earth stakes for seperate buildings

[RJS Contracts]

Have been asked to quote for a supply out to a small garden room and then on to a greenhouse. Obviously am going to put small consumer unit in garden room to supply sockets but do I need another one in the greenhouse and as these are 2 separate buildings from the house do they need separate earth stakes or can I used a cpc from the house.

 

[Guest123]

What earthing system is present in the house???

 

[bugsy]

both outside the zone of the house so I would install C.U . to each and spike each

 

[RJS Contracts]

What earthing system is present in the house???

TNCS system

 

[Guest123]

Well ok as it is to export TN-C-S, in this instance I would convert both buildings to TT systems with a small CU in each.

 

[RJS Contracts]

cheers guys Circuit will be protected by rcd in house so just main switch needed in outbuildings??

 

[Deleted member 9648]

Well ok as it is to export TN-C-S, in this instance I would convert both buildings to TT systems with a small CU in each.

WHY??...as long as there are no other services in the buildings which would neccessitate running a separate main bond back to the MET just what is the point in not using a cpc from the TNCS house and making extra work adding earth stakes??.....Do you individually stake external lights and sockets etc fed from the TNCS supply??

 

[Guest123]

Look, I'm more than fuilly conversant of all the requirements regarding exporting PME. We dont know enough about the OP's set up to make a final judgement in this instance it's all if's but's and maybe's.

Distances, sizes, overhead/underground, demands, services, steel framed greenhouse???? sub-main off a sub-main etc etc.

 

[RJS Contracts]

Circuit was going to be fused down off ring main, run along garden fence about 10m in 2.5mm 3 core swa.

1 double skt in garden room and 1 double socket in greenhouse.

Greenhouse is steel framed!

 

[Deleted member 9648]

Ok..apologies...perhaps a little hasty....agree if steel framed it would likely be better to TT rather than run a main bond back to the MET. But in the case of no bonding required I'd leave it as a tncs and save time and money not having to run stakes out.....Lenny did point out that TNCS could be used ,but there seems to be a constant stream of threads on here insisting that anything outside the zone has to be staked.