Earth Fault Loop Impedance Test - 3 Lead Low or 2 Lead High

Earth Fault Loop Impedance Test - 3 Lead Low or 2 Lead High - Test Explained

День тому

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 impedance...
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Earth fault loop impedance test
00:05 - Eric is doing work experience
00:35 - Set to 3 lead low
01:05 - 2 lead high test for earth fault loop impedance
01:34 - 3 lead low test for earth fault loop impedance
02:08 - 2 lead low test for earth fault loop impedance
03:09 - Recap learning with Eric
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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КОМЕНТАРІ: 26

@testingtechnicians6751 Рік тому

I was searching for similar videos for months, thanks for doing this

@GSHElectrical Рік тому

👍🏻

@heisenburg8608 Рік тому

Keep it up Eric! Electrical work is very satisfying. You're constantly learning and challenging your knowledge. Always push yourself to solve problems!

@GSHElectrical Рік тому

Thanks for the support 👍🏻

@avfczoff 10 місяців тому

Great video Marcus, very helpful & clear to understand. Thank you 👍🏻

@GSHElectrical 10 місяців тому

Massive thanks 👍🏻

@matthewdale956 Рік тому

good luck Eric......listen and learn fella

@GSHElectrical Рік тому

👍🏻

@sugardaddyxxx Рік тому

You can do at a pendant or a light switch, it’s in the onsite guide.

@seandempsey7351 Рік тому

Two lead low for loop test on a light switch, interesting I have never heard of that , I do the loop impedance test on lighting circuits at the board or a ceiling rose . Fantastic video as always 👍👍❤️

@michaelcostello6991 Рік тому

Why is it called 3 lead low ? What is low ? Are you still using the full voltage as you send the same level current down the neutral ? Please clarify. Great video. Thank you and another thumbs up as always.

@jonathanireland2913 Рік тому

"3 Wire Low" test uses 15mA of test current and balances across N - CPC to not trip an RCD. "2 Wire High" injects 20A of test current into the test circuit for a fast and accurate result, and will trip residual devices and small MCB's or sensitive MCCB

@heron9524 6 місяців тому

@@jonathanireland2913does 2 lead high inject 20 amps of fault current. That sounds very high. I thought it was 150ma of fault current?

@jonathanireland2913 6 місяців тому

@@heron9524 I read it somewhere many moons ago, however it may well have changed with more modern test equipment. It was sufficient current flowing to nuisance trip a B curve 6A mcb, according to the manual.

@lifter98 10 місяців тому

I love electrical testing and particularly fault finding. It's the only thing interesting about electrical work...

@Dibbo1979 Рік тому

Think you’ve got a cut on your finger. Blood stain on socket😂👍🏻. Great video 👌🏻👍🏻

@GSHElectrical Рік тому

Thanks for watching and commenting 👍🏻

@420pilz Рік тому

I have Megger but on fluke no 2 wire test

@simonbooth7802 Рік тому

Why does my meggar trip on 3 low or 2 low on Eli testing?

@2194jamie Місяць тому

Should work , from my experience Crabtree rcd/rcbo don’t like the lo or hi setting

@henrystevens2258 Місяць тому

You don't on 2 low and 3 low the results readings have a difference of a fifth of a ohm

@TermoneenyCC 10 місяців тому

Good man Eric, just kick him in the balls if he gets out of line. bosses are all the same,

@GSHElectrical Місяць тому

🤣🤣

@Dog-whisperer7494 Рік тому

I don’t see how you can test the loop impedance at a light switch as there’s no neutral, so you would be testing the strapers ie line and switch return. Hang on hang on . To do this test at the switch isn’t a loop impedance tester it an R1+R2 ie a continuity test witch is then added to the Ze value, therefore it is a calculated value , the same would be for testing at the ceiling rose. So to get a measured Zs at the ceiling rose would be a three lead test.

@westinthewest Рік тому

Zs testing doesn't need a neutral. A light switch gives you access to line and CPC which form a continuous loop from the local transformer. The test will give you a true impedance reading as long as the circuit is live.

@alanrobinson847 7 місяців тому

I liketo do drawings to explain to people, especially younger people as things seem to be fast tracked and nobody explains it to them they're only told what to put the meter on, I knew the hi low setti gs but never knew how they did worked, good explanation