UK Spur off a 4mm twin and earth, 32amp radial

[littlespark]

There is a recommendation that loads of 2Kw and above need to be on their own dedicated circuit, not fed via a 13 A spur

I think we've established that this wont be on a 13A spur... its on a radial, wired in 4mm, which could have a 32A OCPD if someone changes it back from a 16.

As above, if you want to isolate the outside sockets, then a 45A double pole switch ... (for a cooker or shower - no fuse) before going outside will suffice.


Edit, Afterthought: If youre doing any work to this circuit, you must ensure it is RCD protected... i dont think it was mentioned on the OP

 

[westward10]

There is no reason why it cannot be extended in 4.0 and upgraded to 32A however as previously mentioned the installation method may not permit it. If you are going to contain this cable in conduit then 32A is not an option.

 

[JLH520]

Thank you all for (A) putting me straight on a couple of points, and (B) providing the answers I was looking for.

To clarify a couple of points - yes the circuit is, and will continue to be RCD protected and I will extend onto the end of the radial, rather than cutting in between the existing sockets (not sure if that would change anything.)

I will also change the circuit MCB to a 32 amp to cope with the heaters.

Thanks again.

 

[telectrix]

Thank you all for (A) putting me straight on a couple of points, and (B) providing the answers I was looking for.

To clarify a couple of points - yes the circuit is, and will continue to be RCD protected and I will extend onto the end of the radial, rather than cutting in between the existing sockets (not sure if that would change anything.)

I will also change the circuit MCB to a 32 amp to cope with the heaters.

Thanks again.

spot on.

 

[westward10]

Thank you all for (A) putting me straight on a couple of points, and (B) providing the answers I was looking for.

To clarify a couple of points - yes the circuit is, and will continue to be RCD protected and I will extend onto the end of the radial, rather than cutting in between the existing sockets (not sure if that would change anything.)

I will also change the circuit MCB to a 32 amp to cope with the heaters.

Thanks again.

How is the new cable going to be installed.

 

[JLH520]

How is the new cable going to be installed.

…was planning to run 4mm SWA to the new sockets. Had planned to use a short run (approx 1 metre) of 4mm twin and earth in a conduit between the two sockets rather than use SWA between the two sockets. Is 4mm T&E permissible in conduit over this short distance?

 

[westward10]

…was planning to run 4mm SWA to the new sockets. Had planned to use a short run (approx 1 metre) of 4mm twin and earth in a conduit between the two sockets rather than use SWA between the two sockets. Is 4mm T&E permissible in conduit over this short distance?

Contained in conduit it would not be rated at 32A unless it is singles.

 

[JLH520]

Contained in conduit it would not be rated at 32A unless it is singles.

Ok understood, thanks.

 

[brianmoooore]

If the bit in the conduit only feeds one socket, then it doesn't need overload protection - just short circuit protection.

 

[JLH520]

If the bit in the conduit only feeds one socket, then it doesn't need overload protection - just short circuit protection.

Ok, thanks Brian, that helps.