In three pin plug 6 Amp. 220v AC rating. why earth pin diameter is higher than other two pin? what its purpose ?
1 Answer
In a three-pin plug with a 6 Amp, 220V AC rating, the earth pin (also called the grounding pin) has a larger diameter than the live and neutral pins. This design has a specific purpose:
In short, the earth pin is made bigger for both safety and proper functioning, ensuring that the device is grounded effectively before any other electrical connections are made.
- Safety Priority: The earth pin is the most important for safety. It ensures that if any fault occurs, like a short circuit or a leakage of current, the electrical device gets safely grounded, preventing electrical shock hazards.
- First to Connect, Last to Disconnect: The earth pin is designed to make contact first when the plug is inserted into the socket and to be the last to disconnect when the plug is removed. This ensures that the device is properly grounded before the live and neutral connections are made, and the device is grounded last when the plug is pulled out. This minimizes the risk of electric shock when plugging in or unplugging the device.
- Clear Identification: The larger diameter makes it easier to identify the earth pin and makes sure it aligns with the corresponding earth hole in the socket, ensuring proper and safe connection.
In short, the earth pin is made bigger for both safety and proper functioning, ensuring that the device is grounded effectively before any other electrical connections are made.