How can safety be ensured using a three – pin plug ?

Hint: To answer this question, we first need to understand what is earthing. For safety and functionality, an earthing system or grounding system connects particular portions of an electric power system to the ground, often the Earth's conductive surface. The type of earthing system used might have an impact on the installation's safety and electromagnetic compatibility.

Complete answer:
Three pin-plug: A three-pin plug has three pins (thus the name). The 3-pin plugs are designed to safely supply energy to electrical gadgets. As indicated above, each wire has its own color, and each pin must be linked correctly to the three wires in the electrical line.

If the wires within any device come into contact with the appliance surface, the surface conducts the current and threatens to travel through us to the ground, the grounding will route the current directly to the ground and safeguard us. In comparison to a 2-pin connector, 3-pin connectors safeguard our safety from current. In comparison to a 2-pin connector, 3-pin plugs limit the amount of power that may pass through the circuit. As a result, 3-pin plugs are safer than 2-pin plugs.

Reason for how three pin plugs will ensure the safety: A three-pin plug's pin $E$ makes contact with the earth line. This pin is now connected to the appliance's body. Electricity flows to the ground through the earth wire if the body comes into contact with an electric connection.The current increases when current flows to the ground through a low-resistance circuit. As a result of the increased heat created in the fuse wire, the fuse wire melts and the circuit is broken. This will safeguard both the instrument and the person who will be handling it.

Note:The most common nonfatal shock injury is electrical burns. When a worker comes into contact with electrified electrical wiring or equipment, they get electrocuted.Electrical burns can happen everywhere on the body, but they're most common on the hands and feet.