How to measure earthing using multimeter

We can check easily our home earthing with commonly used multimeter device.

Below figure is a commonly used power socket. Right side port is Phase, Left side port is Neutral and Top port is Earth.

Steps -

1. Set Multimeter 750v and plug in red (Phase) and black (Neutral) wire in multimeter as shown in figure below

Check Phase & Neutral

2. Plugin Red (Right Port) and Black (Left Port) wire in power socket then switch on the power as shown below

Now, note down the value of multimeter as shown below. In my experiment, I got 223 V

Check Phase & Earth

3. Plugin Red (Right Port) and Black (Top Port) wire in power socket then switch on the power as shown below

Now, note down the value of multimeter as shown below. In my experiment, I got 222 V

Check Neutral & Earth

4.  Plugin Red (Top Port) and Black (Left Port) wire in power socket then switch on the power as shown below

Now, note down the value of multimeter as shown below. In my experiment, I got 5 V

Now, calculate the earthing 

Voltage difference step 2 and step 3 as 223V -222V=1V

Voltage difference step 2-3 and step 4 as 5V - 1V = 4V

So, my earthing value is 4 V.

Note: If you want to measure the actual earthing resistance, you would need an Earth Resistance Tester.

Though it is not a IT related article but this will help you to keep your devices safe from faulty power connection.

Thank you!