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Do-It-Yourself (DIY) Question & Answer Forum
Low IR reading on ring main
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 86845" data-attributes="member: 250"><p>Not withstanding the point that the IR test is actually being done with an instrument that generates either...</p><p></p><p>250v DC</p><p></p><p>500v DC</p><p></p><p>or</p><p></p><p>1000v DC</p><p></p><p>in accordance with the appropriate nominal circuit voltages, as per table 61 on page 158 of Big red!</p><p></p><p>you is either going to be looking at</p><p></p><p>250v DC / 3.65Mohm = 0.0000684 amps</p><p></p><p>or</p><p></p><p>500v DC / 3.65Mohm = 0.000137 amps</p><p></p><p>BUT more often than not the actual IR value will be different at the different test voltages.</p><p></p><p>so @ 230v Ac you may NOT actually get a 3.65megohm ????</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 86845, member: 250"] Not withstanding the point that the IR test is actually being done with an instrument that generates either... 250v DC 500v DC or 1000v DC in accordance with the appropriate nominal circuit voltages, as per table 61 on page 158 of Big red! you is either going to be looking at 250v DC / 3.65Mohm = 0.0000684 amps or 500v DC / 3.65Mohm = 0.000137 amps BUT more often than not the actual IR value will be different at the different test voltages. so @ 230v Ac you may NOT actually get a 3.65megohm ???? [/QUOTE]
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Low IR reading on ring main
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