Corporations get away with so much putting conflict resolution behind customer service hell.
I don’t blame the workers at all, I’m sure they have “unprecedented call volume” all the time which means short staffed with stressed out people trying their best.
From memory it was anything with an exposed heat source or high wattage- Toaster, hot plate, personal space heater, microwave, toaster oven, hair dryer, fondue fountain are what come from my memory. (At our desks mind you)
We had at least 3 microwaves in our floors break room, a few toasters, fridges, etc. Thinking about it, it was less about disturbing others or personal injury and more about fire hazards.
If it were just the heat source then I could probably get away with my stand mixer. Not sure if that qualifies as “high voltage.”