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Discuss insulation resistance testing question in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. paulthemagpie
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    paulthemagpie Regular EF Member

    Location:
    North
    If some of the circuits of a shower block for a big site have been tested for insulation resistance during constuction.

    what is the possible effect that insulation resistance testing the whole installation when completed have on values obtain on completion compared with for those circuits when tested individually?
     
  2. spark 68
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    spark 68 Electrician's Arms

    Location:
    UK

    The IR test results will come back lower, because you have more cables and therefore more leakage paths.

    As an additional piece of information, it may not be possible now to do the L-L IR test, only the L+N to E test, either due to vunerable equipment and/or Neon indicators.
     
  3. Knobhead
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    Knobhead Guest

    Paul, do you do any of your own homework?

    With the questions you ask, i doubt a company would let you loose on site.
     
    • Like Like x 3
  4. paulthemagpie
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    paulthemagpie Regular EF Member

    Location:
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    most of the questions im on the right track or already no it, just want to check it with senior electricians like yourself
     
  5. Knobhead
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    Knobhead Guest

    Try showing you've put some thought in to it. You may get some help then.
     
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  6. Mark_Burgess
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    Mark_Burgess Electrician's Arms

    Location:
    ..........
    I suggest you start putting your answers, first of all, in the thread after your question each time, people will tell you if you are right or wrong.
    All you are doing is alienating yourself from people willing to help, it seems like you want an easy way of getting homework answers.
     
    • Like Like x 2
  7. Paul.M
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    Paul.M Electrician's Arms

    Location:
    Lost in Space
    I wish this forum was around when I was at college. I would have spent less time in books and more time in the pub.
     
    • Like Like x 1
  8. GaryM
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    GaryM Guest

    Paulthemagpie, think of resistors in parallel.
    What's the value expected collectively if you have four circuit's measuring 350Mohm, 320Mohm, 290Mohm and 176Mohm?
     
  9. spark 68
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    spark 68 Electrician's Arms

    Location:
    UK
    Sorry chaps,

    I did not realise it was a homework question, I actually thought it was a genuine request for help.

    I don't usually just give out the answers, and like most of us on here just normally give helpful hints, or references.
     
  10. trev
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    trev Regular EF Member

    Paul, apart from anything else that has been said above, if you take a little time to think this one out you will get the answer. It's easier than you think
     
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