Thread: I’m an idiot!
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Old 6th Aug 2022, 6:08 pm   #70
Pfraser
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Join Date: Sep 2018
Location: Devon, UK.
Posts: 151
Default Re: I’m an idiot!

Quote:
Originally Posted by Electronpusher0 View Post
I used to work on X-ray machines, these went up to 150kV. The cables between the transformer and tube were about 2 inches thick and the plugs and sockets were oil filled.
The oil would start to break down after a while, the best check for this was to sniff the end of the plug. Problem was that the cable had significant capacitance and would hold a charge for a very long time. Standard procedure was to discharge the cable by holding the plug against ground.
Most engineers I worked with had a small scar on the end of their nose where they had forgotten and drew a large spark between the cable and nose.

Peter
I did something similar whilst experimenting with an old valve radio chassis. I was always careful to disconnect mains power before carrying out adjustments, but I was not so mindful of charged HT capacitors.

Leaning gradually forwards to inspect the circuitry whilst holding the chassis, my nose came closer to an exposed connection...zap! I sat up straight, smartly!
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