When is farm not a farm?

[Oli]

I’m working on a farm, except the barns I’m working in are not being used as agricultural barns, they are rented out for commercial business, workshops etc.
The barns are really one big barn and one CU distributes to all the smaller CU’s in the sub barns. 3 Phase.
The distribution board does not have an RCD , all the sub boards do but none of the distribution circuits have any RCD protection, they are all done with armoured cable, mostly cable tied onto the steel beams overhead.
Should this main board have a 300ma RCD or not?

Cheers for any help guys.

Oli

 

[Strima]

What is the earthing arrangement?

 

[Deleted member 26818]

Might be that the distribution circuits are fed from a TN-C-S supply and the DBs they are supplying are all TT?

 

[Oli]

TN-C-S, no seperate TT supplies, all from the one TN-C-S supply.

 

[Deleted member 26818]

Armoured cable doesn’t need RCD protection.

 

[Oli]

Armoured cable doesn’t need RCD protection.

Agreed, just wondered if being farm/commercial meant otherwise

 

[buzzlightyear]

The sub boards what are they feeding .

 

[streamer]

Armoured cable doesn’t need RCD protection.

That's generally true, however all circuits in an agricultural installation must be protected by 300 mA RCD.
It doesn't sound like it is an agricultural installation any more though.

 

[westward10]

The building has had a change of use and is no longer considered agricultural. In general 300ma rcds on agricultural sites are for fire protection which can be caused by arcing in dusty environments.

 

[westward10]

A dwelling on an agricultural site is not considered part of the special location and the same can be applied to this.

 

[Oli]

The sub boards are feeding, lights, sockets, roller shutters, car lifts and is about to have a kitchen builder who has three phase work tools, he might be making ---- loads of dust. I don't know if the zoning has been changed for all of the barn, it has for one section, but possibly the others may be still classified as agricultural, there is a honey maker in one of them for instance (not much dust there though)

 

[buzzlightyear]

Just read on the news 300 sheep dead ,all lining up to get on to pottery course..in barn conversion.Lol.

 

[Deleted member 26818]

I wonder how much cocaine they needed to be able to count that many?

 

[Spoon]

I wonder how much cocaine they needed to be able to count that many?

You could just take speed and count them in a quarter of the time..

 

[littlespark]

300 sheep??? I tried counting sheep once....

1....2.....3.... ZZzzzzz