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In a ‘three pin plug’, why is the earth pin made longer and thicker than the other pins?

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Question

In a ‘three pin plug’, why is the earth pin made longer and thicker than the other pins?

Very Short Answer
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Solution

The earth pin is longer so that the earth connection is made first and broken last. It is thicker to provide a firm, low-resistance earth connection and to prevent insertion into the live or neutral socket openings.

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Chapter 4: Electricity and Magnetism - Frequently Asked Questions in Board Examination [Page 282]

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Frank Physics Part 2 [English] Class 10 ICSE
Chapter 4 Electricity and Magnetism
Frequently Asked Questions in Board Examination | Q 5. (a) | Page 282
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