EICR Ring Circuit Fault Finding Issues - Testing an Open Ring Circuit & Low Insulation Resistance On site with electrician Matt testing and fault finding whilst doing an EICR (electrical installation condition report). This video will be used to support classroom teaching at college. Matt highlights issues with the ring final circuit (ring main) open ring test end to end and low insulation resistance test. NOTE - Some further discussion have been left for the classroom lessons. This video gives