main bonding

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  1. LmarshallSparks

    Main Bonding with a crimped lug fixing!

    Hey All, At college, I was taught that main bonding - such as bonding to a gas pipe - must be carried out using a continuous copper conductor running directly from the Main Earthing Terminal (MET) to the pipework, with no extensions or alterations permitted. If the bonding cable is damaged or...
  2. M

    Main bonding questions

    Probably a basic question In an installation with pipework or cable ladder that's not extraneous as such but is connected to earthed metal What's the logic for not main bonding it as the metalwork can surely introduce a potential in a fault situation?
  3. cliffed

    Main bonding to metal container inside warehouse

    Seen many answers on this but still not sure on a definite answer. Power installed inside metal container, the units inside a warehouse, the supply to the warehouse 200amp TNCS The power points are Rcbo protected,so is the lighting inside the container, 16/6 amp respectively. Will this-require...
  4. W

    Queries on main bonding

    Just want to know everyone’s approach to testing bonding within houses. I do a lot of EICRs, and I would say more times than not I can never get access to the water bond as the stopcock isn’t accessible. Now in this instance what I’ve been taught since my times been out is to test at any exposed...
  5. dodger421

    Main Bonding Puzzle

    Hopefully someone wiser than me can help explain some odd measurements I’ve taken at my own home. This is a long read, I’ve tried to give as much information as I can because I suspect I’m over thinking the problem and missing something obvious that’s causing insulated pipework to have earth...
  6. timhoward

    Main Bonding csa when earthing csa calculated

    Just double checking please - in situations where the main earthing conductor csa is calculated, and in a TNS installation, the 50% bonding conductor csa rule still applies to your final calculated and rounded up earthing conductor size? (As opposed to the tabulated size) I'm doing remedials and...
  7. A

    Main bonding and parallel earth paths

    Hi all I was wondering if anyone could shed some light on an issue I cant seem to get my head around, say we had a metal socket earthed and a water pipe with main bonding, I touched the both of them in fault condition on socket (live touching metal box) now i understand the bonding puts the pipe...
  8. Pretty Mouth

    Main bonding, supplementary bonding

    A technical question: Regulations require us to bond extraneous parts back to the MET with an appropriately sized bonding conductor. I don't dispute that, that's what the regs say so that's what I do. In situations such as outbuildings with extraneous parts, where the distributor's earth is...
  9. G

    Main bonding gas

    Hi, just looked at a job to replaced a CU in an old bungalow with a detached garage (garage has is own CU). The gas meter/supply is in the garage and currently no visible bonding. My question is where should the gas be bonded and which CU should it be run from or should it be bonded both in...
  10. Dartlec

    Novel gas main bonding

    Thought I was onto a real winner today when checking the gas bond to find a nice bonding conductor run directly to a local earth rod: The main house is currently TT with a rod on the opposite side of the house, so maybe they thought the foundations counted as a massive MET :rolleyes: Was...
  11. D

    Main Bonding for incoming plastic pipe

    Hello All Noticed the existing bonding for the cold water supply is only 4mm. The supply pipe out of the ground is clearly a plastic pipe. It joins a brass stopcock under the kitchen sink cabinet and the rest of the plumbing in the house is in copper. I'm worried I need 10mm bonding and will...
    • Deleted member 112675
    • Thread
    • bonding incoming main main bonding pipe plastic
    • Replies: 6
    • Forum: DIY Electrical Advice
  12. snipersmith87

    Main Bonding - Multiple Buildings

    Could somebody please put me on track. Main bonding conductors are sized relevant to earthing conductor (TN-S / TT) or PEN conductor (TN-C-S). On a large installation (Industrial / Commercial) with multiple buildings containing Extraneous parts should ALL the bonding conductors be sized the...
  13. E

    UK Main Bonding Dilema

    Hi guys, just looking for a few thoughts on this one. This is a pretty big property with the gas meter situated in a small outhouse. There is no power in the the outhouse. The supply pipework comes out of the ground in copper into the meter. Then exits the meter in plastic and goes below...
  14. T

    Main bonding to water question

    Hi folks, Just wanted to check and see if bonding is required in this situation: There's no bond to water pipework, bond to gas all present and correct There is a piece of plastic pipe at the point where the water enters the building, probably around 100mm in length There is then a mix of...
  15. Soulcraft Electric

    BISF (British Iron and Steel Federation) prefab houses and main bonding

    Carried out a couple of EICRs on BISF prefabs and on both there is no main bonding to the steel frame of the building. My scheme technical helpline advised that main bonding was not required. Just wondered what people's thoughts are here? These are NOT pictures of the actual lofts (the roof...
  16. HappyHippyDad

    Understanding the new regulation regarding Main Bonding.

    Regulation 411.3.1.2 states .... Main bonding conductors shall connect to the main earthing terminal extraneous conductive parts. It then goes on to say... 'Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective...
  17. cliffed

    Main bonding to do or not to do

    Having to re cable the lighting in a metal portacabin,the cabin is placed in a workshop,would you main bond it,doubts due to new 18 th edition,on the requirements of main bonding. The cabin is not an extraneous conductive part,& will be earthed fortuitously by the lighting equipment.
  18. HappyHippyDad

    Does this require Main Bonding?

    The water pipes enter the house in metal, then there are a few cm's of copper after the stop cock and then plastic. It is hidden behind the kitchen draws (which can be removed to access). Does this require Main Bonding? The stop cock tests as 0.36Ω to earth, it is TNCS. I just cant see how...
  19. HappyHippyDad

    Main bonding and the new regulations.

    Evening all.. I am so used to the fact that there has to be Main bonding that I am struggling to not put it in in the following case: Incoming pipe is plastic. The builder has then fitted a plastic stopcock (inside the house) and then a mixture of plastic and copper from there (see pic). I...
  20. w0z

    TN-CS main bonding cable typical leakage current question.

    OK I'm prepared for the usual onslaught so here goes... I recently bought a clamp meter Uni-T UT210E. The first thing I did was check it out against my trusted AVOs and also a couple of other cheapo DMM's, (measure current through wire through probes and compare to clamp reading). The clamp is...
    • w0z
    • Thread
    • bonding cable current leakage main main bonding question tn-cs
    • Replies: 8
    • Forum: UK Electrical Forum
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