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Question
Give the role of each of the three terminals of a three way pin plug.
Solution
The earth pin being thicker can never enter live or neutral sockets thus a given electric appliance gets connected only in one proper electrical position, where the live wire, neutral and earthing are connected correctly.
The earth pins being longer, get connected to earth terminal first, thus ensuring that the user will not get an electric shock, because the current will melt the fuse in case the electrical appliance is short-circuited.
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