Barn conversion

[simbin]

I've recently been approached to do the electrical installation on a barn conversion, no problem straight forward! The problem is getting a supply in. The owners want to have the mains coming from their cottage about 23 metres away. They don't want the driveway digging up for a new supply as its only just been block paved. Is there anyway of separating the supply in the cottage or do they need a site visit from electric supplier to determine whats required???

 

[bugsy]

Is this to be a seperate supply metered by client /DNO

 

[simbin]

Their not bothered about a separate meter (don't know why?), just a main supply.

 

[bugsy]

swa on cat wire between the two buildings easiest option

 

[simbin]

And the power comes from???? Split meter tails in henly block?! Surely 100A fuse can't supply two consumer units??? (cottage & barn)

 

[bugsy]

Henly block 63a switched fuse - calc the loads / diversity

 

[pennywise]

Depends what's going in the barn and how big it is

 

[simbin]

Its not too big-kitchen,lounge,one bedroom,bathroom. All electric, no gas. 3 panel heaters,hob, oven. SO.....25mm tails from isolator split in a henly block to feed consumer unit in cottage & metal clad switch fuse with swa on out going side is fine??

 

[pennywise]

Providing all calcs work out, should be fine, is the cottage a PME or TT supply?

 

[bugsy]

if you can post all the connected loads it would help

 

[simbin]

The cottage is PME. The following circuits to be installed; Shower (40A),Cooker(32A),Upstairs ring-8 points(32A),Downstairs ring-14 points(32A),Upstairs Lights-6 points(6A),Downstairs lights-6 points(6A),Smoke alarm-2 points(6A)

 

[pennywise]

Looks like your going to have to TT the barn.

 

[bugsy]

The cottage is PME. The following circuits to be installed; Shower (40A),Cooker(32A),Upstairs ring-8 points(32A),Downstairs ring-14 points(32A),Upstairs Lights-6 points(6A),Downstairs lights-6 points(6A),Smoke alarm-2 points(6A)

And the barn?

 

[simbin]

Those are the circuits for the barn. And pennywise, what do you mean 'have to TT barn'?

 

[pennywise]

Because you can't export the earth from house. You'll have to put in a rod for the barn.

 

[bugsy]

Those are the circuits for the barn. And pennywise, what do you mean 'have to TT barn'?

O.K. what are the connected loads in the cottage

 

[simbin]

The cottage contains; Shower(40A),Cooker(32A),Upstairs ring-13 points(32A),Downstairs ring-14 points(32A), Kitchen ring-8 points(32A),Lighting circuit-13 points(6A)

Just been looking at the forum, there's one on there about exporting earths......a mixed bag indeed! Who's right,who's wrong?!?!?

 

[pennywise]

I would say that because you presumably have a mains water service into the barn you will need to TT it.

 

[simbin]

The mains water into the barn is through one big ugly piece of plastic, so no earth required.

Thanks to Bugsy & Pennywise for much help & guidance. I will go for splitting the meter tails & terminate into a 63A switch fuse but without putting a spike in. Thanks once again.

 

[pennywise]

You will still need to earth the water at the first piece of copper after the poly pipe enters the barn or get the plumber to put in a small length if he's doing the whole lot in plastic. cheers