There's also the age of the facilities. There are food plants here which still have areas with bars on the doors/windows, because they were around in WW2, and close to a very large POW camp, where some of the prisoners would work, and sometimes stay overnight.

Now imagine all the fuckery since then with the electrical being overhauled to fit more and more increasing automation. Frankly, places like that, one should be surprised they still serve and function within legal parameters.