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#1
Posted to rec.audio.opinion
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Francois, who died?
Know any specific case of someone who died as a consequence of the cheater
plug tweak? Not in a planet of six billion individuals? Golly, it must be a serious hazard. Francois, be sure to ground your umbrella. |
#2
Posted to rec.audio.opinion
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Francois, who died?
Robert Morein wrote: Know any specific case of someone who died as a consequence of the cheater plug tweak? Not in a planet of six billion individuals? Golly, it must be a serious hazard. Francois, be sure to ground your umbrella. Ok Bob, let me relate to you my personal experience. In high school electronics class our dumbass teacher whose name we'll call Bob just because it seems appropriate, wanted to show us how the old tec scopes we had could be used as differential input if you floated the scope with a cheater plug. If you didn't the scope probe ground was earth ground. So like good little students we did as we were told and started taking differential measurements. Some kid from the bench behind me reached over to touch my arm to get my attention. Next thing I know both of us were on the ground having been severly jolted. What we found was that some of the filter caps were tied to chassis ground and therefore floating the chassis put some AC on the chassis. The kids bench behind me was on the other leg of 110 so between his chassis and mine there was enough juice to knock me off my chair. When he reached out and touched me the path was closed...no need for ground etc. You want to know where theres a ground in your living room? Every piece of gear with 3 prong plug probably has its chassis tied to earth ground. If you float a chassis and it isn't tied to other chassis grounds and your one gear has a fault that results in AC on the chassis and you touch them both.... you could get popped. Now one could go through the system and make sure that lifting one piece of gears ground doesn't really float the chassis so that it remains grounded through connections to other equipment so should a fault develop...no harm will come... but you don't talk of that at all. ScottW |
#3
Posted to rec.audio.opinion
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Francois, who died?
"ScottW" wrote in message ups.com... Robert Morein wrote: Know any specific case of someone who died as a consequence of the cheater plug tweak? Not in a planet of six billion individuals? Golly, it must be a serious hazard. Francois, be sure to ground your umbrella. Ok Bob, let me relate to you my personal experience. Scott, we've all had experiences like that. It is not relevant to the current discussion. [snip nonsequitur] Not my living room, Scott. I say, make sure there's no good ground nearby. That includes three wire grounded equipment. If you float a chassis and it isn't tied to other chassis grounds and your one gear has a fault that results in AC on the chassis and you touch them both.... you could get popped. No, because as part of the recipe, a GFCI is required. Now one could go through the system and make sure that lifting one piece of gears ground doesn't really float the chassis so that it remains grounded through connections to other equipment so should a fault develop...no harm will come... but you don't talk of that at all. I believe I said enough, but your additional words are good. An audio system is tied together with interconnects. If one has a ground fault, the GFCI will immediately break the circuit. Perhaps somewhere, someone has an isolated piece of three wire equipment that could serve as a ground. If this equipment is not tied to the two wire equipment with interconnects, it could serve as a ground, and therefore, a hazard. However, for an accident to happen, three other things have to happen first: 1. A piece of equipment, either with a 2 wire plug, or a three wire with lifted ground via cheater plug, has become defective, with absolutely no other symptom, such as extreme hum, which is either unlikely or impossible. 2. The GFCI must be defective. 3. The user touches both pieces of equipment simultaneously. |
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