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Electrical Inspection & Testing Forum
Unexpected Reading Between Earth And Neutral
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<blockquote data-quote="not_shocked_yet" data-source="post: 382738" data-attributes="member: 25580"><p>Hi Pro Dave,</p><p></p><p>Reading should be 1 M ohm or greater however it is accepted that in the field a measurement above but close to this number should still be considered a fault. The lower the Mohm reading the less resistance is being found - the resistance of the conductor if insulation is good should be high as it is not a good conductor of electricity. So, a low reading tells me that the insulation has deteriorated to an extent that more current is leaking from the L conductor to E conductor than would be the case if the insulation was good (accepted that there will always be some current leakage as all materials are conductors - some just really not very good). Or a conductor(s) may have become loose and are closer to each other than they should be. </p><p></p><p>The lower the reading value the worse the condition(s) above will be.</p><p></p><p>The imbalance registered at the RCD will cause it to operate.</p></blockquote><p></p>
[QUOTE="not_shocked_yet, post: 382738, member: 25580"] Hi Pro Dave, Reading should be 1 M ohm or greater however it is accepted that in the field a measurement above but close to this number should still be considered a fault. The lower the Mohm reading the less resistance is being found - the resistance of the conductor if insulation is good should be high as it is not a good conductor of electricity. So, a low reading tells me that the insulation has deteriorated to an extent that more current is leaking from the L conductor to E conductor than would be the case if the insulation was good (accepted that there will always be some current leakage as all materials are conductors - some just really not very good). Or a conductor(s) may have become loose and are closer to each other than they should be. The lower the reading value the worse the condition(s) above will be. The imbalance registered at the RCD will cause it to operate. [/QUOTE]
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