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insulation resistance testing
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<blockquote data-quote="Janice" data-source="post: 58308" data-attributes="member: 2589"><p>I maybe wrong but I get the impression that everyone is missunderderstanding the original post. Kung thought that by testing the circuit at 250v, then the 0.5Mohms reading was OK.</p><p></p><p>This is not the case. The circuit (if I read it correctly) is an LV circuit - 51v a.c to 499v a.c - and the insulation values given in table 61 of the bible are for the different voltage bands.</p><p></p><p>Because it is a 230v circuit, it should be tested at 500v d.c and the min. value of insulation resistance should be 1Mohm. However, doing a preliminary test at 250v d.c to protect the circuit STILL requires an insulation resistance of 1Mohm, not 0.5Mohm as has been suggested.</p><p></p><p>The 0.5Mohm value is only valid for a SELV circuit, regardless of the test voltage.</p><p></p><p>Probably as clear as mud..Blushing</p><p></p><p>J</p></blockquote><p></p>
[QUOTE="Janice, post: 58308, member: 2589"] I maybe wrong but I get the impression that everyone is missunderderstanding the original post. Kung thought that by testing the circuit at 250v, then the 0.5Mohms reading was OK. This is not the case. The circuit (if I read it correctly) is an LV circuit - 51v a.c to 499v a.c - and the insulation values given in table 61 of the bible are for the different voltage bands. Because it is a 230v circuit, it should be tested at 500v d.c and the min. value of insulation resistance should be 1Mohm. However, doing a preliminary test at 250v d.c to protect the circuit STILL requires an insulation resistance of 1Mohm, not 0.5Mohm as has been suggested. The 0.5Mohm value is only valid for a SELV circuit, regardless of the test voltage. Probably as clear as mud..Blushing J [/QUOTE]
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