From the power station to the home

The electricity in a home comes from the national grid.

Power station → Step-up transformer: 132 kV or 220 kV → National grid → Grid substation: 33 kV or 11 kV → Home: 230 V

The home supply is alternating current at 230 V with a frequency of 50 Hz.

Figure to be added

Figure 10.3 — how a home is supplied: the distribution line and service cable, the overload breaker, meter, consumer unit, a lamp, a switch, a socket and the earth.

Label	Part
A	Distribution line
B	Service cable
C	Overload circuit breaker (or service fuse)
D	Electricity meter
E	Isolator (or main switch with fuse)
F	Residual current circuit breaker (RCCB), or trip switch
G	Miniature circuit breaker (MCB) or fuse
H	Switch
I	Socket
J	Earth conductor
K	Lamp