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Discuss Earth bond clamp for oil pipe in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. dnjr
    Offline

    dnjr Electrician's Arms

    Location:
    South coast
    Dear All
    Got a board change to do where there is an incoming oil pipe.
    Plastic tank with PVC covered copper pipe most of the way. Comes inside and its just copper coming up through the floor. Did an IR test and got 0.00 so it needs bonding ( as I understand it its got to be under 0.02 to not need bonding)
    Problem is the pipe is only about 8 or 9 mm dia. and i cant find a small enough clamp.
    Someone suggested either a P clip or strap banding but they dont seem very professional. what are people using please
    cheers
    dnjr
     
  2. westward10
    Online

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    You can get Ezybond clamps but they only go down to 15mm from what I have seen. There are rumours these are not in compliance with BS951 but I believe the manufacturer has resolved this.
     
  3. dnjr
    Offline

    dnjr Electrician's Arms

    Location:
    South coast
    Hi Westward. Yep seen them but as you say dont go small enough. I cant be the only person needing to bond oil pipes. there must be something out there....
     
  4. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    bare copper p-clip is the answer. 4mm brass nut & bolt with a lug on the bonding cable.
     
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  5. Wilko
    Online

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
  6. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    you can't over tighten them things. the bolt will shear before it crushes spaghetti.
     
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  7. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    You might want to check your maths there!
     
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  8. dnjr
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    dnjr Electrician's Arms

    Location:
    South coast
    teach me to read first
    IR was 0.00M ( as I understand it , if its below 0.02M then it needs bonding if its above 0.02M then no need. Think I meant to put Over 0,02 but typed under...
    Am I right this time davesparks ?
     
  9. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    over 0.22Meg means it's not extraneous and does not need bonding. if under that, a continuity test is required from pipe to MET. a reading below 1.0 ohms suggests that it is bonded through other services, e.g.water and may not need additional bonding.
     
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  10. dnjr
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    dnjr Electrician's Arms

    Location:
    South coast
    Hi Teletrix
    I thought it was 0.022M ( 22000 ohms)
    over that dont bond under that and it needs bonding
    I did a continuity test and got 0.06 ohms I had it in mind it had to be below 0.05 to be acceptable (GN3) could be wrong, its been a long day
    I cant find either a oil pipe bond or a water pipe bond so getting worried and going belt and braces
     
  11. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    that 0.05 figure has to be the most misquoted figure of all time. it's the max. resistance betweem a bonding cable and the pipe to which it is bonded. I.E the resistance across the bonding clamp from cable to pipe.
     
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  12. Risteard
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    Risteard Electrician's Arms

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    Precisely. It's just to demonstrate that the clamp is adequately connected to the pipe!
     
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  13. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    Also including some clue as to the units is quite important, I didn't quite register that you used an IR tester and was thinking in ohms.

    My opinion on this subject is not exactly in line with the popular opinion on the forum, I'm inclined to interpret the regulations as requiring incoming services that be bonded at point of entry.
     
    • Like Like x 1
  14. sparkdog
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    sparkdog sparkdog Electrician's Arms

    Location:
    Sunny Sussex
    Business Name:
    C MacRae Electrical
    I usually manage to fit a standard earth clamp to an oil pipe.
     
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  15. dnjr
    Offline

    dnjr Electrician's Arms

    Location:
    South coast
    I've tried. Just too big for this one.
     
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