I ignore the 0.1 Ohms and try for less than 20 milliOhm it is safer.
You correctly remind us about 'ground' and 'earth' and protective conductor'.
I'm glad I'm not the only one annoyed about not having 0 V returns on CAE equipment - their design rule checkers shoul be making sure that this is not wrong - not prompting us to get it wrong!
It takes very little technology to provide a print out of actual readings (in black for a pass value and red for a fail value) as this provides actual eveidence of the readings and as I mention before allows the calculation of mode, median & mean etc. I do not agree that it costs much money - an accountant may say it costs money but in Quality Terms this preventative cost is small compared to the failure costs of getting it wrong especially when it comes to safety. Running these tests over night whilst equipment is 'burnt in' makes for a very quick - look for anything printed red in the morning saves time.
The whole area of PAT, test times, recording results smacks of window dressing and little real engineering quality and thought about the real safe technical needs, the time test are applied, the time between tests etc.
Thanks again for making a useful contribution to the discusion.
