Can i spur more then once with bigger cable?

[tomodo]

from my computer

 

[tomodo]

View image: CCF12022015 00000

 

[tomodo]

I think this seems okay ? what do you guys think? ^^^^^^^

 

[Charlie_]

I'm not trying trying to have a pop at you personally..
I'm just making a general observation of how things seem to be, no offence intended..
Just seems so strange how so many are reliant on guides, etc for such basic information..

 

[Sparkie30]

You wouldn't be allowed anyway its copyright material and would be removed straight away ... with a PM to warn you as well.

oops forgot all about copyright thing. Thanks

 

[tomodo]

the radial circuit is the one im adding to it

 

[tomodo]

View image: CCF12022015 00000

Please have a look you have to scroll down

 

[Charlie_]

Your doodle gets the thumbs up from me
apart from it looks as though a six year old has drawn it.. Wink wink

 

[tomodo]

haha yeah my writing / drawing isnt the neatest

 

[HappyHippyDad]

This has been discussed a few times and some seem to find it acceptable to spur off a ring main with 4mm so that you can have more than one spur. Their reasoning is that it is safe because it is protected by a 32A MCB.

I dont feel very comfortable with this and would never do it, my reasoning being that it is a ring, not a radial. If you create a radial off of a ring then you could well be unbalancing it. Plus if someone sees a 4mm radial they may add to it at a later stage, unbalancing the ring even more.

If you are taking a 4mm cable from one socket to the next then I cant see why you couldn't just extend the ring which I think would be the best option.

I haven't got my BS7671 to hand, but I'm pretty sure it doesn't mention spurring off a ring in 4mm.

 

[davesparks]

It is a departure from the standard ring circuit, which doesn't necessarily mean it is wrong but does need a bit more thinking about.

 

[tomodo]

hmmmmm

 

[andyb]

I think HHD is right.
Can you not put the fused spur at beginning of the spur from the ring?

 

[Silly Sausage]

hmmmmm

The FCU is 13A max, so the proposed circuit spur is essentially a triple socket outlet.
I would say it's fine.

(App 15 is 'Informative' only. Other circuit layouts are available!)

 

[shanky887614]

be alot of hassle it goes right up to the ceiling which is about 20 metres high

? cut and joint

 

[Pete999]

The FCU is 13A max, so the proposed circuit spur is essentially a triple socket outlet.
I would say it's fine.

(App 15 is 'Informative' only. Other circuit layouts are available!)

Whereabouts are these other circuit layouts described?

 

[Silly Sausage]

Whereabouts are these other circuit layouts described?

In my brain after applying some thought

 

[Pete999]

In my brain after applying some thought

Yes BS 7671 is an informative document, but if we go on deviating just because we "gave it some thought" and thought we were right and someone got hurt because we thought it was alright, where would we stand in a court of law, "well your honour I thought it would be OK"

 

[Silly Sausage]

'They' are just 'standard' circuits.
Some guys on here have lights on rings or octopus/spider circuits or god help us, Neutrals at the switches!
They are all equally valid. As long they fulfil the Chapter 4 design criteria, all is well in the world!

 

[GEOFF S]

The onsite guide is not for comercial installations.

So im taking a different footing here, the ring circuit design in the onsite guide is for the purpose of a domestic single phase system amongst other prerequisites. So the installed ring is the design of someone? You need to prove it meets the requiremnts of BS7671. Specifically 433.1.103 plus the other general requirements.

Cheers