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6th Jul 2020, 10:56 pm | #1 |
Hexode
Join Date: Aug 2014
Location: Featherstone, West Yorkshire, UK.
Posts: 386
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Dangerous voltage
Whilst searching old issues of ETI (American Radio History website), I came across this cartoon.
Good reminder for technicians, ONE HAND BEHIND YOUR BACK WHEN WORKING ON A LIVE CHASSIS. Kevin Last edited by AC/HL; 7th Jul 2020 at 12:57 am. Reason: Attachment corrected |
7th Jul 2020, 1:34 am | #2 | |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,724
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Re: Dangerous voltage
Quote:
https://www.youtube.com/watch?v=G2RPu4Hs_qo
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7th Jul 2020, 6:55 am | #3 |
Nonode
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 2,300
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Re: Dangerous voltage
Ah, that makes more sense, I was puzzled by the original attachment.
The one hand behind your back rule makes sense to avoid an electric current passing from one hand to another through your heart but you still risk a serious shock from the hand to the floor. My previous employer used rubber mats in areas where live equipment was being worked on and this was very effective. We had an instance where a customer had miswired the plug on a unit to connect the live wire to chassis. Said chassis was handled while testing the unit without shock. Peter |
7th Jul 2020, 7:18 am | #4 | ||
Dekatron
Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,991
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Re: Dangerous voltage
Quote:
Just over 12 minutes in there is a good shot of a rack of Tektronix valved oscilloscopes. The one in the foreground is a 545A or B. The A had 75 valves in it. Quite a room heater. Craig Last edited by Craig Sawyers; 7th Jul 2020 at 7:24 am. |
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7th Jul 2020, 8:29 am | #5 |
Heptode
Join Date: Feb 2010
Location: Duffort, Gers, France
Posts: 714
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Re: Dangerous voltage
Indeed. I remember back in the 1970s when power was rationed during one of the miners' strikes. Only essential things were allowed to be switched on which excluded electric heaters, so our lab was very cold. Inspectors went around to make sure that the regulations were being complied with. Obviously it was essential to make sure that the mains supply had no nasty spikes on it, so we connected the probes of our oscilloscope to a mains socket and removed its cover. We were nice and warm after than.
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7th Jul 2020, 8:33 am | #6 |
Heptode
Join Date: Apr 2003
Location: Ayr, Ayrshire, UK.
Posts: 631
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Re: Dangerous voltage
Yes, that's a very memorable image !
I saw it in my copy of ETI at the time and posted a copy in this thread back in 2010 https://www.vintage-radio.net/forum/...197#post381197 Andy
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7th Jul 2020, 1:27 pm | #7 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,724
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Re: Dangerous voltage
I always thought it was Harwell, but I've just noticed Culham mentioned in the opening credits.
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