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Some advice please .
when doing IR test , generally i test the lighting circuit with the load shorted (L-N) and test across earth and live or neutral as removing all lamps and disconnecting fluorscents is time consuming .
now and again i will test the whole CU in this way .
Firstly , why is it that on some occasions a perfect reading (on a megger <999) is obtained , while sometimes anything between 10-800 Mohms is found .
secondly , when recording these results on the report is it correct to include the L-N column or not ?
lastly , how is it possible that when doing IR test normally (load not shorted ) a lower reading is sometimes found on N-E even though this is dead test and main switch is isolated
cheers
when doing IR test , generally i test the lighting circuit with the load shorted (L-N) and test across earth and live or neutral as removing all lamps and disconnecting fluorscents is time consuming .
now and again i will test the whole CU in this way .
Firstly , why is it that on some occasions a perfect reading (on a megger <999) is obtained , while sometimes anything between 10-800 Mohms is found .
secondly , when recording these results on the report is it correct to include the L-N column or not ?
lastly , how is it possible that when doing IR test normally (load not shorted ) a lower reading is sometimes found on N-E even though this is dead test and main switch is isolated
cheers