Earth Fault Loop Impedance Test - 3 Lead Low or 2 Lead High - Test Explained In this video Marcus explains what happens when we would set our MFT tester to 3 lead low, 2 lead high and even 2 lead low in order to carryout an earth fault loop impedance on a circuit that has RCD protection. So we can carryout a earth fault loop impedance test it is important to select the correct setting on an MFT tester but do you understand why we often select 3 lead low setting when testing for earth fault loop

Earth Fault Loop Impedance (Zs) - Testing 16 Amp Industrial Socket Outlets Both Single and 3 Phase Electrician Matt is carrying out an earth fault loop impedance testing (sometimes called the Zs test) on a 16 amp single phase and a 16 amp 3 phase industrial socket outlet (sometimes call a commando socket). This video Matt shows how to carry out the tests as well as the plugs and leads Matt has made up to make this test easier but your thoughts on if it’s safer are VERY welcome... As always prepa