Here’s a list of items that should never be connected to a power strip:

Oven: Due to its high energy consumption, it should always be connected to a separate wall outlet.
Refrigerator: Although it doesn’t consume as much energy as an oven, it’s best to use an extension cable directly with it instead of a power strip due to the constant voltage it requires.
Washing machine and tumble dryer: These appliances consume significant electricity and should be plugged directly into an electrical outlet to prevent overheating or short-circuiting.