Outbuilding on non RCD side of C/U?

[Nicebloke]

If running power to an outbuilding (usually a garage at the bottom of someones garden), I normally run it from the non RCD side of the C/U in the house and then put a 2 way RCD protected C/U in the garage. I was however, told that I can no longer do this as it must be connected to an RCD in the house C/U. I was also told that any outbuilding more than 20 metres away from a house must have it's own TT system?

 

[Pete999]

OP, I would consider emailing your scheme's technical support, and seek clarification on this matter. I find emailing gets a more defined and considered response, than by speaking to an individual.

I'm with Elecsa, and quite often I've read & heard conflicting guidance on issues (nothing as profound as this mind), when watching their web broadcasts, and what is written in their 'Connections' publications. The last one was about upgrading bonding, it used to be it was okay to leave as is, if there was no sign of thermal damage. Then the mag' said, no it must be upgraded, then the dynamic duo said, it was ok to leave etc.

Dynamic Duo One has to be TC who is the other?

 

[Toneyz]

It does seem to vary between assesors doesn't it. My last assesor was great & really did know his stuff, but the one before that started to get all confused (I saw it on his face) when I was explaining why I used an s type rcd to replace the main switch in an all rcbo board on a TT supply.

That's a bit concerning.

 

[Midwest]

Dynamic Duo One has to be TC who is the other?

View attachment 35801

Darren Staniforth. The pair of them, quite often seen travelling the length & breadth of this country, spending my money on expensive hotels, cordon bleu meals and fine wines

 

[Ib≤In≤Iz]

That's a bit concerning.

It is isn't it.

 

[Pete999]

View attachment 35801

Darren Staniforth. The pair of them, quite often seen travelling the length & breadth of this country, spending my money on expensive hotels, cordon bleu meals and fine wines

Could picture him but couldn't put a name to the face

 

[Midwest]

Could picture him but couldn't put a name to the face

Allegedly, Mr Cable is retiring soon, so he'll have to buy his own Chateau Lafite Rothschild and Rib of beef with truffle jus.

 

[Nicebloke]

^^ so what did you say when he made his "claim"?

I explained why I did it the way I do, and he said it still had to be on an RCD in the house C/U. With regards a TT system being required if an outbuilding was more than 20 metres away from the house, I just said that I honestly wasn't aware of that.

I could have asked him to show both the above in the regs, but I just wanted to pass the assessment (which I did), and I admit that I did slightly doubt myself that he must be right as he seemed so confident.

I have had assessors before from another body who knew their stuff, so as already suggested some are clearly better than others and it's the luck of the draw.

 

[Midwest]

I explained why I did it the way I do, and he said it still had to be on an RCD in the house C/U. With regards a TT system being required if an outbuilding was more than 20 metres away from the house, I just said that I honestly wasn't aware of that.

I could have asked him to show both the above in the regs, but I just wanted to pass the assessment (which I did), and I admit that I did slightly doubt myself that he must be right as he seemed so confident.

I have had assessors before from another body who knew their stuff, so as already suggested some are clearly better than others and it's the luck of the draw.

As suggested, email and get clarification.

 

[Andy78]

Andy,I don't doubt for a moment that they have assessors who are at the top of their game

quote
That team will also include inexperienced assessors

Ah yeah sorry, missed that bit.

 

[Leesparkykent]

It is isn't it.

Hmmm intriguing.. What make were the RCBO's out of interest?

 

[Leesparkykent]

View attachment 35801

Darren Staniforth. The pair of them, quite often seen travelling the length & breadth of this country, spending my money on expensive hotels, cordon bleu meals and fine wines

Yeah they are advertising ATM for some one to replace Tony cable as he's retiring...To work along side doppy Darren

 

[Ib≤In≤Iz]

Hmmm intriguing.. What make were the RCBO's out of interest?

Wylex mate, single pole.

 

[Leesparkykent]

Wylex mate, single pole.

How come the upfront S type then? I'm interested now.

 

[Midwest]

Yeah they are advertising ATM for some one to replace Tony cable as he's retiring...To work along side doppy Darren

Could be worse, I could be paying this bunch of misfits to travel the world.
View attachment 35806

 

[Ib≤In≤Iz]

Because some single pole rcbo's will only disconnect the L leaving the N connected in a fault, so if you had a N - E fault the rcbo would trip, but the N - E fault would still be present and current will be flowing. the upfront s type would detect this and trip. Kind of like a backup really if that makes sense.