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.

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Electrical UK Wiring

NOTE - 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 👍🏻.

🔵 Testing for External Earth Fault Loop Impedance (Ze) When You Have a Main Earthing Terminal (MET)    • Testing for External Earth Fault Loop...  

🔵 First Live Test AM2 & AM2S - Check Polarity of 3 Phase Supply, Using an Approved Voltage Indicator    • First Live Test - Check Polarity of 3...  

== 🕐 Time Stamps - Cut to the action 🕕 ==

00:00 - External earth fault loop impedance
00:14 - Removing the loads
00:49 - Mains switch
01:00 - Why disconnect the earthing conductor
01:30 - Earthing system
01:54 - Test instrument
02:20 - First test
02:59 - Second test
03:24 - Third test
03:44 - Results

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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