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Why is the earthing pin in 3 pin electrical plugs bigger than the other two?

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Tuition/Class IX-X Tuition

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The basic function of earth pin is to flow large amount of current from equipment body to earth in case of fault within very short time for which its resistance must be very low and we know for the same material resistance is inversely proportional to area therefore earth pin is larger than other pin...
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Expert Tutor for Science (VI to Xth)

The earthing pin is bigger and longer also because, 1. Every electrical elements have some storing elements (i.e-capacitor). It might happen that when you remove the socket from electrical board, there may be some electrical energy stored in the device. next time when you again insert the socket this... read more
The earthing pin is bigger and longer also because, 1. Every electrical elements have some storing elements (i.e-capacitor). It might happen that when you remove the socket from electrical board, there may be some electrical energy stored in the device. next time when you again insert the socket this may cause a short circuit. SO the earth pin is made longer than other because it will come in contact before the other two pins and if there is any residual electrical energy left in the appliance it will tranfer it to the ground. 2. If the live wire comes in contact with the conducting body of the appliances it can damage other parts or can give a shock. It is bigger than the other two to dissipate the charge to ground faster . I think this will clear your doubt. read less
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Earthing pin resistance would be lower than remaining two as resistance is inversely proportional to diameter of the conductor . So it is made bigger than other two. Better the earthing equipment gets (lower resistance) more the equipment is same for the user.
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The earth pin on a plug is longer than the live and neutral pins. This means the earth pin is the first to connect and the last to disconnect. When inserting the plug, the earth connection is made before the current carrying contacts of the plug become live. When withdrawing the plug, the current carrying... read more
The earth pin on a plug is longer than the live and neutral pins. This means the earth pin is the first to connect and the last to disconnect. When inserting the plug, the earth connection is made before the current carrying contacts of the plug become live. When withdrawing the plug, the current carrying contacts shall separate before the earth connection is broken. read less
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Personal Home Tutor

There are more than a solo reasons I m enlisting almost all one by one. There are to category of the reasons one is common sense and the other one is logical. First common sense. 1 To differentiate between the live terminals and the the earth terminals . 2. It is bigger than other because by mistake... read more
There are more than a solo reasons I m enlisting almost all one by one. There are to category of the reasons one is common sense and the other one is logical. First common sense. 1 To differentiate between the live terminals and the the earth terminals . 2. It is bigger than other because by mistake we try to plugin it into the other sockets like live . Now the logical approach 1. The diameter of cross section is bigger lesser the resistance this principle works when by mistake currents are leaking to it and without hindrance the current can flow in earth terminal. 2. One reason is that it is bigger and wider so that before other terminals can make a circuit with their respective heads sockets the earth terminal make its circuit with earth so that in case of failure of live terminal it can prevent form sock and the short circuits Have a nice day. Thankyou read less
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Tutor

so that equipment is connected to earthing for safety of equipment and person who is plugging the electrical plug before it is connected to supply voltage through other two smaller pins. earthing pin is also thicker than other two pins, this is to safely handle extra current in case of problem in the... read more
so that equipment is connected to earthing for safety of equipment and person who is plugging the electrical plug before it is connected to supply voltage through other two smaller pins. earthing pin is also thicker than other two pins, this is to safely handle extra current in case of problem in the equipment. read less
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Teacher for Maths and Electronics Engineering

The basic function of earth pin is to flow large ammount of current from equipment body to earth in case of fault within very short time for which its resistance must be very low and we know for the same material resistance is inversly propotional to area therefore erth pin is larger than other pin.
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Mathematics Tutor having vast teaching Experience, Gold Medalist, International Teaching Experience. My previous experience includes Head of Mathematics Department, Delhi Public School, Academic In charge, International Indian School.

The earth pin on a plug is longer than the live and neutral pins. This means the earth pin is the first to connect and the last to disconnect. Hence, to prevent electric shock, This ensures that the appliance is properly earthed (grounded). This way if you touch a faulty appliance, you don't get elec...
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simple for identification of earthing pin
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Engineer

The ground pin is longer so when you insert the plug, the earth connection is made to the equipment first. When you remove the plug, the earth connection is removed last. This is for the user safety. It is bigger so you can not insert the plug in any other way. The smaller pins on the plug can go... read more
The ground pin is longer so when you insert the plug, the earth connection is made to the equipment first. When you remove the plug, the earth connection is removed last. This is for the user safety. It is bigger so you can not insert the plug in any other way. The smaller pins on the plug can go into the larger hole, but the larger pin will never go into a smaller hole. So any live wire cannot be connected to the body of the equipment. read less
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