spur off a ring

[1983]

If u wanted to spur off a ring say for tv point is it true that u have to either down grade the 32a to a 20a or use a fused spur b4 the point

 

[dazza1981]

HI
you can spur off a ring main as many times as you like provided its fused down... but your limited to 13 amps from the fuse!!

 

[Badged01]

If u wanted to spur off a ring say for tv point is it true that u have to either down grade the 32a to a 20a or use a fused spur b4 the point

No, you can spur off an install another socket. If you have the BGB Appendix 15 gives the words and pictures!

 

[1983]

That's what I thought untill some spark said u can't because it's only 1 leg

 

[Badged01]

That's what I thought untill some spark said u can't because it's only 1 leg

He wasn't an "industrial electrician" by any chance?

 

[dazza1981]

He wasn't an "industrial electrician" by any chance?

No a painter!!!

 

[Badged01]

No a painter!!!

There you go then, he knows his stuff!

 

[1983]

Lol domestic and commercial spark I've worked with so many different sparks and this the 1st time I've heard of it I new that its one spur off a socket or a fused spur then as many as u like of that fused spur but 1st time I've heard that u either down grade the 32a to 20a or use a fused spur I through I'd here what more experienced sparks would say . His theory is that because it's on a 32a and only 1 leg which is bein taken off a socket is going to say the tv point that 32a will be going through that 1 leg but how if 32a ant been drawen

 

[Badged01]

Depending on how you install it, as a general rule if using 2.5 T&E your cable CCC is going to be circa 25A. Double socket with 2 x 13A plugs = max 26A. Hence one socket OK but more than 1 socket fuse down.

 

[BES]

Lol domestic and commercial spark I've worked with so many different sparks and this the 1st time I've heard of it I new that its one spur off a socket or a fused spur then as many as u like of that fused spur but 1st time I've heard that u either down grade the 32a to 20a or use a fused spur I through I'd here what more experienced sparks would say . His theory is that because it's on a 32a and only 1 leg which is bein taken off a socket is going to say the tv point that 32a will be going through that 1 leg but how if 32a ant been drawen

Ask him to spur directly from rfc 32a mcb at board that will really blow his mind

 

[Badged01]

Ask him to spur directly from rfc 32a mcb at board that will really blow his mind

Nah, hes far too sharp! He will have already read the comment in app 16 and know all about it .....

 

[Engineer54]

Lol domestic and commercial spark I've worked with so many different sparks and this the 1st time I've heard of it I new that its one spur off a socket or a fused spur then as many as u like of that fused spur but 1st time I've heard that u either down grade the 32a to 20a or use a fused spur I through I'd here what more experienced sparks would say . His theory is that because it's on a 32a and only 1 leg which is bein taken off a socket is going to say the tv point that 32a will be going through that 1 leg but how if 32a ant been drawen

Now come on, just think about this yourself, why would the load of the overall ring, be tempted/persuaded to pass along any spur off that ring??

 

[BES]

And never mention if you spur from 13a fcu you could you use 1.5 t&e he'll never get his head round that

 

[piccollo]

Have seen a bungalow rewired, where there was penny whistle [ 5/8"] conduit drops to possibly single socket boxes. The ring mains were run around the loft [neatly clipped] with a junction box at / near the rubber bushed conduit drops & a single tw & e 2.5mm2 to each surface mounted double socket.
Presume to save decorating / cutting chases etc.

 

[Knobhead]

Have seen a bungalow rewired, where there was penny whistle [ 5/8"] conduit drops to possibly single socket boxes. The ring mains were run around the loft [neatly clipped] with a junction box at / near the rubber bushed conduit drops & a single tw & e 2.5mm2 to each surface mounted double socket.
Presume to save decorating / cutting chases etc.

And???

 

[trev]

Now come on, just think about this yourself, why would the load of the overall ring, be tempted/persuaded to pass along any spur off that ring??

Maybe this fine upstanding representative of our trade thinks it's like a set of train tracks. You know, it goes careening down one cable and without downgrading it could all rush along the cable to this spur.
Peep Peep Thomas

 

[Des 56]

Peep Peep Thomas
The cable now arriving at station spur is the 2.5 from ring

 

[trev]

Or even 1.5 if fused down accordingly

 

[Geordie Spark]

He wasn't an "industrial electrician" by any chance?

It's probably that one who had an "impossible" to find fault on an RCD and offerered Wor Trev £1k to find it, then welshed (no offence Des) on the deal!

 

[7029 dave]

Come on, you can spur of a rfc from each s/o without fusing down, or from origin ie cu. Forward fusing does not come into it if using the appropriate size cable.

 

[Selfmade]

Sounds like that guy doesn't know much about electricity or wiring! It's max one double socket off a spur from a RFC, (taking account of cable derating factors such as thermal insulation of course). Any more than that and it has to be a fused spur, as then you could draw more than 26A.

 

[SirKit Breaker]

HI
you can spur off a ring main as many times as you like provided its fused down... but your limited to 13 amps from the fuse!!

You should have also added, that whilst he can extend as you say, he must also consider the volt drop limitations, which he can calculate, and also ensure that the disconnection times can still be met, and then there is the correction factors for the installation reference method. i suggest he goes back to the painter in question, and tell him that he didn't give him the full info.

Right i am off to change my gas boiler. The window fitter said it was easy, just join the pipes back up, put wet ones to wet ones, dry ones to dry ones and see what happens, apparently if i have got it right it will just work, and if not there will be some sort of bang, but i haven't to be worried about it.