Garage fuse board

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Poor old PrenticeBoyofDerry, wandering out into no-man's-land. He was a good soldier.
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TTC ducks head under parapet to avoid snipers and possible injury from shrapnel.
Covers head with thick towel and waits for the inevitable explosion.........
 
robo123 said:
What sort of box do I need?
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Let's cut to the chase - the sort your electrician installs for you, unless you don't want the work done for quite some time.

The questions you are asking show such a lack of fundamental knowledge that you are a long way off being competent to do this work. You seem to think that you can design and install new circuits from a new CU, and all you need to do is to ask what ratings of MCBs to use and you'll be all set.
  • For a circuit to supply a given load, how would you go about deciding what cable and protective device to use?

  • Do you understand the importance of EFLI?

  • Do you recognise the terms Ib, In, Iz, Ze, Zs, R1+R2?

  • If you still intend to run a sub-main off the house CU have you given any thought to discrimination?

  • If you aren't going to do that how will you isolate your supply so that you can connect up your new CU?

  • Do you know which circuits can be ring finals and which cannot, and what the advantages and disadvantages of each are?

  • Do you know what the two main lighting circuit topologies are, and what the advantages and disadvantages of each are?

  • How do you calculate maximum demand and how can diversity be used?

  • What are the 3 different types of domestic single-phase supplies provided in this country, how would you recognise them, and what differences do each make to the requirements for the rest of the installation, particularly any outdoor supplies?

  • Can you correctly identify all components and connections of a circuit by method of testing or otherwise? In doing so can you identify or recognise anything wrong or dangerous with the circuit?

  • Do you understand how the way in which you install cables affects how much current they can carry?

  • What are the rules concerning cables concealed in walls, partitions and under floors?

  • What are the rules for cables run outdoors, buried in the ground or overhead?

  • Where cables need to be joined, how should this be done / not be done and in what circumstances are different methods acceptable?

  • Can you identify extraneous conductive parts, and do you know the requirements for main and supplementary bonding of them?

  • Which circuits should be RCD protected?

  • Do you know what tests you would carry out on the installation - what sequence you'd do them in and at what point you would energise the installation, and for each test do you know what is being measured, why it is important, how you would carry out the test, and with what equipment, and what sort of results you would expect to get if everything was OK?

The thing is, rewiring a house, installing new CUs, outside supplies, submains etc is not a trivial job, and I can assure you that it involves knowing far more than you think it does.

If you want to DIY then you've got a fair bit of learning to do, and spending on books and test equipment.

Asking questions here can be a useful part of a learning process, but they are not a substitute for proper structured studying. The key term there is "learning process" - you cannot learn all the things you need to know just by asking questions here. It isn't structured enough - it won't provide you with a way to progress where each step builds on what you learned before.

You can't carry out a job of this magnitude by asking whatever random questions happen to occur to you. You've already shown that you have some dodgy misconceptions - what if you get something wrong because you have no idea your knowledge is wrong? What if you miss something because you simply have no idea it even exists, and just don't realise you don't know it?
 
robo123,
Alas the nature of the work you plan to carry out, will be notifiable. That does not mean that you can not DIY it. You just need to make an application to building controls under electrical work, prior to starting work, explaining what you are doing and how you intend to perform it. They will charge you a fee, that sometimes for the work being done is astronomical, then come out and inspect your work. They may or may not depending on the way your council is run, ask you to supply schedules of inspection and testing along with an EIC. or they may contact someone to do that for.
The installation you wish to make, if you do have some fundamental knowledge of electrical installations, inspection and testing, may not be beyond you.
But by some of the question you have asked, I don't quite think your up to full speed just yet.
If you can clarify some of the questions asked to you in earlier posts, regarding the supply side. Earthing arrangement, cable supply type of house to garage the size, route taken and method installed, also main fuse rating and the current demand already applied to it. If RCD protection is installed and size of earthing conductor and main bonding to gas/electric/oil/metal work etc.. Some of us kind people on here, may be able to offer some constructive help.
 
Guys, this is getting way too involved. It's a simple swap with a couple of sockets added. The current install is all new from when house was built not DIY. I was only after a few bit of advise for my own interest if nothing else.

Please close this thread.
 
robo123 said:
Thanks for your lengthy reply. To summarise I do have an underlying knowledge of electrics and electrical testing as I'm a gas engineer.
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Really...
robo123 said:
I want to run multiple sockets, outside light, garage light and outside socket. What sort of box do I need?
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robo123 said:
What I'm not too sure about are the different trips switches.
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robo123 said:
Basically I'm unsure which MCBs I need for lighting and socket rings.
Click to expand...


I've simply been asking questions to see I it were achievable.
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But your underlying knowledge doesn't go far enough for you to even know if you can install a CU in the garage?


Let's be honest, we've all added a new socket at some point in our lives.
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What you're proposing to do is a lot more complex than that.


I never dream of rewiring a house, this is a garage with minimum circuits.
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It doesn't matter that it's a garage. It doesn't matter if it's 4 circuits or 40 - they all still have to be designed properly, installed properly and tested properly.


That's why I'm asking.
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And did you see all of the questions people immediately started asking you?

Why didn't you already know vital information like what was the nature of the supply from the house CU? Did your underlying knowledge not go far enough for you realise how significant that was?


I the answer to everything is get an electrician I think this subsection of the forum should be closed with a 'sticky' saying get a pro.
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No - the answer to everything is not that.

ban-all-sheds said:
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unless you don't want the work done for quite some time
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you are a long way off being competent to do this work
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If you want to DIY then you've got a fair bit of learning to do, and spending on books and test equipment
.
.
Click to expand...


robo123 said:
Guys, this is getting way too involved. It's a simple swap with a couple of sockets added.
Click to expand...
But it isn't a "simple swap" - maybe you mistakenly thinking that it was is why you now think it's getting way too involved, when the truth is in reality it always was this involved.


The current install is all new from when house was built not DIY.
Click to expand...
Why on earth does that make any difference to what you need to know to be able to make these changes to it?


I was only after a few bit of advise for my own interest if nothing else.
Click to expand...
Fine - but as I said, you can't carry out a job of this magnitude by asking for a few bits of advice about the things you think you need to know and ignoring all the things that you don't even realise you need to know.
 
robo123 said:
Guys, this is getting way too involved. It's a simple swap with a couple of sockets added. The current install is all new from when house was built not DIY. I was only after a few bit of advise for my own interest if nothing else.
Click to expand...
The questioned asked are all valid questions, that is if you are after professional advice on how/what is the best way forward for a well designed and safe installation?
Not too involved at all, the questions need to be answered or we can't help, as we are remote to the proposed work and can not guess what you have in place.
You are asking us questions that can not be informatively answered without your cooperation.
 

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