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id use my fluke dmm on continuity. it goes a lot lower than the continuity on a megger.
no need for a megger when fault finding
no need for a megger when fault finding
Discuss RCBO not restting in the UK Electrical Forum area at ElectriciansForums.net
As a rule I always do the 250 test first but I often use 500 when fault finding. The thing is though, some may not have the sense to do a soft test first250V range. There would be very few occasions when I would be using 500v on fault finding!
250V range. There would be very few occasions when I would be using 500v on fault finding!
Always use 500V for circuits operating at 240V AC, there's no point testing insulation resistance at a voltage less than the peak voltage of the supply.
You have answered your own question there, the fault is present at 230v and is operating the RCBO, therefore higher than that is not required to trace the fault. I appreciate what 500VDC testing provides, but in the case of locating a fault that is tripping a 30ma RCD, 250VDC is adequate and with no risk.Very good point brought by Davesparks.... if we have 230v RMS then peak voltage is around 320v so exactly what would an insulation test that isn't in excess of this proof because it may not show any issues or failed readings where a 500v would unless its very poor value.
Good luck when you get an insulation fault!id use my fluke dmm on continuity. it goes a lot lower than the continuity on a megger.
no need for a megger when fault finding
Sigh....Right! i have finally got it...the 0.42 is the duration our poor OP lasted,from original post,1.00 being a full day of 24 hours,corrected for temperature...:icon12:
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