Garage supply

[uksparks]

Hi,

i went ent to look at a job this morning where someone needs power to a remote garage in the garden, it's only about 8 - 10 meters away from back of house.

unfortunately it's not really feasible to run it on its own circuit for quite a few reasons, yet this would have been my preferred method.

is the general accepted method when coming off a ring to essentially create a lollipop circuit, so connect from ring to SWA back to small garage cy, is the accepted method just put a 13A FCU off the ring and run a bit of 2.5 swa to a garage cu?

obviously I'll check the zs and R1+R2 at point of spurring to calculate max length of spur.

is this what you would do if cannot get it on its own circuit? Or would you just spur off with 4mm and take that direct to a garage cy without the 13a FCU?

 

[Octopus]

You do what is safe!

 

[TJ Anderson]

Hi,

i went ent to look at a job this morning where someone needs power to a remote garage in the garden, it's only about 8 - 10 meters away from back of house.

unfortunately it's not really feasible to run it on its own circuit for quite a few reasons, yet this would have been my preferred method.

is the general accepted method when coming off a ring to essentially create a lollipop circuit, so connect from ring to SWA back to small garage cy, is the accepted method just put a 13A FCU off the ring and run a bit of 2.5 swa to a garage cu?

obviously I'll check the zs and R1+R2 at point of spurring to calculate max length of spur.

is this what you would do if cannot get it on its own circuit? Or would you just spur off with 4mm and take that direct to a garage cy without the 13a FCU?

You are an apprenticed sparks aren't you?????

 

[uksparks]

You do what is safe!

Obviously, I was just wondering what most people do. Usually where it can't be run on its own circuit, I just take it through a fcu, but just wondered if I'm missing a trick.

 

[Octopus]

I saw an installation once where the downstairs socket circuit had been "extended" to an out building. Not ideal!

 

[uksparks]

No it's not ideal, I certainly wouldn't do that. This one would be s right pain to get s new circuit in maky due to the route the cable would take, and there is a cost issue as I know that option is going to be too expensive, but to run it off the back wall through a fcu would work well, I guess if it was switched it could be used as s point of isolation for the garage. They only want to plug s sodding tumble dryer in, I think I'd be more enclined to find space in the house for it.

 

[turnitonagain]

no problem with 2.5 swa, providing loop is good ie. ze +r1+r2. and the ring circuit has rcd protection. only issue would be pain in the butt tripping of the rcd if the garage is liable to damp and moisture. [nuisance tripping] and you are protecting the spur with a fso.

 

[uksparks]

Is that the option you would take if not a dedicated circuit?

 

[SPARTYKUS]

Hi,

i went ent to look at a job this morning where someone needs power to a remote garage in the garden, it's only about 8 - 10 meters away from back of house.

unfortunately it's not really feasible to run it on its own circuit for quite a few reasons, yet this would have been my preferred method.

is the general accepted method when coming off a ring to essentially create a lollipop circuit, so connect from ring to SWA back to small garage cy, is the accepted method just put a 13A FCU off the ring and run a bit of 2.5 swa to a garage cu?

obviously I'll check the zs and R1+R2 at point of spurring to calculate max length of spur.

is this what you would do if cannot get it on its own circuit? Or would you just spur off with 4mm and take that direct to a garage cy without the 13a FCU?

As Murdoch said, do what is safe. It is entirely up to you, you are the artificer of this, no one else.


I would at the very least have it through a double pole fused spur but far from ideal, but often things are.

 

[turnitonagain]

why not? there is nothing bad about taking a fused spur from a ring main if the other option is too difficult. before you run the spur, measure the phase and earth resistance of the swa [easy done if you know the length of run, the phase will be the same as the earth in swa] you can check the values in the ie regs also. then add to the loop impedance of the ring main, which will include Ze, and bobs your uncle if your values are within the limits given in the ie regs. as you know when you plug in your loop impedance meter it calculates the entire loop back to the supply traffo.

 

[uksparks]

As Murdoch said, do what is safe. It is entirely up to you, you are the artificer of this, no one else.


I would at the very least have it through a double pole fused spur but far from ideal, but often things are.

i only ever use DP fcu's and sockets, I think I'll just put a fcu in, probably be the best option.

 

[uksparks]

why not? there is nothing bad about taking a fused spur from a ring main if the other option is too difficult. before you run the spur, measure the phase and earth resistance of the swa [easy done if you know the length of run, the phase will be the same as the earth in swa] you can check the values in the ie regs also. then add to the loop impedance of the ring main, which will include Ze, and bobs your uncle if your values are within the limits given in the ie regs. as you know when you plug in your loop impedance meter it calculates the entire loop back to the supply traffo.

I'll do him a quote based on this route and if he accepts I'll pop round and take a couple of measurements.

Like i say I usually just fuse it down and run it from there, it's a shame I can't run it all the way back to the CU, unfortunately thete are too many obstacles and obstructions let alone a Tarmac driveway and steps up to the front of the house in the way.

 

[trev]

So you're going to quote on the basis of a wet finger in the air and then take some measurements?
Good grief! Quote on the basis of what you know, do it properly because that way nothing can come back and bite you on the arse.
Quotes are binding, estimates are not.

 

[uksparks]

I mean estimate not quote, it says estimate on the top, I usually put that it's based on certain things and discuss it with them.

 

[SPARTYKUS]

Tarmac's easy to fetch off and then repair.