In the wiring of houses, the fuse is connected to the wire coloured

Analyze the question: The question asks which wire in house wiring has the fuse connected to it.

Concept: In domestic wiring (the colour code used in Nigeria and the UK), there are three wires:

• Live wire: brown. It carries current from the supply to the appliance.
• Neutral wire: blue. It completes the circuit and returns current.
• Earth wire: yellow and green. It is a safety wire that leads to the ground.

Where the fuse goes: A fuse protects an appliance by melting when the current is too high. To cut off the dangerous high voltage completely, it must be placed in the live wire. If it were in the neutral, the appliance would still be connected to the live wire (at high potential) even after the fuse blew, and that could cause electric shock.

Solution:

• Fuse → live wire
• Live wire → brown

Answer: B (brown)

Tip: Remember "Brown is Burning (live); Blue is Back (neutral); Green and yellow is Ground (earth)." Switches and fuses always go on the live (brown) wire.