Spur of external socket

[JayAr91]

external socket on the outside of the house, power needed in the shed, isit ok to spur of this to go 10meters into the shed underground using swa? If so, what's the best way?

 

[telectrix]

depends on what type of circuit the outside socket is on. it might be on 32A ring, or spur off ring, or on a radial. if on a ring, i'd advise inserting a 13A FCU before spurring off the shed, then you can spur off in 2.5mmSWA, appropriately installed,into a socket in shed, then a 5A FCU in shed for light. RCD protection will be required, either in house or in shed.

 

[Spoon]

external socket on the outside of the house, power needed in the shed, isit ok to spur of this to go 10meters into the shed underground using swa? If so, what's the best way?

@telectrix pretty much sums it up.
Have toy had a proper look at the outside socket, to see how its wired up. Is it on the FRC, radial or a spur?

 

[JayAr91]

It's on a ring, my plan was to come of the ring with a fused spur, then run swa 2.5 straight to the shed?

 

[Spoon]

It's on a ring, my plan was to come of the ring with a fused spur, then run swa 2.5 straight to the shed?

So as @telectrix post above then?

 

[King84]

depends on what type of circuit the outside socket is on. it might be on 32A ring, or spur off ring, or on a radial. if on a ring, i'd advise inserting a 13A FCU before spurring off the shed, then you can spur off in 2.5mmSWA, appropriately installed,into a socket in shed, then a 5A FCU in shed for light. RCD protection will be required, either in house or in shed.

Verry nicely explained telextix but I have a hypothetical question.

Lets say the same scenario outside socket which is on the ring, you spur it off for shed but first you install FCU 13A then SWA 2.5 all the way to shed. but how would you use RCD in shed as you usually have RCD in the main consumer unit but you said either in CU or in shed. so hypothetically if he only wants to use it in the shed, how is he going to install in the Shed on 13A spur ? thanks

 

[Spoon]

Verry nicely explained telextix but I have a hypothetical question.

Lets say the same scenario outside socket which is on the ring, you spur it off for shed but first you install FCU 13A then SWA 2.5 all the way to shed. but how would you use RCD in shed as you usually have RCD in the main consumer unit but you said either in CU or in shed. so hypothetically if he only wants to use it in the shed, how is he going to install in the Shed on 13A spur ? thanks

Could just use a RCD Fused Spur.

 

[telectrix]

Verry nicely explained telextix but I have a hypothetical question.

Lets say the same scenario outside socket which is on the ring, you spur it off for shed but first you install FCU 13A then SWA 2.5 all the way to shed. but how would you use RCD in shed as you usually have RCD in the main consumer unit but you said either in CU or in shed. so hypothetically if he only wants to use it in the shed, how is he going to install in the Shed on 13A spur ? thanks

if you feed the spur from a RCD, you don't want another RCD in the shed. however, if the spur is from a RCD in the cU that is shared with other circuits in the house,a fault on the spur durcuit would disable several circuits in the house,.

 

[King84]

Could just use a RCD Fused Spur.

I was just digging more into RCD fused spur and it is Bs 7288 and it does not comply with regulation so how can one use it to provide additional protection in the scenario above

 

[Spoon]

I was just digging more into RCD fused spur and it is Bs 7288 and it does not comply with regulation so how can one use it to provide additional protection in the scenario above

We had this discussion in another thread. It seems it has been missed from the regs, and they will be adding it.
This may need confirming.

 

[King84]

We had this discussion in another thread. It seems it has been missed from the regs, and they will be adding it.

Ok thanks for clarifying

 

[Spoon]

Ok thanks for clarifying

I edited my above post to say that this may need confirming though.

 

[King84]

I edited my above post to say that this may need confirming though.

Interesting but until they do not consider this as compliance with Bs 7671 then considering above situation for feeding Shed with Fused spur RCD socket then this would be considered as departure rather then compliance.

 

[Spoon]

Interesting but until they do not consider this as compliance with Bs 7671 then considering above situation for feeding Shed with Fused spur RCD socket then this would be considered as departure rather then compliance.

While adding a RCD Fused Spur may be a departure from the regs, it would be safer than not adding one.
To comply with the regs you could change the breaker for the RFC to a RCBO