A tech at a company I was at was tired and not thinking clearly

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And that is rule number one about electrical safety. If you are tired or if you have become frustrated that something doesn't work, the last place you need to be is around high volts. Personally, I only mess with important stuff (electrical, electronic or software) at weekends or a day off; weekday evenings are for non-critical hacking and reading. Professionally, there have been many occasions when I have been compelled to work under stress, but the results were less than perfect.