New sub board for shed swa advice.

[Jcamerz]

Hi guys new to the forum after bit of advice. My family are installing a new shed in the garden and require a lot of power ie few sockets, lights. I am planning of running a swa fed from 32a mcb from the main board to a sub board.
Have a question-
Shall I install the new 32a mcb in the main board on the RCD side or main switch side?
Thanks

 

[Ian1981]

I wouldn't have a clue who it was aimed at, but I can assure you I am not bigbob1, because I'm not following all that he has posted, and I believe whilst it may need discussion that this thread is not the place to be discussing exporting PME, because that really is off topic.

So, sorry for mixing that up, but #e5 has been in my signature on here for many, many months now.

I have nothing against #e5
My quote was in response to bigbob spouting nonsense about exporting the installation earth and hashtaging e5 and which I don’t think is in the spirit of their codes.
I’ve never noticed anyone on here use it before to be honest, if you check I’ve not had any quaral with you on this thread nor replied to any of your comments till now.

 

[Toneyz]

It wasn't just hitting the live, it was through the live and cpc.
However, the install was not correctly tested, and the cpc was vaporised when the installation was energized, i.e. the dead testing which should have been done, and wasn't would have found the fault.
Ergo the negligence of the QS signing off the EIC, and the QS allowing inadequately skilled persons to undertake the work under their supervision, thus inadequate supervision of their subordinates also, but I'm not sure of the details of the charge.

I can't recall reading in the trade press or the NICEIC letter regarding it was through the CPC as well and no dead testing only recall it read about screw through live. If what you say is correct highlights reality that bosses think won't happen.

 

[netblindpaul]

I have nothing against #e5
My quote was in response to bigbob spouting nonsense about exporting the installation earth and hashtaging e5 and which I don’t think is in the spirit of their codes.
I’ve never noticed anyone on here use it before to be honest, if you check I’ve not had any quaral with you on this thread nor replied to any of your comments till now.

No worries, sorry Ian, I think that there is merit in discussing exporting earths, just not in this thread.
I think he has some valid points, but may not have made them well.
#e5 has been in my signature on here for several months now, perhaps even a year, or more.

 

[netblindpaul]

I can't recall reading in the trade press or the NICEIC letter regarding it was through the CPC as well and no dead testing only recall it read about screw through live. If what you say is correct highlights reality that bosses think won't happen.

If you read the Coroners report and the expert witness investigations, the cpc was vaporised by the fault, I'm not saying that there was no dead testing, but it would seem that the cpc had been vaporised before the insulation resistance testing had been done, i.e. the installation was energised before the correct sequence of dead testing had been completed.
Something should have tripped when that happened, so it should have been investigated.
That seems to have been missed.
Of course, once the cpc was gone there was no path to earth to detect the fault, where as if the testing had been done correctly, this would have been located.

 

[a-z electrics]

I assume it's a 3 core SWA with one core the installation earth? And it's easy to terminate the armour using a banjo washer and stranded wire, or get a pirhana nut as suggested.

 

[sparksburnout]

how the hell does the CPC "vaporise" when the circuit was energised?? If there was a dead short between L-E then the OCPD would have tripped. Sounds a bit iffy to me.

 

[Deleted member 9648]

Clearly this thread proves the earthing of an SWA feeding a shed is an immensely complicated issue far beyond the capabilities of an electrician.... and a legal minefield. I think the regulations should only permit Electrical Engineers with a minimum of 50yrs experience to install a sub to a shed. Either that or electricity in sheds should be banned outright and thousands of lives will be saved.
I'm not going anywhere near my shed until it has been disconnected by the SAS in full protective regalia, and I'll wont sleep easy ever again, haunted by the realisation that I've been doing it wrong all these years.

 

[bigbob1]

‘Respect for life, law, the environment and public good’

If you CRA something and come to the conclusion it’s okay to do. Then you have no respect for life or law.

You take the worst case scenario and you put processes in place to try and counteract it. You don’t save £5 and hope it’s not you that kills someone, because you knew it can happen, but did nothing to counteract it.

 

[bigbob1]

Clearly this thread proves the earthing of an SWA feeding a shed is an immensely complicated issue far beyond the capabilities of an electrician.... and a legal minefield. I think the regulations should only permit Electrical Engineers with a minimum of 50yrs experience to install a sub to a shed. Either that or electricity in sheds should be banned outright and thousands of lives will be saved.
I'm not going anywhere near my shed until it has been disconnected by the SAS in full protective regalia, and I'll wont sleep easy ever again, haunted by the realisation that I've been doing it wrong all these years.

Legal minefield when you kill someone or burn a shed down. Yes!

 

[bigbob1]

I have nothing against #e5
My quote was in response to bigbob spouting nonsense about exporting the installation earth and hashtaging e5 and which I don’t think is in the spirit of their codes.
I’ve never noticed anyone on here use it before to be honest, if you check I’ve not had any quaral with you on this thread nor replied to any of your comments till now.

You shouldn’t export a DNO earth without their consent. What you do is provide your own! That’s called TT and doing the RIGHT thing. Get over yourself.

 

[Ian1981]

You shouldn’t export a DNO earth without their consent. What you do is provide your own! That’s called TT and doing the RIGHT thing. Get over yourself.

your ----ing in the wind bob.
All them school jobs I’ve done where different buildings exist from the same installation, all the new build student block accommodations I’ve been involved with and army base new builds ,all with the installation earth extended to each building and non TT.
All the jobs I’ve been on and tested etc, don’t recall many being TT where numerous buildings exist but all must be breaking your law then?

 

[Pete999]

For God's sake don't give him more excuses

 

[Ian1981]

For God's sake don't give him more excuses

I won’t pete I’m turning the notifications for this thread well and truly off

 

[Pete999]

I won’t pete I’m turning the notifications for this thread well and truly off

Good man I'm ignoring, just as good

 

[netblindpaul]

how the hell does the CPC "vaporise" when the circuit was energised?? If there was a dead short between L-E then the OCPD would have tripped. Sounds a bit iffy to me.

I dunno, but that was the expert witness evidence provided by the forensic investigation.
If the circuit was repeatedly energised then it may well have blown the cpc away, we don't have adequate detail to know.
What was the fault current, I think it may have been a block of flats?
As she was definitely in a flat, so the sub may have been close.
There was no RCD on the circuit, so the fault would have been at full PFC at that point.