Author Topic: Fatal accident using MOT  (Read 452 times)

Offline klugesmith

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Fatal accident using MOT
« on: May 25, 2022, 11:02:14 PM »
A few years ago, it became popular for woodworkers to burn fractal "Lichtenberg" figures into the surface, using MOT's.

https://www.woodfloorbusiness.com/installation/extraordinary-floors/article/15132850/frankenstein-flooring-from-an-idaho-floor-man
presents


Before long there were reports of electrocution, in the literal sense (fatal electric shock).
This unfortunate couple died, and later the electricity started a fire that burned down the workshop.
https://www.woodfloorbusiness.com/news/article/15291241/two-die-of-electrocution-after-fractal-wood-burning-accident

Offline MRMILSTAR

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Re: Fatal accident using MOT
« Reply #1 on: May 26, 2022, 05:21:36 AM »
I have personal experience with this. One of my son's friends was killed several years ago by electrocution when doing wood burning with a MOT.
Steve White
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Retired electrical engineer

Offline davekni

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Re: Fatal accident using MOT
« Reply #2 on: May 26, 2022, 06:32:47 AM »
A while back, around 2010, a man in my town (Wilsonville, OR, USA) was electrocuted in the same way, burning Lichtenberg figures in wood using a MOT.  (BTW, Lichtenberg patterns are not fractals.  Fractals have the same characteristics at any viewing zoom level.)

Burning Lichtenberg patterns onto wood (and even cardboard) is fun and much safer using electronic neon sign supplies.  High frequency is much safer, and most supplies include ground-fault shutdown.  Internal overload and under-load shutdown circuits induce limits on wood coating conductivity.  Limits are well within typical conditions.  A momentary foot switch on incoming line voltage to electronic NST makes restarting easy and adds a bit more safety.
David Knierim

Offline Mads Barnkob

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Re: Fatal accident using MOT
« Reply #3 on: May 26, 2022, 07:45:49 AM »
Unfortunately this is not something related to MOTs, but the ignorance of dangers and willingness to bypass safety warnings.

More stickers on Microwave Ovens will not fix this. Then a dangerous high voltage source is just found elsewhere.

I do not even know where to start, to fix lacking self awareness of self preservation.
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Offline Hydron

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Re: Fatal accident using MOT
« Reply #4 on: May 26, 2022, 10:50:54 PM »
MOTs are particularly easy to get hold of though, and pretty much the most dangerous electrical thing around that is accessible (without using a ladder to climb up a power pole). Not many other household objects output instant-death!

Offline klugesmith

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Re: Fatal accident using MOT
« Reply #5 on: May 27, 2022, 05:52:07 AM »
 >> Not many other household objects output instant-death!

Automobiles and guns come to mind, but their functions and hazards are obvious to most ordinary people.

Offline Hydron

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Re: Fatal accident using MOT
« Reply #6 on: May 27, 2022, 11:13:55 AM »
I'd argue that guns aren't a normal household object for much of the world (I'll grant you automobiles, but I don't have one of those currently either!)

But yes, not so obvious to ordinary people that the danger from a MOT is on a totally different level to the danger from general poking around with household mains electricity.

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Re: Fatal accident using MOT
« Reply #6 on: May 27, 2022, 11:13:55 AM »

 


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