Over here, we banned anything that plugged into a light socket, that is not a bulb,
years ago, mainly because of the likely-hood of having the switch in the Neutral,if the lampholder is incorrectly wired.
The biggest problem, was with Bayonet Cap lampholders, using the adaptors we used to have here,people used to hook all sorts of things into them, heaters,record- players,and the odd toaster, if the fuse blows, just put a bigger fuse wire in the
fuse-holder, this has burned down a few houses that I can think of. [Linked Image]: