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Live testing for external earth fault loop impedance often called the Ze test. This test is demonstrated on a live 3 phase distribution board and will help with AM2, AM2S and AM2E exams. In this video I show you the importance of removing parallel earth paths and how this can be achieved when an installation has a remote MET (main earth terminal).
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- for AM2, AM2S and AM2E you may have a remote main earth terminal (MET) if this is the case this could have the bonding connecting in it (best to check). This will mean the earthing conductor could be removed and tested from this point for the external earth fault loop impedance or you can remove the bonding from the MET and test as shown in this video.
NOTE 2- Your end point assessment AM2 and AM2S will require you to have the main switch locked off, sign in place and key In your pocket during this test 👍🏻.
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - External earth fault loop impedance
00:08 - 3 phase supply and cut out
00:20 - The main earth terminal MET
00:53 - Removing parallel earth paths
01:38 - Overview of a 3 phase supply to a distribution board
03:00 - Disconnecting the Earthing conductor for the MET
03:37 - Testing between L1 and the Earthing conductor
03:47 - Testing between L2 and the Earthing conductor
04:05 - Testing between L3 and the Earthing conductor
04:51 - On site with Matt
05:34 - Turning of MCB's before supply isolation
07:15 - Disconnected Earth conductor
08:06 - Carrying out the external earth fault loop impedance test
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
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