that would be due to differential in relative earth over that sort of distance Noz, you could prob find a 10 or 15v difference between actual earth and exported earth over that sort of distance, and thats not taking into account the difference in ground type.
Sounds good, as there is water in the garage. Will run in 6mm though, as if I remember rightly that is an adequate size for TT.oh my my....glad you're taking an interest tho.
depends on your situation,
BUT,
it may be a good idea to run an additional 10mm earth (equipotential bond) along with your submain.
TBH a little more specific info as regards the garage (installed equipment and water etc) would be beneficial.
6mm will be more than enough, how big is your Neutral tail? have you done a voltage drop calc for PFC? and also for Ze?
sorry, sometimes I just go overboard a bit sometimes. BlushingIf 6mm is legal, its legal - havn't double checked yet but will before doing job. I suppose if system was ever upgraded to PME then it would have to be 10mm. (Can't quite undesratnd how fault from neighbour would shoot up water main, it being buried in earth I would expect it to dissipate to ground). But your right about not having to worry if exceeding cable sizes, and I found a drum of 10mm buried in my van yesterday that I had forgotten about, so will use that. After all, there's no point in asking advice if not prepared to listen
Yeah but, no but, yeah but, no. Having been trained and responsible for Health and Safety at several 'blue chip' organisations, the magic phrase in H&S legislation is 'reasonably practicable'. ie you are allowed to apply common sense to different circumstances, otherwise nothing would ever happen or cost too much to do. After all, to be perfectly safe from electricity, you wouldn't allow the public to use it at all.Which, In My Humble Opinion - Is the BEST way to work it!
I think you will find that you can NEVER use that arguement for the safety of an electrical installation.Yeah but, no but, yeah but, no. Having been trained and responsible for Health and Safety at several 'blue chip' organisations, the magic phrase in H&S legislation is 'reasonably practicable'. ie you are allowed to apply common sense to different circumstances, otherwise nothing would ever happen or cost too much to do. After all, to be perfectly safe from electricity, you wouldn't allow the public to use it at all.I take the stance that I'm only working on one property and can only control that one installation, some clever bods in offices/ laboratories have worked out all the ins and outs of domestic electrics and written the regs accordingly and no doubt from 'fail safe' position. Therefore if I comply with regs on my work, I do not need to consider the neighbours or lightning strikes or anything else. :OPray
thank you Mr S for pointing out the blindingly obvious to me which I couldnt see cos of my own stoopidity there.Steps, it's the Electricity at Work Act not 'Regs' which is what makes it a law. Only Act's that are passed by Parliament are enshrined in the law books.
No liability is liabilty, which is what we take on every time we start a job, and hence should be charging for.
before going back to :z 
