"They could turn the switch OFF entirely and still get zapped."
How? If the switch has cut off the hot wire's current, where do you get current from to get shocked?
"This is why we tell people to turn the power off at the breaker, not the switch, when they work on a light - the breaker kills BOTH legs."
What kind of panel does this at 110V? The only panels I've worked on had the hot wire only on the 110 breakers.
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