Garden Wiring

[skamuk]

That thing still has a fuse in it which will need replacing when it blows! Why can you not run new circuits out of the main cu?

I can, I just don't want to. Its running the cable from the front to the back of the house from the CU. All cable would have to be hidden in the walls, no conduit or anything like that. Cant pull up laminate flooring and kitchen floor tiles to bury it under the floorboards, so It's kind of my only option.

So if this has a fuse... What is the reason for its existence? Once it blows you can't reset it? I assumed the fuse was there as a backup if the rcd failed?

 

[rmc86uk]

I'll end up running an extension lead in a bin bag at this rate!

This actually made me laugh out loud! I've seen this many times before probably along with other forum members to!


Sent from my GT-I9300 using Tapatalk 2

 

[brightspark26]

What I've seen before is a fcu in the house off the ring with a 2.5t+e then from there a swa 2.5 3 core to a shed which then goes to 2 fcu 1 for single socket on decking and 1 for decking lights. The ring was supplied from a 17th edition dual RCD consumer unit. The only reason the 2 fcu were fitted in the shed for isolation and the lighting had a 3a fuse in it

 

[ackbarthestar]

Reading this thread it appears that the Garden 'extension' wiring is going to end up as a Pigs ear. If you add spurs on spurs with, no doubt, T&E running all over the place.

IMO I would strip out the existing garden wiring, leaving the outside socket connected to the rfc and run a separate sub mains supply to the Garden shed. This leave you with all the design considerations associated with circuits. Something to consider as you do your electrical course at college and will give you greater impetus to learn all the basic design rules as you go.
You've got a great opportunity to get it right. Look forward to hearing about the outcome....

 

[Thefailsafe2012]

So if this has a fuse... What is the reason for its existence? Once it blows you can't reset it? I assumed the fuse was there as a backup if the rcd failed?

In your case say you we're going to run a lighting circuit off that RCD Spur, you'd fuse it accordingly say for example with a 3A fuse, it also has the RCD function so you are also protecting people from stray shears, pitchforks etc. It's a device used where you would have to meet the requirements of having RCD protected circuits where there is no main RCD so to speak. Similarly you can get IP rated RCD sockets too

 

[brightspark26]

The way I see it is you take a spur of a ring as long as you take your shed wiring from the load side it will only ever be rated to 13a from the fcu at the house. I see no harm in fitting fcu's in the shed for a light etc

 

[nikmet]

No harm.....apart from may be some nuisance tripping of the 13A fuse due to heater load etc?

 

[ackbarthestar]

The way I see it is you take a spur of a ring as long as you take your shed wiring from the load side it will only ever be rated to 13a from the fcu at the house. I see no harm in fitting fcu's in the shed for a light etc

But did you take into account the swimming pool pump, hot tub, Ark welder, HID flood lights that will be installed after the granny flat is completed in the upper floor of the shed?

 

[brightspark26]

I say it's ok as long as the load of the light etc will not be higher than 13a. Socket used for the lawn mower etc only and the light in the shed Is 60w etc

 

[brightspark26]

Let's get back to the real world. It's got RCD protection at the cu, it's fused to 13a. I fcu for the light. 1 fcu to feed a single socket outside(fcu just for isolation so socket not live all the time). If they want to plug extensions into the single socket then the fuse will pop

 

[skamuk]

In your case say you we're going to run a lighting circuit off that RCD Spur, you'd fuse it accordingly say for example with a 3A fuse, it also has the RCD function so you are also protecting people from stray shears, pitchforks etc. It's a device used where you would have to meet the requirements of having RCD protected circuits where there is no main RCD so to speak. Similarly you can get IP rated RCD sockets too

Oh ok I understand. So thats unnecessary as the ring circuit is already protected. So I think i'm going to install an 13a FCU In the shed and run everything off of that, making sure that I limit the amount of accessories installed, enough to not blow the fuse when everything is switched on at once. I can't really do much better than that with the money and circumstances put in front of me.

Once I have qualified to level 3 c&g and nvq, part p ect, i will most likely rip out this whole setup and replace it correctly just for peace of mind (and to keep everyone on here happy ) But at the moment this will have to do.

Thanks everyone for your help and opinions. I learned a lot!

 

[skamuk]

But did you take into account the swimming pool pump, hot tub, Ark welder, HID flood lights that will be installed after the granny flat is completed in the upper floor of the shed?

hahaha

 

[pvinstall]

Supply new CU with 4mm armoured on a 32A mcb from the CU in house. Install circuits with 30ma RCD protection as a new installation. Cant go wrong and
install will be protected from faults at both ends of supply cable. Singles in conduit is a good idea for the outside work as protection from external influences, rodents etc. If in doubt design it out is the motto to live by.

 

[Octopus]

Supply new CU with 4mm armoured on a 32A mcb from the CU in house. Install circuits with 30ma RCD protection as a new installation. Cant go wrong and install will be protected from faults at both ends of supply cable.

Not ideal as you'd have 2 x 30mA RCD's in series

 

[Guest55]

Supply new CU with 4mm armoured on a 32A mcb from the CU in house. Install circuits with 30ma RCD protection as a new installation. Cant go wrong and
install will be protected from faults at both ends of supply cable. Singles in conduit is a good idea for the outside work as protection from external influences, rodents etc. If in doubt design it out is the motto to live by.

so when a light in the shed goes kaput it takes out 4 circuits in the house dual rcd board instead of just 1 circuit in the shed.
great design lol
;-)

 

[jase]

But he's decent enough to do me a favour as a friend. Why can't anyone help? Rather than criticise??! I'll end up running an extension lead in a bin bag at this rate!

If he's decent enough to give you a cert , why isn't he decent enough to tell you how to do it? What has he said you should do?

 

[Octopus]

If he's decent enough to give you a cert , why isn't he decent enough to tell you how to do it? What has he said you should do?

Because he doesn't exist.

 

[skamuk]

Because he doesn't exist.

 

[skamuk]

It's all too late. Yesterday I installed the 2 sockets at the end of the garden. I ran 27m total of 2.5mm2 SWA from the 13a FCU i installed in the shed using 2.5 t+e, from the existing supply. The lights are to be installed in the near future.. I'll upload some pics of my nice and tidy (first) job soon!

 

[Thefailsafe2012]

It's all too late. Yesterday I installed the 2 sockets at the end of the garden. I ran 27m total of 2.5mm2 SWA from the 13a FCU i installed in the shed using 2.5 t+e, from the existing supply. The lights are to be installed in the near future.. I'll upload some pics of my nice and tidy (first) job soon!

i'm telling......

 

[SYKRAPS]

i'm telling......

Grass lol

 

[skamuk]

Grass lol

lol Agreed!

 

[skamuk]

i'm telling......

As you wish.. But I will find you :gunsmilie: