You should only charge your car from a normal household socket using a suitable (emergency) charging cable. The condition of the installation should be checked by a registered electrician in advance.
Electric vehicles can be charged from a professionally installed household socket, provided it is designed for a continuous load of 16 amperes, an output of 2.8 kW is not exceeded, and no other electric devices are connected in the same circuit. Only a registered electrician can verify if these requirements are met. However, since these requirements are not always met, it is mandatory to install an individual charging station on a separate circuit with an approved residual-current circuit breaker (RCCB). You should only charge your car from a normal household socket in an emergency.
Owing to the high power consumption in comparison to other household appliances over a period of several hours, the household socket as well as the cabling behind it will heat up when a vehicle is being charged from a normal household socket. If using a technically unsound installation or older cable, heat generation could lead to cable fires or melting household sockets. Moreover, due to the low charging output, charging from a household socket takes longer than from an installed charging station – such as a wallbox charger or a free-standing charging column.
Modern (emergency) charging cables have a control and protective device built into the charging cable. This limits the charging current to 13 amperes (approx. 2.8 kW) and monitors the temperature of the Schuko plug, which can lead to a further reduction of the charging current. In other words, charging with these (emergency) charging cables is safe, but relatively slow compared to charging via a wallbox.