why earthing point is greater than another two points of
Please clarify.
It's greater because you want the ground connection to be made first.
This reduces the possibility of an electric shock.
To understand why the earthing point is greater than the other two points, we need to understand what earthing is and its purpose.
Earthing, also known as grounding, is a process of connecting electrical systems and equipment to the Earth's conductive surface. The primary purpose of earthing is to provide a safe path for electrical energy in the event of a fault or surge, preventing electric shock hazards and protecting the equipment.
In a typical electrical system, there are three key points: the live wire (also known as the phase), the neutral wire, and the earthing point.
1. Live wire: The live wire carries the electrical current from the source (e.g., power station) to the electrical devices/appliances. It is usually designated with a red or brown wire and is at a higher voltage (e.g., 230V in most countries).
2. Neutral wire: The neutral wire completes the electrical circuit and carries the return current back to the source. It is usually designated with a blue wire and is at a similar voltage as the earth (e.g., 0V in relation to the earth).
3. Earthing point: The earthing point is a connection to the Earth's conductive surface, often through metal rods or plates buried underground. It provides a low-resistance path for electrical faults or unwanted energy, such as lightning strikes. In an ideal earthing system, the earthing point should have zero voltage potential compared to the Earth.
Now, coming back to your question, the earthing point is not necessarily greater in terms of voltage compared to the live or neutral wire. In fact, the goal is to have zero voltage potential at the earthing point relative to the Earth. Any voltage appearing in the earthing point would be considered a fault or an undesired condition, indicating a problem in the electrical system.
However, in terms of function and importance, the earthing point is arguably more critical than the live or neutral wire. It serves as a safety measure, effectively discharging electrical faults or energy surges to the ground, protecting people from electric shocks and preventing damage to electrical equipment.
To summarize, the earthing point is vital in electrical systems to ensure safety and protect against electrical faults. While it is not necessarily meant to have a higher voltage than the other points, it plays a crucial role in providing a safe path for unwanted electrical energy.