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 preparing for your end skills test AM2, AM2S or AM2E requires time testing at college and on-site experience of testing electrical circuits.
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Earth fault loop impedance testing
00:05 -16 amp single phase industrial socket outlet
00:30 - 3 lead low test
00:48 - Maximum Zs 2.2 ohms
00:53 -16 amp 3 phase industrial socket outlet
01:48 - Testing line 1 (L1) earth fault loop impedance
02:15 - Testing line 2 (L2) earth fault loop impedance
02:47 - Testing line 3 (L3) earth fault loop impedance
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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[@GSHElectrical]

Would love your comments on the testing process and the leads Matt has made up… Please be polite in the comments 👍🏻 Gaz

[@ljhelectrical1291]

The temp elec sector has test plugs that are safer to use than these. I've even built some myself using banana plugs and small adaptable boxes.

[@Dog-whisperer7494]

That’s a good idea making up a set of test leads like that 👍
I just had a 13amp socket and a 16amp industrial plug joined together with 2.5 mm2 three core flex. Well done Matt maybe you should see about getting those lead’ To a manufacture? Fantastic video Gaz as always 👍👍👍❤️

[@markandrews8437]

Good timing this video I've got some testing to do on single and three phase commando sockets I could do with making some test leads like yours for my fluke 👍

[@GSHElectrical]

Happy to help 👍

[@GSHElectrical]

Happy to help 👍

[@emilgemc8913]

You can stick a brown tape for L1 black tape for L2 Grey Tape for L3 and Blue for black lead

[@electricalservicesmaroc]

Thanks a lot

[@GSHElectrical]

Thanks for commenting 👍

[@mb-electricalservices]

Surprised at the difference in Zs measured between the phases at the commando socket. Could that have been maybe poor contact on L1 and L2 which would explain the 0.19 Ohm difference between L1 and L3?

[@seandempsey7351]

He’s a clever boy that Matt

[@AshleyWilliams12345]

I’m a little concerned, live test without fused leads? I can understand the desire to make this easy, imo I would prefer one of the pre manufactured adapters. Personally I would do the test at the isolator and just confirm continuity of the CPC to the socket.

[@JasperJanssen]

What fuses would be in there if you were as per tradition putting test probes onto the screw terminals and why is that different?

[@JackR772]

What do you do if you have got an rcd that trips when you do the test, how do you get around that?

[@kdobaggins3410]

Low test..High test will knock out RCDs on the line..
On a fluke tester it's Z1 (no trip)
Z1 (high current if no RCD is on the line or elsewhere on the supply..

[@JackR772]

@@kdobaggins3410 Thanks

[@dkaloupis75]

Let me make a guess, the Green goes to neutral, the red to CPC, and black to live….just because it comes handy not to explain the sequence

[@digitaria]

I thought you doubled the result?

[@paulsharman4491]

I thought that was pscc.

[@digitaria]

@@paulsharman4491 your right it is pfc

[@ryanhudson3660]

Yes should have gotten both pfc and psc then whatever is higher x2

[@ryanhudson3660]

Most likely psc is highest