Discuss Garage earth in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
Possible. If you watch Mr JW, he gives a good explanation of types of supplies, 8.30mins for TN-CS, if you don't want to get too bored;
I realise this is going on and getting deep ...
Thanks very much. I already know all that's in the vid but thanks for your help.
Question is, if the neutral was lost on the supply to the house, then the house would be in the same potentially dangerous state as the garage which is being fed from it. So, what's the difference and why are we bothered about the garage but not the house ?
Not sure I agree with this bit of the video. In the video, he explains about an extension cable supplying say, a caravan outside and that there being a greater possibility of loosing the neutral in that type of cable than there is in the type that is used in the main supply ( concentric), which is very true. However, as the extension cable from house to caravan or house to garage would still have a connection to earth ( if only neutral is broken in that cable or flex ), and that earth would still be connected to the main neutral at the main supply to the property. The problems would surely only arise if the main neutral was broken.
So, what's the point in going all out to create a TT at the garage just in case the main neutral is lost in some freak accident, yet not bother with the house it is being fed by.
In addition, Is there the possibility of different earth potentials being created with an earth rod ?
There are sub stations on my housing estate and a transformer on a pole at the rear of the property.
So if the house is fed from a transformer on the estate and I put an earth rod in the ground within 50 meters of the transformer on the pole, does that matter ?
I realise this is going on and getting deep so I apologise for dragging this out.
As you seem to be really getting in your Earthing, here is some further reading for you.
Within the property this is why main equapotential bonding is essential to eliminate potential diference between suppliers earth and extraneuos conductive parts within property. Its no diferent to a shed!
Just as an aside Last plumber, I take it from your title, you will be employing the services of a competent electrician to complete this work?
Don't be deceived by the title and never judge a book by its cover.
I am more than competent with electrical work, qualified to do the work I am involved in day to day and fully insured to do it.
I do however, like to do things belt and braces and in such a way that any engineer looking over my work, has no comment to make other than the positive.
The cable was installed through to the garage by a commercial spark with over 30 years under the belt and he passed it off through building control during the extension work.
whoever finishes it has yet to be decided, my concern at this moment is
How it is done. As you can see, there are differences of opinion on this, therefore, I will make an educated decision as to which is the safest method before anything else is decided.
Thanks for the concern though.
And thanks to all of you for your responses so far.
Its no longer competent. It's skilled and trained. The competent person definition has been deleted in the current regs.
Mind you its still the competent persons scheme rather than the akill and trained scheme.
I never judge a book by it's cover, I normally look inside and have a butchers at the preface. Unfortunately in your case, there is no information about your qualifications in your profile, hence me asking.
And I was only asking, as often persons post here, seeking a step by step guide to carry out electrical work. As you state you are qualified, you will have the knowledge, experience and suitable tools and test equipment.
You have confused me about who installed the cable; you state it was installed by a 'commercial spark', but in #19, referring to the csa of the swa, you said ' it was four years ago I ran it'. Normally any notifications to LBC are done when the work is completed and fully tested, you don't have to notify to run a length of cable?
My concern is genuine though. Of late I have seen far too many poor and unsafe electrical installations, carried by persons who were not or should not be deemed to be competent.
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