2-pin plug

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What is the difference between a 2-pin plug and a 3-pin plug?

2-pin plug A 2-pin plug means that the device is not grounded and usually has two pins to carry power.Previously, all electrical equipment was equipped with 2-pin plugs, and all power outlets used 2-pin plugs, which meant that the all equipment was not grounded. However, as the current and voltage of electrical appliances become larger, [...]