As far as the r1 +r2 tests r concerned I jst take the furthest outlet point n take reading correct.Bt wt apens on 3 phase wiring do I just joint out one of the phases ona conecta to its earth and te3st at its furthest outlet?ths corect?Say the motor circuit was mains t motor isolator frm here t motor were wd it need testing at the isolator or actual motor for r1 +r2?help guys