> nothing stops you from plugging a space heater into the outlet at the end of a string. I think a lot of christmas lights come with unpolarized plugs to make

> nothing stops you from plugging a space heater into the outlet at the end of a string. I think a lot of christmas lights come with unpolarized plugs to make this more challenging. Also the tiny (3amp?) built-in fuses give you an extra level of protection beyond what you'd get with a simple extension cord of similar specs.