On Tuesday, October 6, 2015 at 3:50:51 PM UTC-7, gregebert wrote: > > I dont know if it's still common practice, but many radios and small TVs > in the US in the 1960's & 1970's had a 'hot-chassis' where one side of the > AC line was connected to the metal interior chassis. Obviously, these > devices had non-conductive (usually plastic) cases. Polarized cords > supposedly ensured the neutral side was connected to the chassis, but > extension cords etc left it a 50-50 chance it was electrically hot. I cant > recall if any of these were UL listed, or not. >
Those are the "All American 5" (AA5) tube radios, which first came out in the late 30's. Various tube line ups, which changed as more modern tubes became available. Still being made into the early 70's. There were also TV sets made with hot chassis and series heater strings. Usually "portables". "Portable" being a 35 lb box with a handle on top. UL standards get superseded by newer ones, continually. I remember one time when there were 3 standards covering consumer products. I contacted UL, to ask which one I should use for a new product. Their reply was "pick one". But they also said, that the older ones would be phased out, and eventually there would only be one. So the AA5 probably met some long defunct UL standard. UL is not a government regulatory agency, but a private organization setup by the insurance industry. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/0d7d6c10-a3fb-4137-9cbd-ab4c65cb97ba%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
