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  1. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    Hello everyone.
    I am due to take my practical exam for Level 3 on Monday but am totally unprepared. I seriously struggle to remember the safe isolation and testing procedures so literally ANY advice would be perfect right now.
    Thanks!
    Jake
     
  2. Pete999
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    Pete999 Trusted Advisor

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    Location:
    Northampton
     
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  3. Andy78
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    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
  4. Vortigern
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    Vortigern Electrician's Arms

    Location:
    England
    Business Name:
    F.H. Electrical
    Permission
    Identify Isolation point for circuit
    Switch off, Lock off, post notice
    Use two pole voltage tester
    Test on known live
    test on circuit worked on
    If Dead, test on known live again
    All clear? Start work.
    Btw when doing practical they look for Live on last and off first in every combo.
     
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  5. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    That's so simple! Also in what order do I test in? My mind is totally blank and sadly it had to happen just days before my exam
     
  6. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    Thank you by the way, didn't mean for my response to come across without seeming grateful
     
  7. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    when locking off don't forget to put the key in your pocket .
     
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  8. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    good luck with the exam.
     
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  9. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    Thank you! Hopefully it goes well
     
  10. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    don't let the nerves get the better of you ,and let us know how you got on .
     
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  11. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    I will definitely let you know. Thank you for the support!!
     
  12. Antony1
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    Antony1 Guest

    Switch off loads then switch off supply, remove cover from board, install lock off device and sign put the key in your pocket or that's a fail!

    Then 12 point test, if you don't count 12 you have missed 1 and it is a fail

    1- test lamps in proving unit
    2- L1 to earth
    3- L2 to earth
    4- L3 to earth
    5- L1 to neutral
    6- L2 to neutral
    7- L3 to neutral
    8- L1 to L2
    9- L2 to L3
    10- L1 to L3
    11- neutral to earth
    12- test lamps in proving unit
     
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  13. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    Would these steps be relevant to all circuits?
     
  14. Antony1
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    Antony1 Guest

    the steps I posted are if your isolating a three phase board at the main isolator, remember to test on the primary side of the isolator where the cable comes in!

    These steps are the same if your isolating a 3 phase circuit and for a single phase circuit, L-N, L-E and E - N test lamps before and after!

    Do you have an on site guide? All the diagrams in there for testing with good pictures
     
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  15. Jay Sparks
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    Jay Sparks Trusted Advisor

    Location:
    Bratford
    Don't forget your PPE. Some colleges require you to select appropriate PPE like rubber gloves (marigolds), googles/safety glasses, stand on rubber mat (usually provided) etc. Sometimes it will be a black test box that you test at, not the actual isolater/mcb but the tests as described above are the same.

    Jay
     
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    Last edited: Feb 17, 2017
  16. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    I'll get all the steps written down to better prepare myself. I do indeed have the OSG so I'll give it a read to see if that helps
     
  17. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    I was wondering if any specific PPE was required but if so they I will be able to find it at college
     
  18. Pete999
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    Pete999 Trusted Advisor

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    Location:
    Northampton
    Have you not got any yourself?
     
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  19. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    I do but do not have any goggles/safety glasses or gloves
     
  20. Richard Burns
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    Richard Burns Trusted Advisor

    Location:
    Cambridgeshire
    Business Name:
    Richard Burns
    Pocket Guide 5 gives information on safe isolation.
     
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  21. Jay Sparks
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    Jay Sparks Trusted Advisor

    Location:
    Bratford
    The college will usually put the PPE on a table along with different test equipment, lock off devices etc.

    Jay
     
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  22. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    Deleted ,not appropriate for this thread
     
  23. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    Luckily just found my pocket guide!!
     
  24. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough

    That is really helpful then. A lot of people have said that the testing itself is fairly simple and to remember R1+R2 test method 1
     
  25. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    Remember a golden rule that applies throughout the testing regime,test (and null where necessary) your instruments before using or relying on their readings or values
    The safe isolation test you mentioned is half to do with testing the instrument before actually relying on it to give an accurate result
     
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  26. Jake Wesley
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    Jake Wesley Trainee Access

    Location:
    Peterborough
    Might sound silly but when would I null the test instrument? I assume it'd come be after lock off but I may be wrong?
     
  27. Pete999
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    Pete999 Trusted Advisor

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    Location:
    Northampton
    What instrument are you using? cant see how you are going to null a voltage indicator, it will either indicate a voltage or it wont. You prove whether it is working by using a proving unit.
     
    Last edited: Feb 18, 2017
  28. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    Please remember what you asked in the opening question

    The lad wanted tips on testing procedure,he would be, or at least should be, aware of the functions and operating procedure of each instrument/range:rolleyes:
     
  29. Pete999
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    Pete999 Trusted Advisor

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    Location:
    Northampton
    Fair enough, although the original question focused on the safe isolation procedure, which was why I made the valid point that a voltage indicator is what it is and cannot be nulled, Jake's answer as to whether he should null the instrument after lock off, seemed to me at least he thought the point you brought up about null as required, indicated to Jake that the Voltage indicator should be nulled, my reply was meant to assure him that there is not a need, or more importantly no method to null a VI, also I made the point that a VI is proved before and after use. I'm sorry if that offended anyone, most of all Jake.
     
  30. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C

    I have quoted my own post because.in fairness to Pete,although no criticism would be reasonable or even intended of himself,I can see where twisted knickers have been introduced to the thread

    Having re read my own post,I can see where Jake has mistakenly assumed the 2nd part was indicating a voltage tester
    The safe isolation procedure "is"part self test of the instrument,however, it will of course have no relevance to adjusting/nulling applicable to other test procedures

    I am also sorry for any confusion he may have been presented by myself
     
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  31. hightower
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    hightower Electrician's Arms

    Location:
    Durham
    For testing order I learned it years ago using Alan Lynchs 'CRIPPER'

    CRIP are dead tests, PER are live tests. So in order:

    CONTINUITY of protective conductors (earthing bonding and cpcs etc)
    Continuity of RING finals (3 stage test)
    INSULATION resistance
    POLARITY (although will be confirmed throughout continuity tests in reality)

    POLARITY (live tests now, this tests incoming supplies polarity)
    EARTH fault loop impedance (including pfc)
    RCD tests

    Then finish off with functional testing
     
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