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Discuss Testing ze at the origin in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

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  1. joel89
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    joel89 Regular EF Member

    Hi all I'm an industrial sparky on maintenance doing my eal initial verification exam tomorrow was just wondering when doing ZE at the origin, do you do Neutral L1,L2,L3 and then Earth L1,L2,L3 and N+E ? Or is there between phases too? And is this the same for The PFC?
     
  2. nickblake
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    nickblake Trusted Advisor

    Earth L1,L2, L3 and put the highest reading down and should be done with the power switched off and the main earth disconnected to eliminate parellel
    earth paths
     
  3. joel89
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    joel89 Regular EF Member

    Thanks Nick. Just for the ZE this yes? What about the PFC.? So I'll drop croc clip on earth incomer after disconnection and goes across phases yes?
     
  4. Leesparkykent
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    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    What tester are you using? Some testers require you to use the 3rd lead.
     
  5. ian.settle1
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    ian.settle1 Trusted Advisor

    Location:
    Wirral
    Bit late to ask now isn't it?
     
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  6. joel89
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    joel89 Regular EF Member

    It' begins with an M can't think off top of my head it's not megger, it's what the training centre borrowed us, it's on a domestic rig im involved with control panels mainly on the industrial side. Do a bit of installation work just never really done testing since college 7years ago!
     
  7. joel89
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    joel89 Regular EF Member

    I've done a bit on the rig the lecturer is a bit useless so I'm just writing down the test sequence and procedure just memorising for the morning
     
  8. joel89
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    joel89 Regular EF Member

    It's metrel multifunction tester jus come to me
     
  9. Leesparkykent
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    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    this one?
     

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  10. joel89
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    joel89 Regular EF Member

  11. newtothis
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    newtothis Electrician's Arms

    Location:
    East Sussex
    Ole !
    I've been getting to do ZE tests. :stooge_curly:
    Using a megger has a 2 lead option and it gives you the Prospective Fault Current (PFC) at the same time.
     
  12. Andy78
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    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
    You might want to rethink using a PEFC value gained during the Ze test.
     
  13. Simonslimline
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    Simonslimline Electrician's Arms

    Location:
    South West, Bath
    Your PFC is going to be the highest Line to Neutral reading multiplied by 1.732, or doubled to be on the "safe side".
     
  14. Pete999
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    Pete999 Trusted Advisor

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    Northampton
    https://www.youtube.com/watch?v=PUTn3t65na4
     
  15. newtothis
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    newtothis Electrician's Arms

    Location:
    East Sussex
    Sorry - the question is about 3 phase.
    Running for the hills :)
     
  16. Andy78
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    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
    Or measured directly line-line.
     
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  17. Simonslimline
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    Simonslimline Electrician's Arms

    Location:
    South West, Bath

    Yeah as long as the tester is suitable to measure across Lines. :)
     
  18. Andy78
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    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
    The OP's certainly is.
     
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  19. GB.Kayak
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    GB.Kayak Electrician's Arms

    Why would you want to rethink? Are you referring to the fact that the fault current under short-circuit conditions in a 3-ph system is significantly higher than the line-earth fault current?
     
  20. spark 68
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    spark 68 Electrician's Arms

    Location:
    UK
    No mate, it is because PEFC is taken with all bonding conductors and CPCs connected, Ze is taken with the Earthing conductor disconnected from the rest and measured on it's own.

    PSSC is a different measurement. ;)
     
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  21. Andy78
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    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
    What that guy said ^
     
  22. GB.Kayak
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    GB.Kayak Electrician's Arms

    In principle then, the earth loop resistance with the earthing conductor connected may be lower due to parallel paths; therefore, the PEFC may be higher. The same measurement configuration for the meter, but 2 different configurations for the electrical installation. Ze without earthing conductor connected, and PEFC with the earthing conductor connected!

    Hope that is correct, thank you for refreshing my memory or correcting my understanding!
     
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  23. joel89
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    joel89 Regular EF Member

    I passed the practical and failed the theory so have to do a re-sit doh !
     
  24. Risteard
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    Risteard Electrician's Arms

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    Indeed, and the Prospective Fault Current (PFC) is the greater of the PEFC and the PSSC. It's amazing that people think that PFC is synonymous with PEFC or PSSC. (Not directed at you as you clearly understand the difference!)
     
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