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Old 6th Jul 2020, 10:56 pm   #1
kevinaston1
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Default 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
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Old 7th Jul 2020, 1:34 am   #2
Graham G3ZVT
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Default Re: Dangerous voltage

Quote:
Originally Posted by kevinaston1 View Post
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
Nah, an image like that makes me remember "S.I.D.E." AKA "It's the ****** coil!"
https://www.youtube.com/watch?v=G2RPu4Hs_qo
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Old 7th Jul 2020, 6:55 am   #3
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Default 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
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Old 7th Jul 2020, 7:18 am   #4
Craig Sawyers
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Default Re: Dangerous voltage

Quote:
Originally Posted by rambo1152 View Post
Quote:
Originally Posted by kevinaston1 View Post
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
Nah, an image like that makes me remember "S.I.D.E." AKA "It's the ****** coil!"
https://www.youtube.com/watch?v=G2RPu4Hs_qo
I remember watching that as a kid - I think it was a trade test film. Looking at the facility, I think it must have been at the early version of fusion research at Culham, or at RAL.

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

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Old 7th Jul 2020, 8:29 am   #5
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Default Re: Dangerous voltage

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The A had 75 valves in it. Quite a room heater.

Craig
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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Old 7th Jul 2020, 8:33 am   #6
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Default 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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Old 7th Jul 2020, 1:27 pm   #7
Graham G3ZVT
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Default Re: Dangerous voltage

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Originally Posted by Craig Sawyers View Post

I remember watching that as a kid - I think it was a trade test film. Looking at the facility, I think it must have been at the early version of fusion research at Culham, or at RAL.

Craig
I always thought it was Harwell, but I've just noticed Culham mentioned in the opening credits.
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