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insulation resistance


4285sct

Question

hi all iv just run a new ring for a kitchen which has 7 points and a fused switched spur end to end is r1 0.39 rn 0.39 r2 0.63 r1 r2 0.25 but my insulation resistance is 478 i know its over 200 but should i re do it or is it ok and why so high ???

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hi yes it was ,i know its well in but i also installed a 32a hob radial a 16a micro oven radial a 16a hot tap radial and a 6a lighting radial when testing it all was greater than 1000 all but the ring which was 478 m ohmes so i removed all the sockets to eliminate them, its just i dont want to leave a poss fault as im only just qualified as a sparks thanks scott.

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hi yes it was ,i know its well in but i also installed a 32a hob radial a 16a micro oven radial a 16a hot tap radial and a 6a lighting radial when testing it all was greater than 1000 all but the ring which was 478 m ohmes so i removed all the sockets to eliminate them, its just i dont want to leave a poss fault as im only just qualified as a sparks thanks scott.

what tester do you have? fluke would say >499 and megger says >299, i think you may have read it wrong or had it on the wrong setting

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at 478megs there wont be any faults to leave.

I'm not sure if its something to do with some of the older generation sparks (no offence, you golden oldies), but when I was an apprentice the older ones allways used to be 'iffy' about things like this. Taking perfectly passable results and trying to find faults because the weren't the 100% value.

As long as it passes, it passes. Obviously if its very close then problems may start occurring in the future.

I wouldn't worry mate

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never used one of those, but as said before 478 is well with in the limits

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Andy™

my test kit only goes to 299M ohm, so wouldnt even show as a low reading to me

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478M ohms? you want it high.

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478 is miles in the clear. Its fine to leave it at that. It may have been a slight bit of moisture when the cable was in storage, etc. But 478 is a definate pass matey.

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