Daisy chaining is a term that refers to the practice of plugging a power strip into another power strip. This is dangerous because an excessive amount of power is being drawn from one single wall outlet, which means the power strip or wall receptacle could easily overload.

Are daisy chains bad?

The proper use of a power strip usually does not cause a hazard. ... It's the improper use that can cause safety issues, such as creating a potential electrical failure and/or a possible fire hazard. An example of using power strips unsafely is when they are “daisy chained” together.

Is daisy-chaining extension leads safe?

"This situation is made far more dangerous when extension leads are plugged into each other, otherwise known as 'daisy chaining'. As the number of appliances that can be connected to a single power outlet increases, the likelihood of circuit overload also increases."