You should never connect these devices to multiple outlets
Natural Law No. 4568 states: There are never enough electrical connections in the house. That’s why most of us rely on the good old multi-plugs. Unfortunately, this solution also has its drawbacks, as not all devices are suitable for multiple sockets.
What these are and what could happen in the worst case can be read below:
Stoves with a built-in burner should always be plugged into a high-voltage socket, as they usually exceed the conventional maximum power of multiple sockets (about 3,000 to 3,500 watts). The development of extreme heat may cause cables to melt and, in extreme cases, cause a cable fire.
Other multiple sockets
No “system hacking”: Never connect multiple sockets to their own sockets, but use extension cables. In this case, the risk of overperformance is very high.
Dryers, old refrigerators or air conditioners consume a lot of electricity and are therefore not suitable for multiple outlets to which other appliances are connected. You should also use kettles with caution. For maximum fill, these require about 2000 to 3000 watts, thus probably the full power of multiple plugs.
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General tips for multiple sockets
You can find the maximum power of multiple plugs either near the switch or at the bottom of the power strip.
If this power is exceeded, there is a risk of cable overheating or even fire. So pay attention to how much wattage the connected devices require when turned on.
Buy only high quality multi sockets with TÜV GS test seal (beware of fakes).
Avoid multiple sockets in damp rooms such as bathrooms or in the kitchen sink area.
Make sure the multiple plugs have enough air circulation and are not covered or pressed between the wall and furniture (promotes overheating).
Never place power strips next to flammable objects such as boxes or curtains.