Great content as usual. Keeping things simple, thinking about a teaching career when you're too old to be on the tools? Honestly if you lost any one then they need to go back to class. Best info for me was the quick summary on the fact different testers call it different things but the basics of hi and low (trip and no trip) and that most require 3 wire test on low.
Sorry, but stating that impedance and resistance are the same isn't the best approach in my opinion. Impedance is resistance to AC current and the resistance value is purely the DC component. From your distribution board out along the final circuit which is just a cable, then yes, the impedance and resistance will be the same as the cable has no reactive component to it. That is why it is just measured with a resistance meter. However, as you go back into the DNO supply from the distribution board and come to the transformer secondary winding, that does have both a resistive and a reactive element and the two added together will give the impedance. It therefore, must be measured with an AC Test Current. If you measured the the DC resistance of the earth loop, you would get a lower value than if you measured the impedance value. The impedance value is more reflective of the actual fault current, where as the DC loop measurement would give a higher fault current, that the system would not be able to supply in reality.
If it wasn't "basically" the same how could you add R1 and r2 to Ze. Yes Z is a measurement of resistance at a given frequency, but a straight run of copper should have negligible difference between Z and R, now a motor winding or an indicator coil or anything that produces a reasonable magnetic field then Z is greatly affected in relation to R.
Great video as always Mike 👍🏼
Yes 👍
Thanks for run through - nice video, well explained!
Excellent run through of what it is. Thanks
Thanks Mike
Brilliant explanation
You are great ❤❤❤❤❤❤ thank you. God bless you
Can I test Zs on a lighting circuit with led fitting which lit up? Cheers
Thank you. That was very well presented. Well done you. Infact first class.
Thanks, glad you enjoyed it!
I think with your tester doesn't have to be a 3 lead test for low. Easier to use 2 lead low. Just change setting with F1 button.
The most important test 🙌❤
Yes
Is this for TT system?
Great content as usual.
Keeping things simple, thinking about a teaching career when you're too old to be on the tools?
Honestly if you lost any one then they need to go back to class. Best info for me was the quick summary on the fact different testers call it different things but the basics of hi and low (trip and no trip) and that most require 3 wire test on low.
Brilliant 👏 thanks 👌🏻
Very good videos
What’s the motor whirring in the background?
Sorry for going off the point, little Schneider VFD’s in that panel or softstarts?
@@residualelectrical noo, don’t apologise.
Loop testing description whilst in a panel is my jam mate. 😆😆😆👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻
I really appreciate
Pro ❤❤🎉🎉
👍👍👍👍👍
Yes 👍👍
No volume
@@residualelectrical appoligies it was connected to my car . Dah
Why would be listen to you when you’ve only ever installed 1 earth rod?
You been on the beer
Sorry, but stating that impedance and resistance are the same isn't the best approach in my opinion.
Impedance is resistance to AC current and the resistance value is purely the DC component. From your distribution board out along the final circuit which is just a cable, then yes, the impedance and resistance will be the same as the cable has no reactive component to it. That is why it is just measured with a resistance meter.
However, as you go back into the DNO supply from the distribution board and come to the transformer secondary winding, that does have both a resistive and a reactive element and the two added together will give the impedance. It therefore, must be measured with an AC Test Current.
If you measured the the DC resistance of the earth loop, you would get a lower value than if you measured the impedance value. The impedance value is more reflective of the actual fault current, where as the DC loop measurement would give a higher fault current, that the system would not be able to supply in reality.
If it wasn't "basically" the same how could you add R1 and r2 to Ze.
Yes Z is a measurement of resistance at a given frequency, but a straight run of copper should have negligible difference between Z and R, now a motor winding or an indicator coil or anything that produces a reasonable magnetic field then Z is greatly affected in relation to R.
1st view!