Question

The main fuse is connected in:
A. Live wire
B. Neutral wire
C. Both the live and earth wires
D. Both earth and neutral wire

Answer 1

Hint: The main fuse is related to the kWh meter. These kWh meters have wires coming out from their output terminals to which the main fuse is connected. These wires should have a high potential to prevent damage. It is connected between the kWh meter and distribution board of the house circuit.

Complete answer:
kWh meter is an electric meter that measures the amount of electrical energy that was consumed within the house. These kWh meters have live wires coming out from their output terminals. These live wires have another fuse in it which is called the main fuse.
This fuse is connected in series with the live wires. Then they are connected to our houses, offices, etc. Fuse has a maximum limit of 50A. If the current exceeds this maximum limit, the fuse starts melting, and thus breaks the circuit. To prevent this kind of damage, the main fuse is connected in live wires. When the fuse blows, it disconnects the appliances from the live wire which has a high potential and prevents the appliance from getting charged.
If the main fuse is connected to neutral or earth wire, then the current across the wire flows in excess but doesn’t get disconnected. If there’s an electric shock or leakage then the circuit still has the connection with the supply, and this will result in electrical damage and thus, can cause serious loss.

So, the correct answer is “Option A”.

Note:
The neutral wires carry zero potential while these live wires have a high potential of nearly 220V. Earth wires are directly connected to the ground, thus they have zero potential. Hence, live wires are used. A fuse wire is connected in series with these live wires. It is used to protect the circuit from large amounts of current flow as it can cause damage to the circuit.