shed wiring and electrics

[winston1]

Maybe it suits the "electrician" for the client to buy the parts. Might be the "electrician" cannot get credit at the trade counter and doesn't want to spend his own money up front in case he doesn't get paid ( because (s)he messed up the project ).

Another possible reason is to keep his turnover below the VAT threshold.

 

[winston1]

Deadbeat - take no notice of Winston - his ideas are rubbish.

Mind you - I guess we don't know if you were already planning the rubbish design of a shed CU supplied from a breaker in your house CU....

You may have your own ideas on the way to do things, but you have no right to call a perfectly legitimate method rubbish. Apology required.

 

[RF Lighting]

It was a rubbish idea.

 

[winston1]

It was a rubbish idea.

Why? Why is it a good idea to have a separate CU for an outbuilding, but not to have a separate CU for each floor or even each room?

 

[JohnW2]

It was a rubbish idea.

... and, particularly if the supply was derived via a house RCD, one which I'm sure some people would argue contravened 314.

Kind Regards, John

 

[JohnW2]

Why? Why is it a good idea to have a separate CU for an outbuilding, but not to have a separate CU for each floor or even each room?

It's not so much of an issue about the CU - but, rather, about RCD protection - and once one needs a separate RCD, a mini-CU is often/usually the easiest/best way of doing things. As I've just eluded to, there is already a regulation which most people interpret as meaning that there is a requirement for circuits (rooms, floors) to be spread across two or more RCDs. ... and, of course, circuits in an outhouse are probably more likely to result in RCD trips than most other circuits.

If you had, or engineered, a 3-RCD or 4-RCD CU for the house, then it probably would not be so bad an idea

Kind Regards, John

 

[stillp]

circuits in an outhouse are probably more likely to result in RCD trips than most other circuits.

Why?

 

[RF Lighting]

Damp

 

[JohnW2]

Damp

Quite so - if not frank liquid water (try my sheds if you don't believe me!)!

Kind Regards, John

 

[skotl]

The OP's question was asked and answered halfway down page one, yet we get another two pages of nonsense and pointless argument because winston and b-a-s want to use a DIY forum to boost their ego...

 

[DeadBeat]

Personally I would use a metal consumer unit in a shed as easier to fit the SWA gland into. These from Screwfix may need a RCD or RCBO adding but it seems you will latter be able to swap front plates to make them amendment 3 compliant and easy to fit a SWA gland into.

(here goes the disclaimer so hopefully i can get an answer) just to satisfy my curiosity and to perhaps learn somthing, as i wont be designing this.

I can see why you suggest a metal CU when fitting a CU in the shed, would it be possible instead to fix the armored cable in to an intermediate metal box before the CU which would take the strain of the cable, and then a small none armoured run from there to CU? or would this be bad practice, if so, why?

thanks

 

[bernardgreen]

Untitled

• bernardgreen
• 10 May 2009
• 17

Using the inner sheath of the SWA provides protection of the cores into the CU
( I should have fitted a grommet to the exit hole. )

 

[ban-all-sheds]

Untitled

• bernardgreen
• 10 May 2009
• 17

That's fine, but generally a way round the problem when there's already a plastic CU in place. Starting from scratch it would be better to avoid the problem by not installing a new plastic one.

[EDIT]
Doh! I knew there was a photo on the site somewhere, but of course it took me longer to find than it did the person who knew where it was....
[/EDIT]