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Discuss Minor works R1+R2 measurement in the Electrical Courses & Electrical NVQ's area at ElectrciansForums.co.uk.

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  1. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    I think I may have asked this question a while ago but not sure on what the answer was and it's come up again at our monthly tool box talk.

    When doing a Minor works for an additional spurred socket or extra light fitting on a circuit, should the R1+R2 measurement be taken from the protective device or the socket/fitting you have spurred from?
     
  2. telectrix
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    telectrix Scouser and Proud of It Respected Member

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    Location:
    cheshire/staffordshire
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    the R1+ R2 should be for the whole circuit.i.e. from the OCPD in the DB to the furthest point.
     
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  3. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    Is there any literature (regs/onsite guide) to support this?
     
  4. spinlondon
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    spinlondon Forum Mentor

    Location:
    Harlow Essex
    Why would you be recording the R1+R2?
    What is the purpose behind it?
     
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  5. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    It's part of the minor works testing schedule on our guardian minor works
     
  6. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
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    You nee to ensure that the circuit you are adding, altering etc is correct, if the RFC you are adding a spur to, and the R1+R2 was suspect, indicating that maybe it is not wired correctly, then adding a new spur may not be the best option, that's how I read it Spin.
     
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  7. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    Wouldnt it be easier to just do a Zs? If that complies, then the R1+R2 value must be acceptable?
     
  8. westward10
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    westward10 In echoed steps I walk across an empty dream. Staff Member Moderator

    Location:
    Northamptonshire
    18th Ed MWC asks for continuity readings as well as Zs.
     
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  9. Pete999
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    Pete999 Forum Mentor

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    Agree Mate, but the question the OP posed, or at least I think this what he is asking, is would you need to take continuity readings of just the new cable installed, or the continuity of the new and existing circuit, my thoughts are post 6.
     
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  10. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    Exactly that Pete.
     
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  11. essex
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    essex Forum Mentor

    Location:
    Wiltshire
    I think Spin is trying to point you in the direction of finding the answer yourself.

    What is the reason we carry out R1+R2 testing?
     
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  12. essex
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    essex Forum Mentor

    Location:
    Wiltshire
    I think Spin knows the answer but is trying to help the Trainee.
     
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  13. essex
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    essex Forum Mentor

    Location:
    Wiltshire
    What is the purpose of R1+R2 testing?
     
  14. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    To confirm continuity and polarity
     
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  15. spinlondon
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    spinlondon Forum Mentor

    Location:
    Harlow Essex
    Ok, if it’s just to fill out the form, then you should do what the form asks, which is to record the value of R1+R2 for the circuit which has been altered or extended.
     
    • Agree Agree x 1
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