You must have seen that some plug or charger has 2 pins and some have 3 pins. Have you ever wondered why this is so? Have you ever wondered why 2 or 3 pins are not given in all chargers? In fact, in India, the number of pins on a plug or charger depends on the type of electrical outlet used in the country and the safety standards of the Bureau of Indian Standards (BIS). In this article, we will know why two pins are given in some plugs and three pins in some in India.
two-pin plug
Two-pin plugs are commonly used in India for small electronic devices such as mobile phones and cameras. This type of plug has two pins that are designed to fit into a two-slot electrical outlet. The two pins are usually round and have a diameter of 4.0 mm. These are also called Euro plugs.
History of the Two-Pin Plug
The history associated with the two-pin plug in India is quite interesting. India previously had a British-style electrical system with three-pin plugs and sockets. After India’s independence, India switched to a two-pin system to deliver electricity to remote areas and villages. Switched to the two-pin system especially in places where the electricity infrastructure was not well developed. The two-pin system facilitated an easy-to-install electrical infrastructure.
three-pin plug
Three-pin plugs are also commonly used in India. They are especially used for heavy electrical appliances like refrigerators, air conditioners and washing machines. These plugs have three pins. It is designed to fit into the grounding slot in an electrical outlet. The three-pin plug is mainly used in the security region. Actually, in a three-pin plug, the top long and round pin is called the earth pin. The earth pin provides an additional level of protection by connecting the device to earth. This allows, in case of a fault such as a short circuit or power surge, excess electricity to be earthed instead of passing through the device, thereby reducing the risk of electric shock or fire.
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BIS has made strict security for electrical devices and plugs in India. As per BIS, all heavy electrical equipment should have a three-pin plug and that the earth pin should be properly connected to the earth. The use of a three-pin plug is mandatory for all devices consuming more than 5 amperes.
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