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

 

[GLENNSPARK]

ooo i was using 32amps as my design current for voltage drop

the consumer unit at the front of the house on an inside wall so im not sure if theres a way to get the cable back to it.

no...13A...as i told you...

 

[Robson689]

really it should be 6mm swa to the shed from the consumer unit and a seperate earth rod?

Do the volt drop calculations and see. I don't know about the earth rod though.

 

[telectrix]

why a separate earth rod. take the main earth to shed. don't let's re-open this discussion again or i'll be out with archie.

 

[stuartcourt]

here we go again why do you need earth rod

 

[stuartcourt]

no like button telectrix but if it did .........

 

[chris222]

Let him do it his way he the boss let us know what the earth loop inmepence is after after all,it's a learning curb for you

 

[GLENNSPARK]

not sure but i doubt h'ill use more than 2.5

perry....stop conjecturing....do your VD calcs as i asked you to....i have given you all you need...
you know your length of run....
you know what your Ib is
now check the mV/A/m in app f OSG...
work it out...no guessing please

 

[stuartcourt]

do I take it you are going to a garage board

 

[Edd]

He most likely just wants a light in his shed.. let install a 6 mm SWA from the CU stick a rod in, dig up the garden, wreck the house, just so the poor sod can see his potting plants...
Spur off ring, 4mm radial SWA. make sure RCD protected. let him pot the plants...
Now if its a work shop down there, well!!!!!!!!!! thats a diffrent storey

 

[GLENNSPARK]

He most likely just wants a light in his shed.. let install a 6 mm SWA from the CU stick a rod in, dig up the garden, wreck the house, just so the poor sod can see his potting plants...
Spur off ring, 4mm radial SWA. make sure RCD protected. let him pot the plants...
Now if its a work shop down there, well!!!!!!!!!! thats a diffrent storey

only thing is Edd....once he`s got light in there....wont be long before he`s regretting not having an outlet in there n all.....
give him some light..and he`l be up late at night.....
wirin up a dodgy socket outlet...lol...

 

[perry_bridges]

the volt drop is under the limit

 

[telectrix]

not if he has lighting in there, it ain't. ( 18 x 13 x 45 )/1000 = 10.53V.

 

[GLENNSPARK]

the volt drop is under the limit

perry....whats your max percentages of VD for lighting and power?

 

[Toonlad]

perry....stop conjecturing....do your VD calcs as i asked you to....i have given you all you need...
you know your length of run....
you know what your Ib is
now check the mV/A/m in app f OSG...
work it out...no guessing please

the volt drop is under the limit

What was Glenns last 3 words of his sentence, and he was very polite too.

 

[stuartcourt]

tell us if your finding it a problem you are an apprentice its ok