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Top pin of three pin plug connected to?
Earth wire
Phase wire
Neutral wire
Any of above
Earth wire
In a standard three-pin plug, the top pin is thicker and longer than the other two pins and is dedicated to the Earth (or Ground) connection. This ensures that the earth contact is made first when plugging in and broken last when unplugging, providing maximum safety.
In a standard three-pin plug, the top pin is thicker and longer than the other two pins and is dedicated to the Earth (or Ground) connection. This ensures that the earth contact is made first when plugging in and broken last when unplugging, providing maximum safety.
IfaultтАЛ=ZearthтАЛVтАЛ тАФ current flowing through the earth loop during a fault condition
The Earth pin is connected to the metallic body of the appliance. In the event of a fault where a live wire touches the metal casing, the low-resistance path of the Earth wire allows a high fault current to flow, which trips the circuit breaker or blows the fuse, preventing electric shock to the user.
The earth pin is longer to ensure it connects before the phase and neutral pins.
The earth pin is thicker to prevent it from being accidentally inserted into the phase or neutral sockets.
Earthing is a critical safety measure against leakage current and short-circuit hazards.
Standard color coding in India (IS 694) is Green or Yellow-Green for Earth.
Protects users from lethal electric shocks during appliance faults.
Prevents fire hazards by ensuring rapid isolation of faulty circuits.
Requires proper earthing electrode installation at the building premises.
Increased installation complexity for older structures.
High-power domestic appliances like refrigerators, washing machines, and geysers.
Electronic devices with metallic chassis.
Option B (Phase) is usually located on the right side of a standard 3-pin socket.
Option C (Neutral) is usually located on the left side of a standard 3-pin socket.
The Earth pin's length advantage is a mandatory feature under electrical safety standards (IS 1293).
A is correct тАФ The top pin of a three-pin plug is specifically designated for the Earth connection to ensure safety.
Remember the 'Left-Neutral, Right-Phase, Top-Earth' rule to quickly identify wiring connections in competitive exams.