Would this be acceptable?

[perry_bridges]

Hi all,im currently an Apprentice and need some advice for a job that my boss is doing.He plans to put a fused spur on a 32a ring circuit to feed a CSU for a couple of sockets in the shed. The cable run is about 45 meters long using SWA (not sure what size).Is this acceptable because this doesn't seem right to me?cheers perry

 

[ackbarthestar]

Well it would work up to a point as long as the load wasn't greater than 13A. It appears to be a cheap temporary solution.

What is the earthing arrangements for this installation?

 

[GLENNSPARK]

what do you think isn`t right about it?
answers here please...before we say anything else

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Well it would work up to a point as long as the load wasn't greater than 13A. It appears to be a cheap temporary solution.

What is the earthing arrangements for this installation?

let him think about it....

 

[ackbarthestar]

@Glenn, I shall take the advice of an old hand on this one.......

 

[Octopus]

I think you should talk this through with your boss. Asking questions is THE best way to learn on the job.

 

[GLENNSPARK]

@Glenn, I shall take the advice of an old hand on this one.......

its just that theres too many coming in wanting quick answers....not today...please..

 

[GLENNSPARK]

what are your own thoughts on this arrangement your Boss has proposed perry?

 

[perry_bridges]

i know the maximum current would only be 13 but its the length thats getting me because i know the maximum of a ring final circuit is 100 meters squared and im not sure about if theres a maximum length for a fused spur?

the earth i think its TN-S at the incoming.

 

[Adam W]

to feed a CSU for a couple of sockets in the shed.

Sorry what is this 'CSU'?
Spurring off a ring final is a pretty standard way of providing power to a shed - the 13A fuse ensures you can only draw a maximum of 13A from the ring final.
I'm just waiting for the 'exporting an earth to an outbuilding' debate to rear it's head...

 

[GLENNSPARK]

Sorry what is this 'CSU'?
Spurring off a ring final is a pretty standard way of providing power to a shed - the 13A fuse ensures you can only draw a maximum of 13A from the ring final.
I'm just waiting for the 'exporting an earth to an outbuilding' debate to rear it's head...

hmm....now, theres a thought....

 

[telectrix]

i'd be more concerned with loop impedance and volt drop if the SWA is anything under 6mm.

 

[GLENNSPARK]

perry....use your In of the fuse as your Ib....calculate VD off ov that....

 

[Adam W]

I've got a pdf guide on it here, just trying to figure out if and how I can post it.

Found a link to it:
http://electrical.------.org/wiring-matters/16/elect-inst-outdoors.cfm?type=pdf

 

[Guest55]

all that work andd cost to supply an out-building over 40 mtrs away with just 13A ?

and the chances of the shed Zs complying with the max value on the back of a ring main is close to nil.

its a crap idea to be honest.

 

[stuartcourt]

Does sound that way nave to say, is there a route to consumer from outside perry