Back in 1976, I worked for Warwick Electronics which made private label TVs for Sears and Kmart. I was scared of the 25kV second anode voltage on the CRTs, not only did the picture tube itself hold a charge after you powered down the chassis, but they used capacitor/diode voltage multipliers which also held a charge. It was standard practice to discharge the CRT with a clip lead and screwdriver. Safe but still scary. We also used an electrostatic voltmeter to measure the anode voltage and that was a giant capacitor that could hold a charge for hours.
But one of the HV design engineers electrocuted himself. Ironically not at work, but at home on his ham radio rig. Supposedly the plate voltage on the output tube got shorted to the Morse code key. Something like 1000+ VDC. Wife immediately called 911 but they couldn’t restart his heart. From: AF <af-boun...@af.afmug.com> On Behalf Of Chuck Sent: Sunday, October 27, 2024 11:11 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] OT 480v I almost always work them bare handed and hot. Try to keep one hand out of the circuit. 120 doesn’t bother me too much. I don’t even start feeling it until 80 it 90 volts. Have demoed that with a variac. It the 277 jolt was felt in my pecs. I did get 600 VDC solar circuit across a hand once, not too bad. Spark plug wires hurt like a MF. RF burns pretty bad too. Got nailed by conducted 2.4 gHZ 2000 W circuit. That was like picking up a piece of white hot metal. Last but not least, bypassed interlocks on a microwave oven. Briefly stuck my hand in to see what it feels like. Feels like running like quickly runnng your hand ✋ ver campfire flames. Sent from my iPhone On Oct 27, 2024, at 9:45 AM, Ken Hohhof <khoh...@kwom.com <mailto:khoh...@kwom.com> > wrote: Supposedly there's a one hand behind your back or in your pocket rule to prevent what happened to Chuck. Doesn't seem practical to me. ---- Original Message ---- From: "Bill Prince" Sent: 10/27/2024 10:32:43 AM To: "AnimalFarm Microwave Users Group" Subject: Re: [AFMUG] OT 480v Yeah. Should have clarified that. Not all new circuits. It's an older home with outdated wiring. So I think there were a couple new circuits, but there was plenty of other type of work. The friend was pointing out that the guy was working with live wires in several places. -- bp part15sbs{at}gmail{dot}com On Sun, Oct 27, 2024 at 7:57?AM Ken Hohhof <khoh...@kwom.com <mailto:khoh...@kwom.com> > wrote: If they were totally new circuits and the last connection was at the breaker panel, that might not be as remarkable as it sounds. ---- Original Message ---- From: "Bill Prince" Sent: 10/27/2024 9:45:45 AM To: "AnimalFarm Microwave Users Group" Subject: Re: [AFMUG] OT 480v I have a friend who hired an electrician to do a couple of new circuits in his home. According to my friend, the guy did all the wiring bare-handed and without turning anything off. When I do that kind of thing, I at least wear some gloves. Zipping and zapping is not my favorite thing. -- bp part15sbs{at}gmail{dot}com On Sat, Oct 26, 2024 at 10:13?PM Robert <i...@avantwireless.com <mailto:i...@avantwireless.com> > wrote: glad you are still around.... On 10/26/24 9:53 PM, Chuck wrote: > 480 is 277 single phase to ground. I got it from one hand to the other the > other day. Both arms, across the chest First time getting shocked from a 480 > circuit. Very invigorating. Would not recommend. Really makes you feel > alive. I don’t think I need to experience phase to phase. > Sent from my iPhone > -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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