Magical 1.67 - Ring Circuit Testing If you wire a ring final circuit in 2.5mm2 twin and CPC cable (twin and earth) the relationship between the resistance of the live conductors and the CPC is a multiple of 1.67. 🔵 How to Test a Ring Final Circuit - Ring Main or Socket Circuit - Ring Continuity & Polarity Tests https://youtu.be/UesYHVsZD-E Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E. #GSHElectrical #Electricaltrainingvideos #elect