Horse stable. would you TT or TN-S ?

1Justin · Feb 20, 2014

This is not quite “Agricultural and Horticultural”, - but has horses!
DNO supply to an outbuilding (just a craft room, no animals). TN-S at head.
This feeds metal clad barn containing horse(s). About 20M away.
No metal floor grids, no other metal other than the cladding and local CPC's from lighting/sockets.

Might you recommend TT the barn? or stick with the TN-S?- There is NO CHANCE of an underground SWA (too much concrete). Existing overhead catenary support can be re-used, (ex. installation is unsafe - I could go into why but not much point here).

Geordie Spark · Feb 21, 2014

Tony said:
Make it lower. I hate horses!

Not bad served with a good red wine sauce though.

You sound like a disgruntled failed betting man.

Geordie Spark · Feb 21, 2014

Horses are inherently stable due to their having a leg at each corner to balance their head.

Mum's Grandmother once borrowed the milkman's horse and cart ( this is absolutely true folks - and I kid you not ) because she was moving home from one street to another a couple of streets away.

So there they were with all the furniture loaded on the cart and they set off up the back lane.

The bloody horse stopped at every back gate all the way to the new home. It thought it was on its usual milk round.

1Justin · Feb 21, 2014

Hi Engineer.

No, DNO confirm it's not PME, had me going for a while, especially since PSSC and PEFC were nearly identical. Earthing conductor and neutral both emerge from the tape wrap at the cable head, but the N wires are individually laquered black, and the E is plain Cu conductors which indicates the latter isn't just part of the former. I still can't really measure much other than an almost short between N-E. I did send DNO a pic to confirm.

So if I did TN-S, that would be cheaper and quicker. I am considering running 6mm H07 rubber flex via the catenary, and would need to parallel up 10mm bonding conductor (to bond the steel skin of the stable).

Knobhead · Feb 21, 2014

Geordie Spark said:
Horses are inherently stable due to their having a leg at each corner to balance their head.

Mum's Grandmother once borrowed the milkman's horse and cart ( this is absolutely true folks - and I kid you not ) because she was moving home from one street to another a couple of streets away.

So there they were with all the furniture loaded on the cart and they set off up the back lane.

The bloody horse stopped at every back gate all the way to the new home. It thought it was on its usual milk round.

I can empathise with that, we borrowed the coal mans horse and cart to move dad’s shed. As you say, it stopped at every customer’s house. Walked straight past any house that wasn’t on his round.

Pity I’d no film for my old box camera, it looked comical with the shed intact on the cart.

PEG · Feb 21, 2014

...joining in with the horse stories,a lot of my friends and customers are equine related,and all i see is the size and direction of the money flow...if you have a daughter,put her on heroin before you put her on a horse...1) it's cheaper 2) it's easier to get her off than a horse...

GLENNSPARK · Feb 21, 2014

1Justin said:
Hi Engineer.

No, DNO confirm it's not PME, had me going for a while, especially since PSSC and PEFC were nearly identical. Earthing conductor and neutral both emerge from the tape wrap at the cable head, but the N wires are individually laquered black, and the E is plain Cu conductors which indicates the latter isn't just part of the former. I still can't really measure much other than an almost short between N-E. I did send DNO a pic to confirm.

So if I did TN-S, that would be cheaper and quicker. I am considering running 6mm H07 rubber flex via the catenary, and would need to parallel up 10mm bonding conductor (to bond the steel skin of the stable).

would not a proper visual & PEFC have not confirmed this as well?

saved us all a load of trouble...

GLENNSPARK · Feb 21, 2014

Engineer54 said:
So it's NOT a PME installation at all then, which i mistakenly took that it was!! The concentric cable you describe above is called a ''Split Concentric'' cable, used by the DNO for TN-S. If that's correct, then there would be no problem extending the equipotential zone to the stable.... It's only within a PME earthing system where it could cause problems for livestock!!

pork!!...

its pork......!!......

pork.....

GLENNSPARK · Feb 22, 2014

PEG said:
...joining in with the horse stories,a lot of my friends and customers are equine related,and all i see is the size and direction of the money flow...if you have a daughter,put her on heroin before you put her on a horse...1) it's cheaper 2) it's easier to get her off than a horse...

well..one of my ex workmates was equine related as well

they all looked like horses...

but i guess thats just the way it is......

1Justin · Feb 22, 2014

GLENNSPARK said:
would not a proper visual & PEFC have not confirmed this as well?

saved us all a load of trouble...

Hi Glenn, Ah but we must like this forum, so I can't save too much trouble and give it all away at once. Yes I did take photos and measurements early on (seals already missing and -careful- dismantling seemed to be the only option..).
It still wasn't clear to me immediately whether the E and N were separate. Very low resistance between them, (PEFC and PSSC very similar). But DNO say definitely no PME, it's confirmed as split concentric.
Let me know if you see otherwise. Thanks.