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Do-It-Yourself (DIY) Question & Answer Forum
Installation Resistance Readings..
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<blockquote data-quote="Blue Duck" data-source="post: 393881" data-attributes="member: 8071"><p>The INSULATION resistance test is essentially testing the quality of the conductor insulation, be it PVC, rubber or even magnesium oxide.</p><p></p><p>The higher readings are what is desired &gt;250Mohms &gt;500Mohms or infinity depending on how you tester works.</p><p></p><p>Low readings are in indication of a fault or the insulation breaking down. BS7671 defines this as &lt;1Mohm but in reality a low reading should be investigated.</p><p></p><p>Low readings are usually caused by damage to cables, cables poorly installed in accessories, faulty accessories, damp and flora n fauna.</p><p></p><p>A reading of 175Mohms is fine but could be damp a reading of 0.75Mohms could be a cable physically damaged.</p></blockquote><p></p>
[QUOTE="Blue Duck, post: 393881, member: 8071"] The INSULATION resistance test is essentially testing the quality of the conductor insulation, be it PVC, rubber or even magnesium oxide. The higher readings are what is desired >250Mohms >500Mohms or infinity depending on how you tester works. Low readings are in indication of a fault or the insulation breaking down. BS7671 defines this as <1Mohm but in reality a low reading should be investigated. Low readings are usually caused by damage to cables, cables poorly installed in accessories, faulty accessories, damp and flora n fauna. A reading of 175Mohms is fine but could be damp a reading of 0.75Mohms could be a cable physically damaged. [/QUOTE]
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