Getting power on at the new place tomorrow. They told us to make sure the mains switch was off, so I went round and did that. Wasn’t really sure how to read the switch (very old switch board) it had a O and a I instead of on and off. I guessed that O represented a circuit and I a broken circuit. Turns out, it is instead derived from binary, with I meaning on and O meaning off.
Now I have to go round there at 6:30AM to flip a switch.