimp=yhs-102&imgurl=http%3A%2F%2Felectrical-engineering-portal.com%2Fwp-content%2Fuploads%2F2016%2F10%2Fconsumer-unit-ring-final-circuit-ver-2.png#id=2&iurl=http%3A%2F%2Fi69.photobucket.com%2Falbums%2Fi62%2FRFLighting%2FIMGP2837.jpg&action=click

 

[telectrix]

what he said about what he above said ^^^^^. although 4mm is capable of handling the current in itself, adding several outlets to the same point on the rfc could overload the 2.5mm rfc cable especially if the point was close to one end of the rfc.

 

[ChrisElectrical88]

Ignore me then. Thank you for correcting me fellas.

 

[HandySparks]

1 spur per socket on the RFC See Appendix 15 BS 7671

There's no limit on the number of spurs on a ring. But not more than one accessory is allowed on any unfused spur.

 

[Richard Burns]

If you have a ring final circuit then the recommendation is that the number of unfused spurs does not exceed the number of point on the ring. e.g. with ten sockets of the ring a maximum of 10 unfused spurs is recommended. The number of fused spurs is unlimited.
An unfused spur will only supply a single point of use.
In practice you would be looking at the ring loading and ensuring that there were not a concentration of current drawn at one point of the ring.

 

[HandySparks]

If you have a ring final circuit then the recommendation is that the number of unfused spurs does not exceed the number of point on the ring. e.g. with ten sockets of the ring a maximum of 10 unfused spurs is recommended. The number of fused spurs is unlimited.

I'm clearly missing something here, as both you and Pete999 have mentioned this. I can't find anything in the current edition of the regs about a limit on number of spurs, although maybe I've read it in a previous edition.

 

[Pete999]

I'm clearly missing something here, as both you and Pete999 have mentioned this. I can't find anything in the current edition of the regs about a limit on number of spurs, although maybe I've read it in a previous edition.

Have you looked at Appendix 15 in the BYB

 

[Richard Burns]

I'm clearly missing something here, as both you and Pete999 have mentioned this. I can't find anything in the current edition of the regs about a limit on number of spurs, although maybe I've read it in a previous edition.

As I say it is a recommendation not a regulation.
It is mentioned in the OSG under standard circuits.

 

[SparkyChick]

Having re-read the OP, I'm not sure we're talking about a ring....

"what is maximum amount of spur sockets taken from a main , the main amperage can be changed easily the wiring is 2.5 and a ring main is not possible without a lot of work as this is a large old house which has been wired this way"

I think he's talking radial.

 

[HandySparks]

Have you looked at Appendix 15 in the BYB

Yes. Can you tell me where in Appendix 15 this is referred to?