Ring spurred at origin?

[mattrgee]

Hi all,

DIYer here. My garage has a double socket fed by 4mm2 twin and earth connected to the same circuit breaker has the ring main for the sockets upstairs in the house. The MCB is a B32.

Is the feed in the garage considered a spur from the ring main or is it a separate radial circuit which happens to be on the same MCB? Ideally I'd like to add more sockets to the circuit in the garage (using 4mm2) but is this safe or allowed?

Thanks.

 

[telectrix]

if the CU is in the garage anyway, why not split the tails with \Henley blocks and fit a "garage board". RCD + 2/3 MCBs. then a fault in the garage will not saffect the house CU andyou would have a spare way/s. a 4mm 32A radial for sockets, 6A MCB for lights.....

 

[mattrgee]

Thanks.

Based on what's been said, is the following an acceptable way forward?

>Replace the existing twin socket with a fused spur unit, fused at 13 amps.
>Add additional sockets from the fused spur unit fed by 2.5.

 

[westward10]

This is somewhat unconventional and is clearly ad hoc, yes it should be on its own circuit as I have also suggested but the limitations of what can be added to this spur is clouded by the cable size, 4.0. Appendix 15 which is informative does not demonstrate the use of 4.0 cables/conductors.

 

[westward10]

This is somewhat unconventional and is clearly ad hoc, yes it should be on its own circuit as I have also suggested but the limitations of what can be added to this spur is clouded by the cable size, 4.0. Appendix 15 which is informative does not demonstrate the use of 4.0 cables/conductors.

 

[Octopus]

Thanks.

Based on what's been said, is the following an acceptable way forward?

>Replace the existing twin socket with a fused spur unit, fused at 13 amps.
>Add additional sockets from the fused spur unit fed by 2.5.

Yes .... And it's going to need to be tested

 

[Andy78]

Sounds like a problem waiting to happen. I'd get an electrician in to do this for you properly.

 

[Spoon]

Sounds like a problem waiting to happen. I'd get an electrician in to do this for you properly.

what??? and spend money???? are you mad??

 

[Pete999]

This is somewhat unconventional and is clearly ad hoc, yes it should be on its own circuit as I have also suggested but the limitations of what can be added to this spur is clouded by the cable size, 4.0. Appendix 15 which is informative does not demonstrate the use of 4.0 cables/conductors.

Yes it does on a 32 or 30Amp Radial circuit
Wired in 4mm2
2oAmp Radial wired in 2.5mm2

 

[Pete E]

if the CU is in the garage anyway, why not split the tails with \Henley blocks and fit a "garage board". RCD + 2/3 MCBs. then a fault in the garage will not saffect the house CU andyou would have a spare way/s. a 4mm 32A radial for sockets, 6A MCB for lights.....

I assume that need to be notifiable under Part P?

 

[westward10]

Yes it does on a 32 or 30Amp Radial circuit
Wired in 4mm2
2oAmp Radial wired in 2.5mm2

I am talking ring final circuits. But yes you could consider this a 4.0 radial so I see no need for a fcu but circuit separation should be employed.

 

[Spoon]

I assume that need to be notifiable under Part P?

Yes mate.

 

[mattrgee]

Thanks all.

Tempted to leave it as is for the time being and not add any additional sockets. There's a bathroom renovation on the cards soon where there is an electric shower running from a dedicated circuit. Once that has been decommissioned I'll ask he electrician to create a dedicated circuit for the garage sockets.

 

[Pete E]

Yes mate.

View attachment 41350

I thought so...I think when work becomes notifiable, its probably cheaper and certainly less hassle to get a suitably qualified Spark in...

 

[westward10]

Adding/altering this existing circuit would not be notifiable.

 

[Pete E]

Adding/altering this existing circuit would not be notifiable.

I was referring to the option of fitting an additional CU for the garage etc that was mentioned earlier in the thread..