main bonding

main bonding

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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. D

    Running main bonding outside

    Had a CU upgrade just over a year ago but the electrician didn't upgrade the main bonding to the water from 6mm to 10mm. I don't know his reasoning, wasn't there for the work and never chased it up. I'm having my garage converted so access to the CU is going to be restricted after the ceiling...
  6. captaincaveman

    Main bonding with metal water incomer but plastic installation

    Hi. Quick question. Domestic property recently rewired by niceic spark. Water incomer is metal for about 3 feet into the property (celar) but the rest of the water installation is plastic. Looks like during the rewire the water bonding was broken on purpose. Does it need to be bonded again? (My...
  7. B

    Main bonding flow and return to oil boiler

    Hi this is pickling my head and any advice is appreciated. I have a TNCS system. I have an external oil boiler fed from the house in a detached garage. The main water in the house and the flow and return from the boiler are all bonded back to the house MET from within 600mm of where they...
  8. Dave301

    Main Bonding

    House has had gas installed. Meter is outside of property at front. The box is not attached to the building and the gas pipe enters the property under the floorboards. The pipework goes to the boiler at the rear of the property under the floor the whole way. Is it OK to put a bonding clamp...
  9. HappyHippyDad

    No main bonding seen but good continuity.

    Evening.. I have just completed an EICR. The incoming gas pipe has been hidden behind kitchen units. I have dismantled the plinths, emptied the cupboards and used my inspection camera all to no avail. I cannot see any main bonding. I can just get my hand through an inspection hole cut in the...
  10. C

    main Bonding of Water Pipe - supply not unique to property - Potential difference?

    Hi, I understand according to 411.3.1.2, that main metalic services incomming must be bonded to MET. but what if the water pipe is shared from another property? The premises has its own electrical supply, but the incoming water is not individual but shared. I believe i should still Bond. Could...
  11. F

    TT system main bonding CSA?

    Rewiring an older TT terraced property. There is currently 6mm earthing from the rod, and also as main bonding to gas and water. I (was!) confident that 6mm main bonding met the requirements of BS7671, but a fellow Part P installer insists that I need to upgrade the main bonding to 10mm, but...
  12. G

    Bathroom light ip and main bonding?

    If a bathroom light is out of the zones but directly above the shower does this not need up rating? Eicr no code? Main bonding to water and gas tncs must be half of the supply neutral. Do you count the incoming cable to the service cutout as the incoming? Or the tails from top of cutout to...
  13. L

    Main bonding at outbuilding

    Hi all, I have a commercial premises (school) that requires installation of main bonding at a block which is an outbuilding from the main school. Now the bonding in the main school is 50mm, however the cable feeding this outbuilding is just a 25mm 4core. So what size should I be using...
  14. U

    Main Bonding plastic pipes

    Hi again, a kitchen has been ripped out, the main water stop was in there. it was all lead and copper water pipes and a main bond was to be run. However matey has lopped these pipes off and left about 4 inches of lead pipe coming in and then gone and replaced with plastic pipes. so would the...
  15. B

    main bonding

    Just a quickie, is there anything in the regs that says a main bonding cable cannot be joined? I have installed one for an oil pipe which has now been moved...
  16. 2

    Main bonding upgrade and cu stickers?

    Hi, i am new here so sorry if this is in the wrong forum. I am a time served electrician and have been laid off so i am taking the jump to setting up on my own. I have been mainly commercial and industrial with only small amounts of domestic work. I have got a job coming up next week that i wish...
  17. G

    2 x 6 mm as main bonding ?

    Hi all ,got a tricky install as I cant get back to mains and they are having a bathroom refit , I've got 2 , 6 mm earths runing in to roof space can I double these up and use for a main 10mm bond? Cheers grand
  18. I

    main bonding conductors

    hi can anyone tell me the what the maximum value of a main protective bonding conductor is
  19. B

    Fitting a DB without updating the main bonding.. Bad crack or safer than before?

    This thread will probably cause outrage but here goes.. Changes a DB a year ago from my 89 year old gran, She is proud of here house and spent a load on it recently doing it up.. Well I say loads... The electrics aint been touched in aged and well to be fair needed a test.. Giving she lives a...
  20. G

    main bonding

    We carried out a small installation job ,connecting 3 new circuits to an existing db,on one of the upper floors of a large multi occupied building.We were informed at the time that all existing services had been tested upto date,but we were unable to gain access to the incoming mains to verify...

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