Zdb - WHAT IS IT? - WHY DO WE HAVE Ze? - WHY USE Zs? - TESTING Zdb & RECORDING ON TEST CERTIFICATES

In this LearnElectrics video we will look at the measurement of Zdb - this mystery symbol that pops up on the Schedule of Test Results.
A recent question asked us …
Why do some certificates ask for Ze and some ask for Zdb?
There must be a reason for this, but I can’t find out.
Is there a logical explanation and if so, what is it?
So let’s look at this in steps and show you where we use Ze, where we measure Zs and just where Zdb comes into all this.
They are all an Earth Fault Loop Impedance measurement, they all use the same settings on the test meter, but what we do with the results and what they mean, makes a big difference.
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This is video No.190 on our RUclips channel where we have videos on a wide range of electrical topics.