[Marsupial]

Agreeing with codefox.

Unless you have tested them, consider they might be wrongly wired. In my house, most of the ones in the basement had to be rewired;

some had hot & neutral reversed.
some had no ground
some I still don't understand what they were trying to do when they wired that.



Now, without betting your life on it, having safety measures can't be as worst than having none.