Fault on socket circuit

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Discuss Fault on socket circuit in the UK Electrical Forum area at ElectriciansForums.net

Fitzy said:
Sooooo, based on the op’s original post and subsequent assumptions and answers a ring final circuit is BROKEN because it has a spur or spurs on it and yet he doesn’t test at every socket to confirm any spurs etc.....
Click to expand...
No proper facts or test readings other than things being unplugged. I am sure that members would be more than willing to give possible causes if the OP has drawn a blank but basic testing needs to be carried out first.
 
Fitzy said:
Sooooo, based on the op’s original post and subsequent assumptions and answers a ring final circuit is BROKEN because it has a spur or spurs on it and yet he doesn’t test at every socket to confirm any spurs etc.....
Click to expand...
That's about it Fitzy
 
How many circuits are controlled by that RCD. If it trips randomly it could be that the total leakage to earth is more than 30mA, that would explain why it trips when plugging into different sockets etc.
I had exactly the same happening on a few occasions in domestic installations.
 
Murdoch said:
^^ I did say this in a roundabout way in post #2

But I suspect the op doesn’t understand the benefits of these meters .......
Click to expand...

13730747_1053589748011609_1601688944_o.jpg
 
If the ring is broken then the chances are at least one of the live wires has come out of its terminal and is loose behind an accessory; every time this touches against anything which is earthed (including a metal backbox) the rcd will trip.
Changing the protective device won't stop this.

... Or have I missed an 'inside joke'?
 
westward10 said:
I brought this up last week about idiotic random pics that keep being put up, tedious, irritating and boring.
Click to expand...
I feel the same way about most of Pete's posts - I don't need a dedicated post to tell me he agrees with someone when there's a special button for precisely that purpose, or that he has "nil experience" in the matter in hand but going to have a guess anyway.
Do your worst, I've got a galvanised bin lid.
You got any of that popcorn left Strima?
 
Adam W said:
I feel the same way about most of Pete's posts - I don't need a dedicated post to tell me he agrees with someone when there's a special button for precisely that purpose, or that he has "nil experience" in the matter in hand but going to have a guess anyway.
Do your worst, I've got a galvanised bin lid.
You got any of that popcorn left Strima?
Click to expand...

Cuki8ysWEAICFiy.jpg
 
We did bring you to task about this last week @elsparko and you said you'd stop.
Its like the alter ego that we all want to put in a box and bury in the garden!
We know where you live (we actually don't but just wanted to sound menacing!)
 
I like some off-topic stuff, including cartoons...but maybe the "Off Topic" thread is a better venue for them?

On a different theme, man said today, as I asked him some questions about rewiring this building...
RFC or radial?
Go with RFC
OK, cooker circuit? separate circuit?
Yes, every day.
Fair enough...
I'm thinking 10mm, but with diversity could be 6mm, however, cost isn't an issue so I'll go with the 10mm.
What's diversity?
2.5.mm rfc x 3 for sockets?
Yeah, whatever...
Clipped direct? We are plasterboarding 12mm but there will be 300mm insulation, so keep it clipped direct to joists?
Oh, it won't matter, we're throwing in a load of rcbos so they'll take care of any problems, just carry on.
1mm or 1.5mm for lighting?
Oh, whatever you've got handy will be fine!
Now, you all know I am not an electrician, but I am happy to lay in the cables and sockets and light fittings etc.
however, and I may have this totally wrong, but wouldn't you calculate the cabling and loads, then specify the protective devices, rather than think "Hmm...RCBOs? They'll cover everything!"
OK, they have to be sized accordingly, but I kinda thought the circuit design was the most important element. I mean, we won't go far wrong with 2.5 for sockets and 1 for lights (they will all be LED) and 10mm for the cooker (2 ovens and 5 rings...don't know the rating yet) but it's a 10m by 10m building, single storey so no fancy stuff...
Apparently, this kind guy is going to inspect, terminate the circuits and issue certificates, so why should I worry? It's a charity, and we are very lucky to get his input. Just concerned...
probably shouldn't be...I'll lay the cables, do the sockets. let him test...
or should I be concerned?
 
pirate said:
I like some off-topic stuff, including cartoons...but maybe the "Off Topic" thread is a better venue for them?

On a different theme, man said today, as I asked him some questions about rewiring this building...
RFC or radial?
Go with RFC
OK, cooker circuit? separate circuit?
Yes, every day.
Fair enough...
I'm thinking 10mm, but with diversity could be 6mm, however, cost isn't an issue so I'll go with the 10mm.
What's diversity?
2.5.mm rfc x 3 for sockets?
Yeah, whatever...
Clipped direct? We are plasterboarding 12mm but there will be 300mm insulation, so keep it clipped direct to joists?
Oh, it won't matter, we're throwing in a load of rcbos so they'll take care of any problems, just carry on.
1mm or 1.5mm for lighting?
Oh, whatever you've got handy will be fine!
Now, you all know I am not an electrician, but I am happy to lay in the cables and sockets and light fittings etc.
however, and I may have this totally wrong, but wouldn't you calculate the cabling and loads, then specify the protective devices, rather than think "Hmm...RCBOs? They'll cover everything!"
OK, they have to be sized accordingly, but I kinda thought the circuit design was the most important element. I mean, we won't go far wrong with 2.5 for sockets and 1 for lights (they will all be LED) and 10mm for the cooker (2 ovens and 5 rings...don't know the rating yet) but it's a 10m by 10m building, single storey so no fancy stuff...
Apparently, this kind guy is going to inspect, terminate the circuits and issue certificates, so why should I worry? It's a charity, and we are very lucky to get his input. Just concerned...
probably shouldn't be...I'll lay the cables, do the sockets. let him test...
or should I be concerned?
Click to expand...
most domestic circuits can be guessed at regarding cable size etc, unless youve got some fancy appliances/heating system its fairly straight forward, the lights are either going to be 1 or 1.5mm, sockets 2.5 for RFC, probably get away with 6mm for hob/oven depending on loads/distance from board, id definitely be doing calculations on the hob/oven supply but 10mm will probably cover it

nothing stopping you from running your numbers through one of the online calculators to see if it draws up anything though
 
I guess that's the best idea elsparko...
TBH, it's not a huge building, 2.5 for sockets, 1 for lighting (or 1.5 if anyone donates it!) and just go with 10 for the cooker...don't sweat the small stuff, eh?
Oh there's a welder going in a corner of one workshop...nothing fancy,maybe 32A at board?
Just finished the water supply today, and it's looking ok, though I say it myself! Simple cold feed throughout, with a couple of POU heaters for the kitchen and workshops. No ceilings in, so it's all good for wiring too!
 
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