Can electrical appliances be left on 24/7?

Question

Physics

Is it possible to keep appliances turned on around the clock, for example, a printer? And what does it mean for the device?

Answer 1

Can. In the hypothetical case that there will be a sharp and strong surge in voltage upwards, there is a non-zero chance that all equipment physically connected to the mains will burn out.

Answer 2

You can., it's even better for appliances than turning it on and off, basically all breakdowns occur at these moments