| 1. | :In mainland Europe the earth pin is in the plug surrounding itself.
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| 2. | The Chinese socket is normally mounted with the earth pin at the top.
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| 3. | Originally there was no convention as to the direction of the Earth pin.
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| 4. | The earth pin is connected to the safety ground line.
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| 5. | The variants use a flattened earth pin, each at a different specified rotational position.
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| 6. | It ensures that the protective-earth pin establishes contact before the line and neutral pins.
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| 7. | However, the socket may not necessarily be installed with the earth pin at the top.
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| 8. | The earth pin is too large to be inserted into the or neutral sockets by mistake.
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| 9. | The type 12 plug adds a central 4 mm diameter round earth pin, offset by 5 mm.
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| 10. | The earth pin is offset 3.0 mm.
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