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Electrical Inspection & Testing Forum
Insulation resistance test on live circuit
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<blockquote data-quote="Davethsparky" data-source="post: 418697" data-attributes="member: 27165"><p>I don't think it is possible to establish the insulation resistance of the wiring with a load connected as you will never be able to eliminate the insulation resistance of the load. However you can establish a probable value of the IR to earth of the wiring and the load combined, however it will not be exactly correct.</p><p></p><p>By measuring the earth leakage with a clamp meter around all live conductors you can then calculate what insulation resistance would allow that leakage current to flow. But the type of load may have a normal earth leakage current which will bias the result. </p></blockquote><p></p>
[QUOTE="Davethsparky, post: 418697, member: 27165"] I don't think it is possible to establish the insulation resistance of the wiring with a load connected as you will never be able to eliminate the insulation resistance of the load. However you can establish a probable value of the IR to earth of the wiring and the load combined, however it will not be exactly correct. By measuring the earth leakage with a clamp meter around all live conductors you can then calculate what insulation resistance would allow that leakage current to flow. But the type of load may have a normal earth leakage current which will bias the result. [/QUOTE]
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