Question

The diagram in Fig. shows a three-pin socket marked as 1, 2 and 3. To which wire is the fuse connected ?

• A. 3
• B. 2
• C. 1
• D. 1 and 3

Answer 1

The correct option is A 3

In the given diagram, the marking 1 indicates the earth wire, marking 2 indicates the neutral wire and the marking 3 indicates the live wire.
The LIVE wire is RED OR BROWN. This is connected to a fuse on the live pin. The electric current uses the live wire as its route in.
The NEUTRAL wire is BLUE OR BLACK. This is the route the electric current takes when it exits an appliance; it is for this reason the neutral wire has a voltage close to zero.
The EARTH wire is GREEN OR YELLOW and connected to the earth pin. This is used when the appliance has a metal casing to take any current away if the live wire comes in contact with the casing.
Below is the diagrammatic representation of the 3 pin socket.
The live wires coming out from the output terminals of kWh meter has a fuse in it called the main fuse.
The fuse is connected in series with the live wire. This is done so because it is only the live wire which has a high potential of 220 volts unlike the neutral wire which carries zero potential. The fuse has a high rating of about 50 amperes. Thus it prevents any damage such as fire to the entire electrical wiring entering the house due to short-circuit or overloading.