Extraneous conductive bits & pieces

[cliffed]

metallic portacabin used for offices,Swa is on a steel caternary,enters office to Rcd DB.
No separation of swa earth Tncs @ cabin.
I want to Tt it,what’s your thinking of caternary wire,it comes from building to cabin.
Will this still import Tncs,& will it also need isolation from cabin,where it’s fixed,obviously to the steel cabin.

 

[Ian1981]

Despite the cabin being metallic does it actually introduce an earth potential into the installation or are you just being cautious?
Will this fall under section 704?
Is this a construction site as administrative offices,toilets and canteens are not in the scope of section 704 and only the relevant parts 1-6 of bs7671 need to be applied

 

[cliffed]

Agree,worried about the Main bonding conductors,the size is 50 mm.
This Swa will not provide that to the cabin.
The cabin is external,it’s a new cabin on a recycling plant.
Thanks.

 

[Yozza19]

I would tt it to be honest better safe than sorry also I wouldn’t be to worried about catenary wire if it is fixed to anything other than metal the supply side

 

[cliffed]

Thanks the caternary also fixed to metal @ cabin too.

 

[Pete999]

Thanks the caternary also fixed to metal @ cabin too.

Then in effect it becomes part of the cabin doesn't it?

 

[cliffed]

Yes,if tt system used,will it import Tncs from the metalclad building,of the structure,which will be bonded to the Tncs system.
Will the caternary need to be isolated or ignore