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equipotential

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  1. S

    Equipotential Bonding

    Hi, Can someone explain the science behind the need for 10mm earth cables to gas, water etc? Or is this simply a justifiable rip off for big companies as the size required has gone up slowly over years - the main reason so many DIYers have a go! A 100a fuse feeds a consumer unit through 25mm...
  2. J

    Supplementary equipotential bonding

    Could I have some clarification on this issue , the tight customer does not want a new CU , so the only option is supp bonding the bathroom , from what I've read is link the hot and cold copper pipes and the rad and that's it . Bs7671 does not require a link from the supp bond to a cpc on...
  3. V

    installing new circuit, advice on equipotential bonding in the house

    if you install a new circuit in a farm shed, does the equipotential bonding need to be in place right back at the supply in the house (onto oil and water), or as its a seperate building does the full electrical installation certificate mean the equip zone within that shed only required??
  4. J

    c/u change no Equipotential bonding

    Hi guys. Am changing a consumer unit but the property has no equi bonding to incoming water. Usually I would make sure it is installed but from where the supply is would be a big job to put it in. Can I still sign my work off and note that it's been advised or do I insist that the customer pays...
  5. D

    Anyone read this book "An Illustrated Explanation of Earthed Equipotential Bonding"

    http://www.amazon.co.uk/Illustrated-Explanation-Earthed-Equipotential-Bonding/dp/1449041612/ref=sr_1_sc_3?s=books&ie=UTF8&qid=1363822682&sr=1-3-spell Apparently its terrible. Check out the reviews they are pretty funny........im quite tempted to buy it just to see what they are on about lol
  6. O

    Equipotential Bonding - guide from EON

    All, I was given this today (see photo's below) which was provided after a gas meter was replaced. In many ways a useful clarification of what and where is acceptable, i.e. inside the house or inside the meter cupboard! Shame that the authors of BS7671 don't produce diagrams that are...
  7. S

    Supplementary Equipotential Bonding

    I recall being taught that if you measure continuity between the MET and extraneous-conductive parts in a bathroom and, as a rule of thumb, it is either less than 1667 ohms or more than 1 M ohm, then you do not need supplementary equipotential bonding. I think I understand that the 1667 ohm...
  8. I

    do you still need to contact DNO when exporting TNCS earth

    hi dont want to open the usual debate re tncs earth, looking for where i can find out the answer as to weather the DNO still needs to give permission for there earth to be exported any one help ?
  9. E

    Upgrade to equipotential bonding proposal

    ON an EICR today I observed an installation with two properly connected equipotential bonding cables to gas and water services run correctly to the DB. However these two cables were 6 sqmm, not 10sqmm CSA as now required by the Regs. Its a period property with wattle & daub walls and the route...
  10. E

    Equipotential bonding

    Ok hard hat on. Ive wired a garage with a water pipe. Ive taken a 10 mm back from the pipe to the MET in the house (TNS). The board in the garage is RCD protected. So far all the same as the IEE Supplying a Detached Out building booklet recommendations. Can I run another 10 mm from the pipe...
  11. D

    Supplementary equipotential bonding

    Hi all. I need some clarity on this please. 411.3.1.2 states efectively connected to the protective equipotential bonding. What is considered effective? Is this thru say the metallic pipework of the heating system ect...? Also what about a new build with all plastic pipework? I am on a new...
  12. G

    earth free equipotential local bonding

    Hi, Could anyone on this forum explain me what "earth free equipotential local bonding" is? Thanks
  13. 1

    Regulation 544.1.2 - Main Equipotential Bonding to Gas and Water

    I'm hoping that by posting this thread that someone with far superior knowledge of the Regulations will be able to help me see through this "Where practicable" part of the reg please. I have been working with another spark today on a job where a second consumer unit needed to be fitted. During...
  14. G

    Main Equipotential Bonding in flats

    am testing a block of flats at the moment, was an old house converted into flats, each flat consists of 3 consumer units which are fed off one main consumer unit in each of the kitchens in each flat. Does each flat require a bond to the main incoming water of that flat. Their is only one supply...
  15. La Poste

    TT Earthing question// Volt drop

    Greetings. I have a question, this has been puzzling me for a while. If a put an earth rod in the ground and use it as my main earthing method and measure the resistance I find it to be 160 Ohms. Ok, Assume there are no RCD's and a link is made between the phase/line and earth at the...
  16. E

    Equipotential Bonding

    Hi all I was looking for the section in the red book that gives the size of the water and gas services bonding cable. I know for domestics it's 10mm and 16mm main earth to the consumer unit but what table actually gives it to you the sizes.
  17. S

    Equipotential lead direct to a TT earth stake

    Had a interesting scenario crop up this week when was asked if it was ok to take a new 10mm equipotential wire from gas pipe to outside earth stake onto a new earth clamp below the existing 16mm earth conductor clamp rather than go all the way back to the MET. If not ok can someone suggest a...
  18. Jimmy Boy

    Clarify Equipotential bonding please

    Amp Davids post got me thinking I do that too much but something bothers me, I expect I will have the answer in a split second..;) Setting aside the 17th rule, assume an old 16th Bathroom, 415.2.1 states how to cross bond correctly between fixed equipment and exposed/extraneous conductive...
  19. E

    Equipotential bonding Help

    Gents, I have replaced a consumer unit for a friend, however my pre works survey pickup that there was not Equipotential bonding on any radiators and that there was no path back to earth. I assumed that the piping was in plastic but wanted to confirm with my friend, he confirm that the boiler...
  20. 1

    main equipotential bonding

    Hi all some advice please. when it comes to main equipotential bonding can i run a 10mm2 from the met to the incoming water pipes and a sperate 10mm to the gas or does it have to be a single 10mm from met to gas and looped on to water pips? and also if the main equipotential bonding is in...

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