I cannot answer that, but I can pour water on troubled oil by adding another observation.
The 1 meg limit is for a DC test and as such ignores any capacitance that in many cases is the larger cause of earth leakage currents anyway.
Normal twin and earth manages 50-100pF or so per metre from L and N to E, so an installation of perhaps a few tens of metres, will have a significant leakage at 50Hz, and nothing at DC - as we sometimes see with 'ghost voltages' on disconnected cores running beside live ones that are enough to cause LEDS to glow dimply or CFLs to flicker.
It is all very well keeping the DC test result to a level that means you might expect leakage from 230V of below 250uA, but when 50Hz is applied it may well rise to a few mA, being a megohm in parallel with so many nanofarads of incidental capacitance.
I cannot answer that, but I can pour water on troubled oil by adding another observation.
The 1 meg limit is for a DC test and as such ignores any capacitance that in many cases is the larger cause of earth leakage currents anyway.
Normal twin and earth manages 50-100pF or so per metre from L and N to E, so an installation of perhaps a few tens of metres, will have a significant leakage at 50Hz, and nothing at DC - as we sometimes see with 'ghost voltages' on disconnected cores running beside live ones that are enough to cause LEDS to glow dimply or CFLs to flicker.
It is all very well keeping the DC test result to a level that means you might expect leakage from 230V of below 250uA, but when 50Hz is applied it may well rise to a few mA, being a megohm in parallel with so many nanofarads of incidental capacitance.
