I pretty much only do it with low-power wallwarts, and only on extension cables (fused to 13A or less) since it's easier to bypass gates on those than a wall so

I pretty much only do it with low-power wallwarts, and only on extension cables (fused to 13A or less) since it's easier to bypass gates on those than a wall socket. My main concern is reduced contact area from putting a circular peg in a rectangular hole. Still, I should get and use an adapter since they're cheap even if standard compliance is a bit random.