this post was submitted on 18 Mar 2024
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This is the sort of person who thinks you need to ground yourself to be safe while working with electricity. Not 100% wrong, but just wrong enough to be very, very dangerous.
Some people know just enough to be dangerous.
For instance, an anecdote:
A nearby local hardware store put up a sign in 2017 and now this year, in front of the welding equipment, that says "WELDING GOGGLES DO NOT PROTECT EYES AGAINST THE SUN"
Now if they didn't block uv from the sun, then they wouldn't block uv from your welding arc.
BUT I 100% stand by their choice to put the sign up.
Because you need a certain shade or darker, and they sell a lot of different shades for different welding applications, including the safety tints people might want if they're nearby and catch the occasional reflection.
And some people know enough to know welding arc = UV, sun = uv, and don't stop to think about intensity.
In fact, in 2017, I knew someone who tried to use a #3 lense to look at the total eclipse, and as soon as the moon cleared moved enough for the sun to peek back, he deeply regretted not using a darker shade. Now has a weird spot in his vision that isn't quite right.
A 3 is what my helmet gives me for grinding mode, that’s nothing.
I used a 10 or 11 for one eclipse and it worked alright.
Just ground your left hand while you work on it with your right hand. That way if it’s live it’ll quickly stop your heart and you won’t even know you died. No half measures!
Working with small ESD-sensitive electronics and using a proper grounding strap and mat with large resistors in series to provide protection from shock? Absolutely.
Wiring up a car battery or working with mains power? Absolutely not.
Car battery on its own won't kill you, though wiring many in series might. There can also be some effects from DC sparks and welding on even 12V, which might cause other problems.