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There are no specific regs as to how long it is.
However it will have to meet regulations regarding volt drop calculations.
 
as long as the Zs at the spurred socket is below 1.09 ohms it's good (assuming a 32A type B MCB), and of course VD below 5%. (11.5V).
 
If if longer than a drum of 2.5 then its too far...:cool:
In all seriousness if we are talking domesticated dwellings then it’s unlikely to ever exceed maximum permissible lengthy
 
I want t run a spur(using 2.5mm cable) from a socket on a ring main . how long can the spur cable be?
Lots of imponderables to deal with Voltage at final destination ( have any volt drop calculations been done?)
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not sure how to do v/drop calc , the spur will be approx 4m. i want to run a tumble dryer from the spurred socket
What is the Electrical load of the tumble dryer?
 
if you're going to run 4m 2.5 cable, why not run 2 cables and extend ring in existing socket using wagos or ideal in line splice connectors. it's less than a fiver for extra materials
 
Lots of imponderables to deal with Voltage at final destination ( have any volt drop calculations been done?)
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What is the Electrical load of the tumble dryer?
[/QU
if you're going to run 4m 2.5 cable, why not run 2 cables and extend ring in existing socket using wagos or ideal in line splice connectors. it's less than a fiver for extra materials
thought about extending ring but nearest point to break into it easily and fit conector block will be 6/7m . The 4m length would be fed from back of socket.
 
why can't you run 2 legs from the socket. joint in back box?like here?

how long can a spur cable be rfcextend - EletriciansForums.net
 
thought about extending ring but nearest point to break into it easily and fit conector block will be 6/7m . The 4m length would be fed from back of socket.
You will need to be certain that the socket you intend spurring from is actually part of a RFC and not already a spur from the RFC, and your addition is NOT a spur from an existing Spur
 
You will need to be certain that the socket you intend spurring from is actually part of a RFC and not already a spur from the RFC, and your addition is NOT a spur from an existing Spur
the socket I am intending to spur from is part of the ring main. and is not a spur
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if you're going to run 4m 2.5 cable, why not run 2 cables and extend ring in existing socket using wagos or ideal in line splice connectors. it's less than a fiver for extra materials
thanks , will have another look at options
 
the socket I am intending to spur from is part of the ring main. and is not a spur
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thanks , will have another look at options
see picture in post #9. it's 1 I did last year. obviouslytrhe red/blacks are existing. the brown/blues are my rfc extension., clipped about 3m under floor in crawl space. ( this is what thin apprentices are for. :):):)).
 
because today he wants to run a tumble dryer; next week he may want a dishwasher and a washing machine in the same location. as it's only a 4m run, why skimp for the sake of a few quid?
nope
because today he wants to run a tumble dryer; next week he may want a dishwasher and a washing machine in the same location. as it's only a 4m run, why skimp for the sake of a few quid?
but at the moment he wants to run a tumble dryer, end of, perhaps he might want a sauna, who knows, but for a tumble dryer, its fine
 
because today he wants to run a tumble dryer; next week he may want a dishwasher and a washing machine in the same location. as it's only a 4m run, why skimp for the sake of a few quid?
There would be no reason why a WM and DW could not both run on a double socket from a properly wired spur.
 
nope

but at the moment he wants to run a tumble dryer, end of, perhaps he might want a sauna, who knows, but for a tumble dryer, its fine
don't dispute that, but for the cost involved in extending the rfc, why limit the work to a single accessory point.
 
That's a hell of a big cupboard he has there... room for a tumble drier, dishwasher, washing machine and now a sauna !!
 

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