Power Reaches Home

Why it matters

The electricity in your fan travelled through a power station, giant pylons and two transformers before it dared enter your house at a polite 220 volts.

The idea in plain words

The last metres into your home. Tap the wires.

live · neutral · earth

Why is the switch placed in the LIVE wire, never the neutral?

The live wire is the one that must be interrupted

• wire 1: live (red/brown) — the dangerous wire at 220 V — switches and fuses always sit here
• wire 2: neutral (black/blue) — the return path — completes every circuit
• wire 3: earth (green) — the safety wire to a buried plate — carries current only during a fault
• Switch off the live → the appliance is truly dead
• Switch the neutral → everything still sits at 220 V, waiting

Predict first

Electricity travels cross-country at very HIGH voltage because…

Same power at higher V needs less I — and heating loss follows the current. Step up to travel, step down to be safe at home.

• high voltage means low current — thin wires and less heat loss — correct
• high voltage travels faster
• pylons require it

What you do

Place the right transformer at each end of the journey: cheap travel, safe arrival.

Check yourself

The supply enters your house through, in order,…

Protection, counting, control, distribution — the fixed order of every installation.

The earth wire is connected to…

Literal earth — the planet is the emergency drain for fault currents.

In the (old) colour code, green always means…

Green is safety in every code, old or new (green-yellow) — never trust it to be dead, but never fuse it either.

• company fuse → meter → main switch → distribution board — correct
• main switch → meter → fuse
• straight to the sockets
• a metal plate buried in the ground — correct
• the power station
• the neutral at your meter
• earth — the safety wire — correct
• live
• neutral