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Further investigation IR below 2 Megohms or 20 Megohms??

RobW

Has the guidance on minimum insulation resistance changed in the new OSG?? I subscribe to the IET electronic versions, the current online IET OSG says that further investigation is required below 20Mohms rather than the previous versions advising further investigation below 2 Megohms? Is this just an electronic typo or has thid guidance changed.

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  • 0

    Ah thanks, perhaps I should update my notes... ;-)  Mind you I bet I can damage a cable in a way that still passes at 20Meg as well as at 2. If you can, nothing beats a visual check before boxing or plastering things in.

    Mike.

  • 0 in reply to mapj1
    mapj1 said:
    Mind you I bet I can damage a cable in a way that still passes at 20Meg as well as at 2.

    Definitely ... even perhaps using a techs screw to penetrate just the line conductor in a flat T&E cable, making the steel frame of a steel-framed plasterboard wall live in the process, which then doesn't come to light until someone kneels in a puddle of water that's seeped under the wall, killing a plumber who was fixing the leak.

  • 0 in reply to gkenyon

    A non compliance with 522.6.203 and 522.6.204 then.

    Z.

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  • 0 in reply to gkenyon

    A non compliance with 522.6.203 and 522.6.204 then.

    Z.

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  • 0 in reply to Zoomup

    Yes, but still happened in real life in the UK, possibly preceding current 'rules', and not identified by testing (apparently)

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