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Old 13th May 2020, 2:37 pm   #61
Hybrid tellies
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Default Re: Live Chassis Safety

When I started work in the R&TV repair trade all televisions, colour and black and white, were AC/DC or potentially live chassis. We never used isolating transformers and did a lot, most, repairs in customers houses. We were all armed with a neon testing screwdriver and the first thing you did was to check to see if the chassis was live or not. If it was live it was down to the on off switch being wired incorrectly from a previous repair or the 13A plug being wired incorrectly with live and neutral wires around the wrong way. Very occasionally the live neutral reversal was in the mains wall socket and very rarely back at the main house fuse box.
Relying on a mains neon tester would be frowned on today but they never let us down.
I did not like the later half mains technique but we still faulted them without using isolating transformers. We just had to stay alert.
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Old 13th May 2020, 3:57 pm   #62
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Default Re: Live Chassis Safety

PAT, I have never seen anyone take the top of a plug off to inspect the wiring.

Back on topic and summarising the OPs question, if you can't tell which wire the chassis is connected to it doesn't matter.
 
Old 13th May 2020, 4:29 pm   #63
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Default Re: Live Chassis Safety

Myself, Simon & quite a few other Forum members I reckon have had decent training and experience in electrical engineering/radio/tv/telecoms/military/etc. Some of us(quite a few of us ?) are clocking on a bit, having been trained in the 50's,60',or 70's. Maybe Forum Moderators can tell us(or guess) the approx. ratio of formally trained folk to keen hobbyist folk in the vintage fraternity. What - maybe 1 : 10 ?
My views, sometimes expressed in a forthright manner, are merely to encourage young entrants &/or new inexperienced folk to take safety & safe working practice very carefully. Some of the thought expressed in this thread & other past threads, by the old brigade, might (but hopefully not) encourage the young-uns to take risks.
We have the analogy of vintage cars, which - yes - can be driven at speed on the UK's road network, & even raced. But, & its a big BUT, I doubt very much if the owners run them with ancient brake pipework, worn out brake drums, rusted suspension & bodywork, knackered old tyres, etc. - just in the name of original authenticity.

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Old 13th May 2020, 4:38 pm   #64
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Default Re: Live Chassis Safety

I reckon I'm far more likely to kill myself or someone else whilst driving my classic car than I'm likely to kill someone by selling them a restored AC/DC radio.
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Old 13th May 2020, 4:41 pm   #65
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Default Re: Live Chassis Safety

The analogy with wear-and-tear doesn't really work. Having a live chassis is a feature of a radio set's design, as having no airbags is a feature of an older car's design. If a wireless becomes less safe because insulation has worn, or an earth contact has corroded, then there is a much stronger case for putting that right, or preserving the original component and taking the set out of service as a museum piece. The case for altering an early wireless's design to convert it into a modern wireless is what I'm calling into question.

Cheers,

GJ
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Old 13th May 2020, 4:45 pm   #66
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Default Re: Live Chassis Safety

Quote:
Originally Posted by merlinmaxwell View Post
PAT, I have never seen anyone take the top of a plug off to inspect the wiring.
I used to work in a place where the covers were taken off plugs and the insides inspected. The plug then received a sticker which prominently displayed its expiry date. If the expiry date arrived then you weren't allowed to use that piece of equipment until the plug inspector had carried out a new inspection and replaced the sticker. If the safety officer caught you using something with an expired plug there was trouble.
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Old 13th May 2020, 5:09 pm   #67
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Default Re: Live Chassis Safety

And in that vein I'll put an expiry sticker on here.
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