Earth Fault Loop Impedance Path Earth fault Loop Impedance path for an installation connected to a TN-S earthing arrangement. The earth fault loop impedance path need to be of low impedance so the fault current is high. This high fault current will cause the overcurrent protective device (fuse) to operate very quickly. The path consists of the exposed conductive part, the CPC, the earth bar, the earthing conductor and the line conductor. Videos are training aids for City and Guilds (C and G) and

3 Phase External Earth Fault Loop Impedance Test Live testing for external earth fault loop impedance on a 3 phase supply. This test is demonstrated on a live 3 phase distribution board and will help with AM2 and AM2S exams. As always preparing for your end skills test AM2, AM2S or AM2E requires time testing at college and on-site experience of testing electrical circuits. NOTE - Your end point assessment AM2 and AM2S will require you to have the main switch locked off, sign in place and key In