EDIT: Based on some initial comments, I thought it would be fun to share run-ins with being zapped, shocked, jolted, and/or otherwise made uncomfortably intimate with electricity. Sometimes it's funny, sometimes it's not, but it always leaves an unforgettable impression and an occasional story. What's yours? See post 14+...
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Long before I got into the pinball hobby (uh (checks notes) almost 10 years ago holy crap) I spent a lot of my free time tinkering with electrical stuff. From model trains to computers to TVs to VCRs to stereos to turntables to cars to refrigerators to compressors to sewing machines to vacuums to fans to... you get the idea. If it fed on electrons and for some reason didn't work, it was fair game to take apart! Toward earning a respectably high success rate for diagnosing and/or fixing to operation. And household electrical work from circuit troubleshooting and adding, to large appliance and HVAC repair, has been pretty simple for me as well...
All of that is to say and not to brag that I know my way around electricity and its hazards. 'Cuz inevitably, I've been zapped enough - due both to my own lazy carelessness AND through no fault of my own! - to know the alarming, uncomfortable, spastic feeling of BZZZZZT! So I have a healthy respect for proper precautions as I've gotten older.
Anyway, the scenario: I was recently given a ~100 year old desktop fan - one of those awesome old steampunk-looking open-cage plane-prop hand-slicer jobs - that didn't work for various reasons. Among other issues it had been dropped such that the blades would hit the cage and get stuck, on top of needing a good cleaning. So I removed the bent cage, then turned it on... it wanted to work, but needed a manual assist and thus more disassembly to thoroughly clean.
Old motors like this are surprisingly easy to take apart and service: provided that the stator or rotor hasn't overheated and shorted (like a pinball solenoid) they can usually be brought back to life. So I unplugged it, took it apart and proceeded to clean out decades-old packed-in dust clots and rotten rubber and what have you. I removed the rotor and cleaned it first. Then I cleaned the frame housings. The AC leads were of course connected to the stator. I know it was unplugged. My oldest daughter saw that it was unplugged. And yet, when I picked up the stator I was bit! My hand locked, my arm shook, and after a moment I dropped the stator while my daughter asked with alarm what had just happened.
In truth, the zap wasn't that strong, nor the worst I'd ever felt. It barely lasted half a second and I might even compare it to a 9V battery on the tongue. I think it was the "shock" of being zapped by *a coil that was unplugged with no apparent capacitive design* that got me - in other words more a psych / surprise thing as opposed to dangerous current.
But still! There is no way that should have happened in the first place, right?!?! But as someone who's mostly been self taught as necessity and field needs dictate, maybe I missed an 200-level caution somewhere? Can a static coil winding retain a "charge" for some length of time? It had been unplugged for at least 10 minutes. I've taken similar motors apart in less time and never got zapped.
How many of you have ever taken unexpected doses of Electro-juice?