For a real fun time you can demonstrate someone inserting a standard NEMA 1-15 or 5-15 plug into a standard wall outlet while "accidentally" touching the hot leg and listen to all the queries as to how that design could persist for so long. The power of the purse.
-Dave -----Original Message----- From: John Allen [mailto:[email protected]] Sent: Wednesday, September 02, 2015 3:29 PM To: [email protected] Subject: Re: [PSES] PSES Symposium 2016 - Compliance 101 Track demo When he was at HP many (about 40 IIRC) years ago, Al Kanode ran some demos (participated myself, and it was "interesting!) like that - anyone have any film (before the days of home videos!) of one of those ? On my side, I helped to design and install the electrical side of an exhibit at the London Science Museum in 2004/2005 to demonstrate that you can't see electrical energy but it really does exist. It consisted (briefly!) of a tall metal column connected to a shock source (a low-power electric fence energiser with external ballasting to reduce the shock current to a much lower level than the max in most standards) - people touched it with the fingers, and when they did they got a slight shock and there was a loud noise from the associated sound system. See this video of it for a laugh https://vimeo.com/31445076. The critical part of the design that I added was the shock circuit was only between the inner core of the centre section and the fairly closely packed metal rods surrounding it - and you could only insert a couple of fingers at a time, and thus you would get the shock between the fingers on one hand. OTOH, in the original design (before I got involved!), you got the shock between the cylinder - which had no centre section at that time - and the floor, and that, coupled with the use of a much more powerful fence energizer, meant a MUCH bigger "belt" which no-body in their right mind would want in a public place like that. Literally thousands of people (including lots of kids!) played with this thing - sometimes for protracted periods - and, AFAIK, no-one got even mildly hurt! Surely something like that could be demonstrated, with the well-publicised warning that that the higher the shock current then the "bigger" the effect would be? John Allen W.London, UK -----Original Message----- From: Pete Perkins [mailto:[email protected]] Sent: 02 September 2015 17:12 To: [email protected] Subject: Re: [PSES] PSES Symposium 2016 - Compliance 101 Track demo Dan et al, A flamboyant demonstration; not sure that a person needs to shock his tongue - an organ with lots of sensors built-in. Seems like something left over from a horror movie (or real life experience in some cultures since the introduction of electricity 100 years ago or so). There is a lot of good technical information available on electric shock - starting from the 1930s (Whittaker) thru the 1950s (especially Dalziel) and more recently (e.g. 1983 & 1986 ES symposiums). This technical material is summarized in IEC 60479 series of Basic Safety standards which are to be used by equipment committees. I have given a number of electric shock presentations at the IEEE PSES/ISPCE meetings since the first meeting of this group. I have been involved in electric shock demonstrations both as a subject (see my PSES08 presentation on body impedance calculations) and as a demonstrator with hundreds of participants over the years. The demo allows the participant to feel the startle-reaction current (0.5mArms) and just short of the letgo-immobilization current (3.5mArms demo) as defined in the technical standards we commonly deal with; the distributions of current between these two levels is widespread, as shown in my papers. Nute & I have sought permission from the IEEE to give a demo at the meetings and it was refused because of the liability issues. The PSES management committee is familiar with the effort. Watching a video is interesting (and, as has been pointed out, you can watch it on YouTube). Watching a person get a live shock is more interesting (hopefully not some prurient interest here). Participating in a safe electric shock demo is revealing and qualitative, leaving a lasting impression on most participants. My compliance 101 demo has not used a video or a demo; there is a lot more important technical information to present in the short time allotted. If folks want to watch YouTube videos we could set up a table in the exhibit hall and let them run non-stop. C'mon down and I'll give the scoop on electric shock (jra consenting) including dealing with modern switching supplies and the issues introduced at the product level which must be measured and remain in compliance to the long-standing requirements. There's more here than meets the eye. :>) br, Pete Peter E Perkins, PE Principal Product Safety Engineer PO Box 23427 Tigard, ORe 97281-3427 503/452-1201 fone/fax [email protected] _ _ _ _ _ Thanks Dan, Pretty funny guy!! Not sure if PSES would allow live demos. Best Regards, John John Allen President Product Safety Consulting, Inc. http://www.productsafetyinc.com 630-238-0188 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
