Submain, RCD protection.

[Chris86]

Good morning All,

Sorry for posting another sub main question but i have searched various posts and cannot find a definate answer.

I need to install a submain out to a brick built outbuilding which will be used for injured/unwanted ferret rehab. Building has no extraneous conductive parts and main supply is pme.

My plan is 32A rcbo in house consumer unit, 9 metre run of 6mm t&e through floor joists to galv box on outside wall. 6mm 3 core SWA from galv box to outbuilding 11 metre run buried under footpath and them fixed to garden wall. 2 way CU in outbuilding with main switch, 16A supply for sockets and 6A supply for lights. All in galv conduit to make it ferret proof.

My question is, would i be better off having an mcb at the house end and rcd main switch in the sub board? I feel the submain cables would be better having rcd protection but as i can comply with greater than 50mm deep at all points, i am starting to doubt my plan. Any thoughts?

ATB

Chris

 

[Octopus]

There is no need for RCD protection for SWA in the case you outline BUT why are you messing around with T&E and SWA - just do the whole run in SWA.

Have you checked with your scheme to see what they say?

 

[Strima]

Whole run in SWA then MCB at the supply end.

 

[Chris86]

Thank you for your input.

Using the t&e would just make the internal run a dam sight easier but full run of SWA is more than possible.

I am not a member of a scheme, job is part of a full rewire which will be notified to Birmingham council buildings control if they decide my current qualifications do not seem me competent, something they are reviewing as we speak.

ATB

Chris

 

[Octopus]

I would avoid any extra joints whenever possible - so as a rewire surely this is the way to go.

As for a scheme, why don't you join Stroma? At £288 it would make you life a whole lot easier ........

 

[Spoon]

I'm with the above. Just do the full run in SWA.

 

[Gavin John Hyde]

Also depending on consumer unit location in house and layout it is sometimes easier to run the swa out the and around house rather than lifting floorboards cutting joists etc.. All job specific and would have to calculate the voltage drop and cost verses time to do alternative options.

 

[Chris86]

SWA all the way it is then, unnecessary joints should be avoided, I appreciate that so will go with the full SWA run.

I would happily join a scheme but I dont have 2391 inspection and test which is holding me back. I would love to do the course but working shifts means finding a course difficult.

ATB

Chris

 

[telectrix]

afaik, you don't need 2391 to join a scam.

 

[Spoon]

afaik, you don't need 2391 to join a scam.

I have a 25 meter swimming cert... Can I join a scam?

 

[SparkyChick]

As @telectrix says, I don't believe you need 2391 or 2394/2395 to join a scheme unless you're planning on registering as an inspector with them (this is based on my experience with NAPIT).

 

[telectrix]

I have a 25 meter swimming cert... Can I join a scam?

beat you. i have a 50 yard swimming cert. obtained when meters were something you put shillings in.

 

[PEG]

Hi,be mindful of the earthing arrangement,and ferret wee will sort out the best of galvanised conduit

 

[PEG]

As @telectrix says, I don't believe you need 2391 or 2394/2395 to join a scheme unless you're planning on registering as an inspector with them (this is based on my experience with NAPIT).

This was the reason for my "optimistic",on Tels post...the schemes used to make you cross your fingers and promise to think about maybe trying,for the T&I,but not applying anything which could be cheque-stopping

 

[Pete E]

Good morning All,

Sorry for posting another sub main question but i have searched various posts and cannot find a definate answer.

I need to install a submain out to a brick built outbuilding which will be used for injured/unwanted ferret rehab. Building has no extraneous conductive parts and main supply is pme.

My plan is 32A rcbo in house consumer unit, 9 metre run of 6mm t&e through floor joists to galv box on outside wall. 6mm 3 core SWA from galv box to outbuilding 11 metre run buried under footpath and them fixed to garden wall. 2 way CU in outbuilding with main switch, 16A supply for sockets and 6A supply for lights. All in galv conduit to make it ferret proof.

My question is, would i be better off having an mcb at the house end and rcd main switch in the sub board? I feel the submain cables would be better having rcd protection but as i can comply with greater than 50mm deep at all points, i am starting to doubt my plan. Any thoughts?

ATB

Chris

Sounds an interesting project! How are you housing the ferrets inside the shed?

Where I used to live a chap run a small boarding kennels and the internal housing was a couple of those precast concrete "garages" that used to be popular.

What he did for electrics was have all his internal wiring in exterior grade weather/waterproof fittings sockets, lighting ect with all the sockets mounted high up on the wall around the six foot mark as I recall...

I have no idea whether such an install would meet the regs today, but I think he did it it to keep the electrics as far a way as possible from the dogs and also because he was for ever mopping out the floors and lower walls ect...

 

[DPG]

18th Regs, Special locations, Locations which contain (or may forseeably contain) tubular animals or similar.

 

[Risteard]

Whole run in SWA then MCB at the supply end.

A fuse would be better.

 

[Midwest]

This was the reason for my "optimistic",on Tels post...the schemes used to make you cross your fingers and promise to think about maybe trying,for the T&I,but not applying anything which could be cheque-stopping

I think most of the CPS's require some sort of acceptable electrical qualification. At my first assessment, the assessor wasn't interested in my boy scout awards for whittling and/or lying, but was keen to have a look at my dusty apprenticeship indentures and wax seal.

OP, give one of those schemes a bell and ask. All I would say, when I decided it might be a fun idea, and do some sparkying in my semi-retirement, I went and did a 2391. Money well spent, as I never previously seen any test equipment, other than a Drummond Test Lamp.

 

[Chris86]

Thanks to all for your advice and input. All this talk of schemes has got me thinking. It may be worth a go, who knows what the future holds and maintenance in the motor industry isn't exactly secure at the moment. I will definately be looking to do the 2391 this year if a can find a way of working it round family and shifts.

With regards to the housing of the ferrets, they plan to have 2 indoor bed areas within the outbuilding with holes knocked through to outdoor runs. There will also be an indoor pen with a covered play pen style run and them some smaller hutches to act as sick bays. The sockets will mostly be located by the hutches for running heat lamps/beds (max 2) . No sockets will be located within any of the actual pens. They have certainly thought the layout through and know exactly what they need.

Thanks again.

Chris

 

[Midwest]

Thanks to all for your advice and input. All this talk of schemes has got me thinking. It may be worth a go, who knows what the future holds and maintenance in the motor industry isn't exactly secure at the moment. I will definately be looking to do the 2391 this year if a can find a way of working it round family and shifts.
Chris

Bizarre, that's exactly what caused me to quit the industry in 1984.