First Thing First.
Earthing is the first thing to install in electrical field. Earthing is
essential for human safety, but not really understood by the protected.
Often I hear "That is only an earth". Well, without earthing, you motor
will run. But without earthing your are potentially in danger. So, I alway
say "Earth comes first".
I made a lot of sketches relating safety earth. In the sketches, I used a
word "grounding". American people use "grounding" instead of
"earthing", I have been working with NEC long time. So, let me use
grounding and earthing interchangeably. I would like to add more on
safety earth based on IEE or IEC when I have time to do so.
See the sketch first. Each figure need some explanation or story. I will
add some narratives later.