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Every Christmas light string I have seen has had a small fuse inside of the plug, so even if you managed to get a female plug full of water or something and somehow manage to get shocked before a breaker trips in the outlet, you’re probably just going to blow the fuse.
Every Christmas light I’ve ever seen were all low voltage. The last Christmas light that was directly into main power instead of having a power convertor plug was decades ago. I guess that’s EU regulations at work.