main bonding | Page 4

main bonding

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  1. J

    Main bonding conductors

    Hi i was looking for some technical advice please. I have currently been asked to do work in a agricultural college to put a socket in a horticultural green house. The main college is supplied by a Scottish power transformer it is a TNS system,so the main bonding conductors are 25mm2. Now the...
  2. J

    Main bonding requirements - where is the MET

    Should the MET be the earth point in the CU, with a separate single cable (10mm) run to gas, and electric meter, or could the MET be 8 way earth block on the meter board with a 10mm cable run to consumer unit, and water stop tap. Should the CU be connected by a 10mm, 16mm, 25mm earth cable on...
  3. N

    Main bonding

    Hi I am doing a CU change and have 10mm gas bond direct to the MET. There is no conductor back to the MET for water but it is bonded in 10mm and there is continuity back to MET. I know this is acceptable if the conductor is not cut but I know it is, should I run a new 10mm conductor from...
  4. C

    Main Bonding

    Question on Main Equipotential Bonding for LPG Gas feed on domestic property - Plastic tank buried away from the house, PVC feed pipe to the external wall of the house and Copper pipework to the boiler - do I need to provide a main bonding earth to the pipework????????????
  5. J

    No main bonding

    Hi guys, just done a pir on a house it had no bonding to water or gas what code would you give it a 1 or a 2, the esc best practice says a 2 i think maybe a 1. Cheers, John.
  6. C

    Main bonding

    Hi all Doing Periodics for a management company, all of them are landlord supply only. I come from more of an industrial background, and have not been involved with residential installation work for a long time. Me question is regarding main bonding, I keep seeing sites where there is no...
  7. sparky3366

    Unable to upgrade/add main bonding?

    What happens when you go to a job to wire a boiler and there is no way to get a 10mm to the gas meter or water stop tap? If I had to run a new supply instead of using existing, how do I stand? on an old TT system that is in need of serious work, rcd not working (!!!) and old black wylex 4 way...
  8. S

    main bonding of water mains

    Hi all I'm on a job now where there is more than one water main coming into the property as it was three small cottages now it's one. I just need to confirm that i have to bond all main services into the property. thanks john
  9. C

    How do you test main bonding when it's several meters long?

    CU in hallway, water pipes into house are out the front door and round the other side of the house. Probably a 6 -7m main bonding conductor. a) Is this safe? b) Is there a way of testing it without using really long leads? Cheers, Ahab
  10. W

    Routing of 'Main Bonding Conductor'

    Hi, I'm replacing a Main Bond to Water which needs to run across a kitchen. The ideal route would be straight across the floor because, at the moment, it is yet to receive a final 'skim' of 50mm and will then be tiled over. Is it acceptable to run it like this - which I suppose is similar...
  11. W

    Running Main Bonding Externally

    Hello All, Been asked to change some bathroom lights and other jobs at an old house recently but preliminary inspection shows there is no main bonding in the property. Unfortunately the incoming gas is one side of the house and the water the other, both in the middle and the CU and meter at...
  12. S

    Main bonding

    Hi all Water, gas, oil ext. should be bonded within 600mm as it comes into the property, also before pipe tees off. In a commercial building can you main bond the water pipe say 30m in, as long as good continuity and readings are ok (below 0.05)
  13. S

    Why 0.05 Ohms for main bonding conductors?

    Hi all, This has been bugging me for a while, so can anyone explain how we arrive at the value of 0.05 Ohms as the maximum acceptable value for resistance of main equipotential bonding conductors? Is there a calculation with 0.05 or less as the answer? Or is the idea just to keep it as low as...
  14. E

    Main Bonding/ rcd and minor works?

    Hi all...I'm just using my mate eyeball account to post a question...If I go into a old property and the customer wants some extra sockets putting in and you take a look at the main earth bonding which is present but inadequate due to the size. 1..Do i need to update the main earth bonding or is...
  15. N

    main bonding to external boilers

    Ip 65 rated boiler sat on concrete slab next to building.flow and return pipe leaving boiler,entering building without contact with soil.main bonding or not ?
  16. S

    routing of main bonding?

    I have eventially decided to get regestered with elecsa for domestic, I am doing a new cu tomorrow and as I am wanting to use it for assesment just want to make sure on bonding as now he wants that doing too. The house has just been all done up and question is about routing as i am sure he won't...
  17. S

    Main bonding 0.05?

    Hi guys New to the forum, been reading posts the last few days and everyone seems to be helpful and friendly here so I was hoping someone could answer my question. Have installed a main bonding conductor from the water pipe to the MET. The Length of the main bonding is approx. 7m. When doing...
  18. C

    Measuring PD of Main Bonding

    Hi All, I have a fairly large site that is fed by two seperate supplies via PME on both. If the supplies are feeding two sides of the same premisis there could be a potential difference between the main bonding from both supplies. How would I measure the PD between the two different main...
  19. B

    Main bonding cable route

    Hi All Just wanting a bit of advice on how to route a main bonding cable. The layout of the property is Water Mains enters in the kitchen Gas mains enters under the stairs in the hallway CU installed in Kitchen cupboard Elec Meter installed in a separate cupboard under stairs My thoughts...
  20. R

    No Main Bonding to Gas/Water

    Hi Guys, I have an ergent problem, my usual contractor asked me to wire a new boiler he was installing, and i forgot to check the main bonding before commencing works! I have only replaced a single socket outlet with a s/f spur and connect the a flex to the boiler and upgraded the...

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