Shed feed from 2 FCU's

[matdom]

Just trying to sort out a quot for a customer...

he he wants a single socket and a light in his shed.
coming from th CU is a no go due to location.

he has told me he would like to use a small welding set from time to time which will pull pretty much 13amps so if I ran the socket and lights from one FCU out to the shed he would probably blow fuse when using welder and lights.

Have I overlooked anything in thinking I can just run 2 supplies out, one for socket and one for lights both fed from individual FCU's from downstairs ring (RCD protected)??

 

[davesparks]

If it's for a welder then the job needs doing properly with a submain from the CU.

 

[Lucien Nunes]

a small welding set from time to time which will pull pretty much 13amps

Welder loads are very spiky, they go from zero to overload and back to full load every time you strike the arc. Anything on the same final circuit is likely to be disturbed, it will make any lights on the ring inside the house flicker and possibly other side effects. As above separate circuit advisable or you will probably get complaints.

 

[Guest77]

Just trying to sort out a quot for a customer...

he he wants a single socket and a light in his shed.
coming from th CU is a no go due to location.

he has told me he would like to use a small welding set from time to time which will pull pretty much 13amps so if I ran the socket and lights from one FCU out to the shed he would probably blow fuse when using welder and lights.

Have I overlooked anything in thinking I can just run 2 supplies out, one for socket and one for lights both fed from individual FCU's from downstairs ring (RCD protected)??

Oh god yes, you have overlooked plenty on this job.

 

[matdom]

As already stated CU is a complete no go, he doesn't like any of the proposed cable routes.
I fully understand how welder operate etc,
if it's not done like this then he's ultimatey going to run an extension lead across the lawn and do it that way but he wanted a more permant option but I've never seen a shed powered from 2 independent FCU's so that got me thinking maybe there is a glaringly obvious reason as to why I haven't seen it that I may have over looked. I can't think of any regs that it wouldnt comply with.

 

[Octopus]

As already stated CU is a complete no go, he doesn't like any of the proposed cable roots.
I fully understand how welder operate etc,
if it's not done like this then he's ultimatey going to run an extension lead across the lawn and do it that way but he wanted a more permant option but I've never seen a shed powered from 2 independent FCU's so that got me thinking maybe there is a glaringly obvious reason as to why I haven't seen it that I may have over looked. I can't think of any regs that it wouldnt comply with.

Do it once, do it properly or walk away.

 

[amlu]

4mm armored cable supplied from a ring?
my mate has his small inverter welder, plugs it into a standard socket on a ring, it works no problem.

 

[matdom]

4mm armored cable supplied from a ring?
my mate has his small inverter welder, plugs it into a standard socket on a ring, it works no problem.

Well he uses it from home at the moment with no issues and like I said he is just going to use it on a crappy 1.5mm flex ext lead if he can't have anything more permanent, at least this way it would be installed neatly, properly protected and tested and inspected.

 

[trev]

If the guy isn't prepared to pay to have it done properly then you walk. Let some clown do a bodge job for peanuts and sort out the mess free of charge later.
Or the other potential side is the clown bodges it, causes all sorts of problems and you get the call to return and do it properly thus saving the day and earning massive amounts of brownie points along the way.
Either way you win.

 

[HandySparks]

I'd be surprised if the lighting load in a shed would be enough to turn an adequate supply into an inadequate one. Provided that it's just a couple of fluorescents rather than a bunch of 500W floods.

I'd put a single 13A supply in and see how it goes (with the proviso to the customer that it may need upgrading, depending on the characteristics of the welder).

 

[shanky887614]

let me guess, is the board in the middle of the house?

the idiots that built the house im in now put it in the dead centre of the house in the downstairs toilet, no way to easily add things in the future without lifting a lot of boards upstairs