Shed supply

[craig1000]

Thoughts please?

Shed supply spurred off ring in house, ring is RCD protected.
SWA glanded into AD box outside back entry through wall into socket!
At the moment SWA feed just a twin socket, but customer would like a small CU put in with a few sockets & couple of lights.
Although i would like to see it have its own supply from CU the cost & practicality's of it would be difficult.
I cant see anything wrong with the existing supply being used, its a 3c 4mm SWA.
Dont want to try to make the customer go for a dearer option unless i can justify it on safety/regs grounds that its not acceptable as it is.

 

[Octopus]

Personally I'd always have an isolation point between an existing socket and the "shed" supply rather than straight into the back of a socket.

 

[Steve_P]

Personally I'd always have an isolation point between an existing socket and the "shed" supply rather than straight into the back of a socket.

Totally agree.

 

[Deleted member 9648]

Personally I'd always have an isolation point between an existing socket and the "shed" supply rather than straight into the back of a socket.

Me too....load allowing bung an FCU next to the socket in the house......there is also the issue of load on a spur feeding a CU if you dont fuse it down,technically you could overload it ,and it wouldnt comply with the general requirements for a spur in app 15. ("an unfused spur should feed one single or one twin socket outlet only")

 

[Silly Sausage]

At the house end, take the SWA off a DP 13A FCU on the ring.
At the shed end, SWA into a DP switch, then through sockets to a 3A FCU, then on to the lights.

 

[Guitarist]

At the house end, take the SWA off a DP 13A FCU on the ring.
At the shed end, SWA into a DP switch, then through sockets to a 3A FCU, then on to the lights.

In this instance I think this is the best solution. If you use metal-clad either end, then earthing your armour is sorted without having to go through adaptable boxes.

 

[Octopus]

Looks like, for once, we all agree on the best solution.

Should we start to rewrite BS7671 to suit our common sense approach??

lol

 

[Deleted member 9648]

Looks like, for once, we all agree on the best solution.

Should we start to rewrite BS7671 to suit our common sense approach??

lol

Last thing we need now is someone to mention exporting the earth............DOH!!

 

[Guitarist]

Last thing we need now is someone to mention exporting the earth............DOH!!

Don't you mean "extending" ?.........oops!

 

[craig1000]

hey thanks for your thoughts everyone, all posts noted & taken in & pretty much as i thought but wanted to double check, il be telling the customer & pricing for things to be done as per the general consensus of the post !

 

[Octopus]

For what its worth if a client wants sockets and lights in a shed I'll quote them for a 2 way CU

 

[nickblake]

Looks like, for once, we all agree on the best solution.

Should we start to rewrite BS7671 to suit our common sense approach??

lol

that would be an A4 page then with an on site buisness card

 

[craig1000]

Hey everyone, been reading up on the exporting earth situation & to be honest as something yet im not to have encountered previously (coming from a commercial install sprk background) id like to clarify the matter. It is a TN-C-S supply so therefore i am guessing i should be putting in its own earth rod & just use the phase & neutral & not connect the cpc the shed end just use it as a monitoring cable effectively to protect it via the house supply in the event of a fault on the supply going out the the shed but not for the install within the shed?
Surely the Zs reading will be far better & a far better earth path via the TN-C-S than the rod bearing in mind the built up environment the location is.
Sorry to seem a bit clueless, but as per alot of my posts recently i have just moved into domestic &its a minefield of things i didnt need to look at before. I am trying to learn more & take it all in but my mind is currently going into overload with it all lol!

 

[Silly Sausage]

No, you do not need an earth rod!
If there any extraneous parts, they'll need bonding back to the MET in 10mm.

 

[Engineer54]

No, you do not need an earth rod!
If there any extraneous parts, they'll need bonding back to the MET in 10mm.

I was going to refer the OP to the Sticky covering this subject, ...But it seems as if this long running sticky has disappeared????

 

[craig1000]

ok so no extraneous parts i.e wooden shed, just normal use sockets n lights will be ok
If it was a metal shed or container then 10mm(or bigger if conductor size was larger) back to MET, if this was not practical then resort to earth rod!

 

[Tonkatoy27]

Change outdoor adaptable box for IP rated fcu (or an indoor fcu in an IP encosure)

terminate swa into metal clad twin socket (or adaptable box then on to plastic sockets)

Couple metal clad socket to metal clad fcu for lights

simples.

(unless max demand in shed is more than 13amps, then it'll have to get more expensive)

 

[Guitarist]

ok so no extraneous parts i.e wooden shed, just normal use sockets n lights will be ok
If it was a metal shed or container then 10mm(or bigger if conductor size was larger) back to MET, if this was not practical then resort to earth rod!

Basically, yes.