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main bonding

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  1. M

    Size of main bonding

    Okay chaps, I need a dispute settled so thank god that he created the iPhone. How do u work out the size of the bonding to the gas and water in an industrial premises? Any takers please Cheers Moosey
  2. M

    Main bonding value

    Hi all, just took main protective bond (10 mm) to water pipe which is of the old lead type. Main bond length is about 4 meters. Cross bonded to rads and sink(utility sink) Then did R2(using 2.5mm) to pipes under the kitch sink. Reading was 0.10 ohms. regs say max allowed value is...
  3. S

    Main Bonding

    Working at a house today that had a 10mm earth run to the main incoming water but then a seperate 10mm to the incoming oil. Just wondering if this should be just one continuous run going from cu-water-oil or is this acceptable?
  4. B

    no main bonding to water

    Evening all, bit late I know but... Just been to a house today and the owner (rental) wants me to do the remedial work thrown up by a PIR made by a different company. There are a few areas that need attention but one of the items on the list was no main bonding to water. There is 10mm main...
  5. C

    Maximum length of Main Bonding

    I did find the answer pretty much to this in an old thread & was answered by Chris... But wonder if I could get a few more suggestions as to being correct. Installed a Main Water Bond from a DB Board to the Main Incoming water supply which was (in my opinion) well over 25m away. We ran it along...
  6. B

    Plumber cut main bonding

    Alright fellas, Went out to wire in a boiler today and the plumber has cut the water main bonding:eek: to make "a bit of room" nice Can I make a joint and still comply? or do I have to run an unbroken cable? I was thinking possibly a crimp? any ideas?
  7. J

    Main Bonding Gas Supply

    Hi guys. I know this is an old question but after reading previous threads there still seems to be a lot of disagreement on the issue. I need to replace the CU in my mum's house but need to sort out the main bonding first, (there is none!!). The water is not a problem as it enters the property...
  8. P

    Domestic main earth and main bonding

    Just wondering what people generally do when these are missing or very old and obviously not up to the job. Do you put 16mm and 10mm in regardless or do you actually calculate it and see if 10mm and 6mm would satisfactorily cope. Reason why i ask is i was in a large diy store and was shocked at...
  9. R

    Main bonding not in place?

    Hi all. Just wondered what other sparky's view on where main bonding is not in place when you look at a job(no matter how small) ive been told buy my part p assessor that if the main bonding is not in place you should say to the customer that this needs to be done before any electrical work...
  10. R

    Testing Zs - disconnect main bonding or not ?

    Hi When measuring Zs on circuits do you guys leave the main bonding connected or disconnect it? Most of my testing books including GN3 say leave it connected, but another book by Anthony Hinsley says to disconnect it as it will introduce parallel paths (which I get) and that if left connected...
  11. Amp David

    Main bonding showing high resistance

    If doing a PIR, what code would you give if the main bonding is showing a resistance of 3.5 ohms.
  12. M

    6mm main bonding existing

    Would it be okay to use the existing the old green sleeved 6mm main bonding cable to gas/water as customer does not want any wiring or floorboards lifted up. Will i have to state this in the departures box or comments box that mainn bonding was not upgraded
  13. D

    Main Bonding to lightning conductors

    Hi all, New to this forum so I'll introduce myself as an electrician working for an NIC approved contractor in Sussex. Last week I did a PIR on a church and the only defect was a lack of main bonding to the lightning conductor. Bs 7671 lists this as a requirement but I cannot see why it is...
  14. H

    Main bonding

    Hi Gentlemen A question regarding bonding the main water. The main water pipe intothe property is lead and runs upstairs before any copper is fitted. What is the common practice with lead water pipes ?:confused: Thanks in advance for any advice...
  15. A

    Main bonding - bonded or not?

    So what is really deemed as an acceptable conitnuity on your 10mm main b and 16mm earth b then? So its continuous, but what do we need for speedy tripping etc then? Thanks guys! :confused:
  16. E

    Main Bonding Question

    I am sorting the wiring installation in my house, it is a Victorian terrace circa 1880. TT supply and the main gas incomer is at the front of the house and the main water incomer is at the back. It will be a massive problem to bond the incomers at 600mm of point of entry due to running in the...
  17. lurch

    Main bonding

    if gas and water main are adjacent to each other, is it still acceptable to run 1 x 10mm to both as long as there is no break in the cable?
  18. A

    main bonding to water pipe?

    Hello all, Mains incoming water pipe has been altered, there is about 12-15 inches of coppper pipe entering from the ground into the kitchen then around 3 - 4 mtrs plastic pipe before going back to copper piping, do I still need to bond the pipe and also a link between the plastitc to make...
  19. T

    10ml or 6ml main bonding conductors

    Hi guys :cool: I have carried out works on a kitchen, altered cooker cct, altered socket circuit to suit new lay out Installed rcbos to circuits as they have got socket outlets on them lest than 2oamps All tested ect 16ml main tails 16ml main earth now the main gas and water is only 6mml...
  20. U

    Main bonding to Alkathene water pipe.

    I wonder if someone could shed some light on the question of bonding a water main that is alkathene up to the point of entry to the building. The house is a new build and the copper pipe is not bonded. I would imagine that this is because it was not considered an extraneous conductive as there...

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