That sounds like a brilliant guy. I was just in a course about electrical safety last week. The voltage that kills the most people is 120 VAC.
Jim On Feb 23, 2012, at 4:44 AM, DanKj wrote: > This discussion reminded me of a situation here, a few years back: The > power company replaced the wires from my house to the pole, and a few months > later, I happened to touch the metal pipe through which the wires ran to my > meter in the cellar. ZAP! The pipe had never been attached to the meter > box or my fuse/breaker box, both of which were grounded (after I grounded > them - NOTHING was grounded when I moved in here!) ... Anyway, I called > the company to have the thing repaired, as it was obvious that the live > conductor was touching the pipe at the top. They sent Vern & Ernest, I > swear. Even after I demonstrated the problem by lighting-up a 100W bulb > between the pipe and a ground, one of the guys grabbed both pieces of metal & > ZAPPED himself for proof! "Oh yeah, that's live." I guess he was accustomed > to 120volts AC! > > > > ----- Original Message ----- From: "Barry Kasindorf" > <[email protected]> > To: "Antique Phonograph List" <[email protected]> > Sent: Friday, February 17, 2012 1:43 PM > Subject: Re: [Phono-L] Does anyone know how to make a Jones Motrola _safe_? > > >> Very true. The question was SAFETY. I hate having 3 wire plugs on antique >> electronics. You can easily put a polarized plug on a piece of zipcord and >> get the ends right and be safe as well. I like the idea of making something >> SAFE without changing the item at all. >> -Barry >> >> >> On 2/17/2012 12:25 PM, Bruce wrote: >>> Barry, the shock hazard model during HiPot testing development assumes all >>> external metallic surfaces on a product are always at the same potential. >>> That is why we are only required to test against the product ground through >>> an alligator clamp to the chassis or through the ground terminal of the 3 >>> wire AC input. The shock hazard model we care about is a ground path through >>> the body past the heart. You could be standing on a concrete floor barefoot >>> or touching a cold water pipe with your other arm. >>> >>> I submit to you that I could connect any ungrounded electrical device >>> through my isolation transformer, float it up to 1500VAC (the isolation >>> voltage of my isolation transformer) and invite you to touch it and >>> depending on your resistance to ground, you will definitely feel it. It will >>> not be much current, and it may not kill you but it will wake you up faster >>> than a few cups of coffee. > > _______________________________________________ > Phono-L mailing list > http://phono-l.org _______________________________________________ Phono-L mailing list http://phono-l.org
