Site cabin

[DT1991]

Does a site cabin for admin and canteen facilities fall under a construction site for BS7671

The cabin is designed to be onsite for a year.

 

[cliffed]

Cant remember what 704 is for? But surely other bits of BS7671 would apply.
[automerge]1585496978[/automerge]

Why, generally interested.

Cant remember what 704 is for? But surely other bits of BS7671 would apply.
[automerge]1585496978[/automerge]

Why, generally interested.

Mainly because of the problems of Sizing protective bonding conductors,relating to the Tncs earthing system.

 

[westward10]

Can you explain why the supply to the cabin will come under 704 when it is not on a construction or demolition site?

So this isn't a construction site.

 

[David Prosser]

So this isn't a construction site.

Most of our of site cabins are not within the construction site. They are keeped in a dedicated compound near to but not within the construction site.

 

[DT1991]

So this isn't a construction site.

What dave said best describes the set up.
Should of included that in first post sorry

 

[westward10]

I suspect the supply comes from the construction site hence it would be subject to Section 704.

 

[davesparks]

Can you explain why the supply to the cabin will come under 704 when it is not on a construction or demolition site?

The supply is likely to be common to both the construction site and the cabin, and so the DNO will not provide an earth and the supply will fall under construction site regulations.

 

[static zap]

Was it more about not using your power tools in an admin area ?

 

[westward10]

The supply is likely to be common to both the construction site and the cabin, and so the DNO will not provide an earth and the supply will fall under construction site regulations.

Not necessarily the case. I worked on four sites back in the summer testing the cabin supplies, two of them had TN-C-S supplies which were sealed and being used.

 

[davesparks]

Not necessarily the case. I worked on four sites back in the summer testing the cabin supplies, two of them had TN-C-S supplies which were sealed and being used.

That's why I said likely, not always.

I would imagine the majority of sites get only the one supply.

 

[David Prosser]

Site cabins for us will always come of our own distribution network. I can't remember any of them being TT.

 

[cliffed]

Site cabins for us will always come of our own distribution network. I can't remember any of them being TT.

That’s ok as long as main protective bonding conductors are sized correctly,to that network.
we always TT then bond accordingly usually 10 mm .

 

[robd]

I always tt cabins now and I've noticed the last few compounds the electricity board haven't given us the option of tncs as in they've not given us an earth terminal so they've made it pretty clear they want us to tt.

 

[cliffed]

I always tt cabins now and I've noticed the last few compounds the electricity board haven't given us the option of tncs as in they've not given us an earth terminal so they've made it pretty clear they want us to tt.

Agree, it’s the safest way to comply.