Wiring a shed

[wuldiba]

just moved in to my new house and I have 2 sheds right next to one another. both sheds are 15 metres away and have double sockets in both of them, one shed running a tumble dryer (3kw)and the other one used for hand tools. I found that the supply cable was 2.5mm pvc on a 16amp breaker on the rcd side of my cu......so naturally I am replacing the main cable with 4mm swa. Im planning to terminate my swa on the non rcd side of my cu with a 32a breaker and have a small rcd 63 /30mA cu with 2 cb slots in the shed with two 16a breakers each feeding both sheds / sockets via 2.5 mm swa.....
My questions is would i just be aswell feeding from the rcd side of my cu and foregoing the shed rcd (as i dont want 2rcd's in line / discrimination et all)
I know about problems with taking house earth outside and am considering a spike............

all comments gratefully recieved

P.s......I did my electrical apprenticeship about 15 years ago and have been driving trains for the last 12, (so a little rusty)so I will be getting my mate who is part b registered (used to be my apprentice) to go over my work when he gets back from florida. I just want to make a start......thanks

 

[Taylortwocities]

This may answer many of your questions - including exporting the earth from the house. http://www2.theiet.org/Publish/Wire...matters_electrical_installations_outdoors.pdf

Note the article was written in 16th edition days. Some things have now changed.

I'm also interested in the "Part B registration". That's very novel!

 

[ban-all-sheds]

My questions is would i just be aswell feeding from the rcd side of my cu and foregoing the shed rcd (as i dont want 2rcd's in line / discrimination et all)

I always think not - if the RCD trips you lose the lights in the shed, which might be unfortunate if you're holding a thing with sharp stabby whirling bits, and probably be inconvenient to trek back to the house to reset. Or if you're in the house and something damp & leaky in the shed trips the RCD you have to go out there to sort it out.

The SWA itself doesn't need RCD protection, so stick to your original plan.

I know about problems with taking house earth outside and am considering a spike............

Have you got a PME supply and extraneous-conductive-parts in the sheds?

P.s......I did my electrical apprenticeship about 15 years ago and have been driving trains for the last 12, (so a little rusty)

Acca! - I thought you lived in Cornwall..

so I will be getting my mate who is part b registered (used to be my apprentice) to go over my work when he gets back from florida. I just want to make a start......thanks

No Part P where you are...

 

[wuldiba]

I know theres no part b but We have a very similar scheme up here in scotland and just said "part p" for simplicity..........sorry for confusion.