Discuss Multiple TT outbuildings in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:   American Electrical Advice Forum

sam400

-
Arms
Reaction score
168
Just after people opinions on this.

I ve just finished installing a kiosk which supplies 3 buildings,
The DNO was not clear on the earthing system they would be providing, in case I ended up with PME I earthed the submain armouring only at the kiosk
(2 core SWA) and isolated it at the load end with a stuffing gland into metal clad board. Earthing was provided for locally at each outbuilding with a rod - readings all good.

When the DNO turned up they fitted a cut out with earth bar on the side PME style but said I couldn’t use it because of high network ELI. No problem I fitted a 100mA types S after meter to provide earth fault protection on my submains.

Everything’s up and running but now wish I’d use standard SWA glands to tie all the earthing together and put all the rods in parallel.

I am pretty sure it’s compliant as is but am tempted to fit the glands all tho it won’t be fun.

Whats the general concensus?

Cheers
 
Thanks Davesparks,

Can you expand on the CPC sizing?

Are you saying that to have built in redundancy the CPC has to be sized to act as another buildings earthing conductor?

Or that the CPCs impedance has to be low enough to contribute positively to that buildings earthing?

Cheers
 
Hi - agree with Dave, it's an improvement to join the outbuilding rods. This may only practical if the outbuildings are fed from the first TT building, which it sounds like what's been done (?).
 
It’s fed from a kiosk 3 x submains, 3 x buildings.
To connect it all together I have just got to swap the compression glands for SWA glands
 
100A 3 phase supply. 2c x 50mm and 2c x 35mm submain.

I prob will change it as it will bug me. Although it’s compliant it could be better
I just wanted to see what others thought.

Thanks
 
Sounds ok. Whats your main cu set up? Type S rcd then bs88 fuses on submains & main switch rcd 30mA inbuildings? Have you bonded in building to steel frame?
 
Personally I would never use a stuffing gland on an SWA. I would have made them off into plastic boxes.

But in your scenario I would not change anytjing so long as Ze is acceptable.
 

Reply to Multiple TT outbuildings in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc
This website was designed, optimised and is hosted by Untold Media. Operating under the name Untold Media since 2001.
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock