Live testing for external earth fault loop impedance, prospective earth fault current PEFC and prospective short circuit current PSCC (PFC tests). These tests are demonstrated on a live 3 phase distribution board and will help with AM2 and AM2S exams. We use the rule of thumb for calculating the PSCC test by taking the highest reading form the line and neutral tests and doubling it and then we go on to show you how some instruments can measure PSCC between line conductors. As always preparing for your end skills test AM2, AM2S or AM2E requires time testing at college and onsite experience of testing electrical circuits.

NOTE for AM2 etc you may have a remote main earth terminal (MET) if the 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 .

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 Ze and PFC tests
00:54 Isolating the 3 phase distribution board
01:58 Disconnecting the earthing conductor to remove parallel earth paths created by the bonding
02:55 External earth fault loop impedance test Ze test on a 3 phase disboard
05:11 Reconnect the earthing conductor
05:19 Prospective earth fault current PEFC test (PFC)
06:34 Prospective short circuit current PSCC test (PFC)
08:00 Rule of thumb double your highest reading from PSCC test for a 3 phase supply
09:48 Testing PSCC between the 3 line conductors of a 3 phase supply

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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