WHY EARTH GROUND IS IMPORTANT
If fault currents have no path to the ground through a properly designed and maintained grounding system, they will find unintended paths that could include people.
Why earthing/ grounding is necessary:
Poor earthing/ grounding not only contributes to unnecessary downtime, but a lack of good grounding is also dangerous and increases the risk of equipment failure. Without an effective grounding system, we could be exposed to the risk of electric shock, not to mention instrumentation errors, harmonic distortion issues, power factor problems and a host of possible intermittent dilemmas.
What is electrical earth or ground:
The NEC, National Electrical Code, Article 100 defines a ground as: “a conducting connection, whether intentional or accidental between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth.”