Yes, ok.
And ofcause that would require re-running a cable through the house, and spending twice as much on the swa running down the garden. Circuit lenght is around 12m inside and 8-10 outside.
Daniel
Extending Cooker Feed - Notifiable?
- Thread starter dhutch
- Start date
And ofcause that would require re-running a cable through the house, and spending twice as much on the swa running down the garden. Circuit lenght is around 12m inside and 8-10 outside.
Daniel
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So if you where doing a 'perfect job' you would have a 60amp fuse at the CU, leading to 10mm csa cable, then the garage CU with you 32amp final circuit MCB/RCBO.
Daniel
Yep, I suppose that's about it - but for the average person who wants just a socket or three and some lighting in a garage, to do that just to achieve discrimination could well be regarded as rather 'OTT'!
Kind Regards, John
Yes, well at the moment, and for the last 14months ive had an extension out of the conservatory window, over the paving, under the garage wall and terminating in a 6way cabled tied to the framework from which everything in run, which it not overly diverse!
But it sounds as I could have some 4mm SWA run from the 4mm cooker feed by the external wall, along the fence and into the garage, junction box to terminate, and then a ring main or radial of sockets, off which came a 5amp FCU to the lighting ring. If i wanted a 16amp socket in future for a larger welder take that of the ring main with another fcu.
Daniel
But it sounds as I could have some 4mm SWA run from the 4mm cooker feed by the external wall, along the fence and into the garage, junction box to terminate, and then a ring main or radial of sockets, off which came a 5amp FCU to the lighting ring. If i wanted a 16amp socket in future for a larger welder take that of the ring main with another fcu.
Daniel
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A 16 amp socket should really be on a dedicated radial.
didnt think you could put a ring on the end of a piece of cable like that anyway?
I dont know, im just speculating what could be done. What you would do if you didnt do that then, predumably just a radial in 4mm daisy chaining socket to socket? I guess you could have two radials from the JB (which would be on the back wall) one down each side? Just seems logial to make it into a ring but if thats not ok, clearly not.
From what though? The junction box rather than the ring main, its not going to be dedicated right back to the house is it.
My current welder is a 150amp esab inveter mig which welds well off a 13amp socket, so its not a deal breaker, more of a 'if ive got an spark, he might as well future proof'.
Daniel
I can't see any electrical reason why not, provided that the cable up to the ring is of large enough CSA and (as discussed) protected by a 32A MCB - after all, that's no different from having a sub-main to a distant CU, from which a ring then originates. What one obviously can't do is, say, have a 2.5mm² ring connected back to the CU (and 32A MCB) via a single 2.5mm² cable. Having said that, I really don't see why Daniel needs a ring.
Kind Regards, John
You should now do some reading on what the Wiring Regulations say about avoiding hazards and minimising inconvenience in the event of a fault, taking account of danger that may arise from the failure of a single circuit such as a lighting circuit, taking account of the consequences of the operation of any single protective device, and so on.
It could be a lot more serious than "not ideal".
Lazy, bad design, and arguably in contravention of the Wiring Regulations. The fact that it is commonly done changes none of those.
Or, even better, a switchfuse in the house - get it off the CU altogether.
Indeed so. However, as I said, whether such is justified for the average garage supply is another matter. As has been implied in this thread, if we advised people that such an 'even better'/ideal approach was the way it 'must' be done, then many would probably resort to an extension lead chucked out of some window, which is probably the least ideal 'solution'!
Kind Regards, John
I being the person responsible for the design of the electrical installation (as indicated by my signature below), particulars of which are described above, having exercised reasonable skill and care when carrying out the design hereby CERTIFY that the said work for which I have been responsible is to the best of my knowledge and belief in accordance with BS 7671:2008 including the requirements for avoiding avoiding hazards and minimising inconvenience in the event of a fault, for taking account of danger that may arise from the failure of a single circuit such as a lighting circuit, for taking account of the consequences of the operation of any single protective device, and so on, none of which are, to the best of my knowledge and belief, qualified in BS 7671:2008 as not applying to an average garage.
As I said - the fact that it's often done badly does not mean that it's not actually done badly.
As I said - the fact that it's often done badly does not mean that it's not actually done badly.
Utopia is a fairly attractive concept, but probably much more boring, and maybe less fun, than the real world.
Kind Regards, John
Ah well - one man's boring and less fun electrical design is another's professionalism and sense of responsibility and duty of care, I guess.
Maybe. Professionalism does not necessarily preclude (indeed, probably should include) realism, common sense and case-by-case risk assessments - and, in the case we're discussing, there is enough wiggle room in the wording of the regs to allow professionals to make some decisions on their own, rather than having to act as robotic followers of a cookbook - i.e. be proper professionals.
Kind Regards, John
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