1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

2391 practical efli

Discussion in 'Electrics UK' started by andy1984, 16 Aug 2006.

  1. andy1984

    andy1984

    Joined:
    3 Aug 2006
    Messages:
    34
    Thanks Received:
    0
    Country:
    United Kingdom
    hi,

    got a question about my upcoming 2391 practical.

    one of the tests is an earth fault loop impedance test where you have a socket mounted on a block off wood( to plug your tester in) along with 3 switches.

    the socket plugs into a 230v socket(via a flex cable and 3 pin plug) to get its power and the 3 switches put different values onto the socket where you plug your tester in.

    one of the switchs gives a situation where no earth is connected and i was told that you should not proceed with the test in this situation, can anybody explain why?

    and also my megger mft1502 automatically starts testing when voltage is detected so surrely it will start immediatelly when i hit the switch with no earth,thus failing me?????

    please help, am confused!!!
     
  2. Sponsored Links
  3. ebee

    ebee

    Joined:
    14 Aug 2005
    Messages:
    1,713
    Thanks Received:
    29
    Location:
    Lancashire
    Country:
    United Kingdom
    Many modern meters check for voltage and will not allow a test if none present so earth not present should prevent the test taking place anyway.
    If yours starts automatically then I would think it willl not if earth missing.
    on the older meters you were supposed to notice this - some had two lamps Ph/N & Ph/E and only if both lit do you press the button to test
     
  4. Spark123

    Spark123

    Joined:
    2 Jun 2005
    Messages:
    14,841
    Thanks Received:
    474
    Location:
    Cumbria
    Country:
    United Kingdom
    If there is no earth connection when the test current is applied the exposed conductives can become live at near mains voltage, as ebee says modern testers won't allow you to do the test. iirc they also stop the test if the voltage increases above 50v, but I could be getting mixed up with something else.
     
  5. rockenroll

    rockenroll

    Joined:
    3 May 2008
    Messages:
    20
    Thanks Received:
    0
    Location:
    London
    Country:
    United Kingdom
    How other mates wrote u before, many modern meters check for voltage and will not allow to test if earth is not present. I ve got MFT 1553 and I ve done home EFLI correctly and after without earth(with earth leed connected to some metal wich is not earted ex. bath tub wast), the meter will show you on the screen ERROR and all circle signs for polarity full, as u know a good polarity is when u have marked just between P and N, in this case u will have polarity marked for P, N, CPC - ERROR

    Cheers
     
  6. Spark123

    Spark123

    Joined:
    2 Jun 2005
    Messages:
    14,841
    Thanks Received:
    474
    Location:
    Cumbria
    Country:
    United Kingdom
    Have I really been here this long? :LOL:
     
  7. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    73,445
    Thanks Received:
    4,228
    Location:
    Crossgates, Europe
    Country:
    Cook Islands
    "Resurrection"
     
  8. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  9. Sponsored Links
Loading...

Share This Page