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#171
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#172
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Good point for safety, year or so ago, a new ham lost his life
while putting up an antenna on the roof of a friends home, also a new ham. The antenna contacted house power lines. 73 joe Avery wrote: clipped.... I mention this because amateur radio nearly always involves outside antennas in urban areas close to utility power wiring on poles. The possibility of fatal or terrible electric shock isn't confined to some radio-electronic box interior...it exists out in the open, in plain sight. Keep it in mind to avoid frying that mind. Len Anderson retired (and still living) electronic engineer person |
#173
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Good point for safety, year or so ago, a new ham lost his life
while putting up an antenna on the roof of a friends home, also a new ham. The antenna contacted house power lines. 73 joe Avery wrote: clipped.... I mention this because amateur radio nearly always involves outside antennas in urban areas close to utility power wiring on poles. The possibility of fatal or terrible electric shock isn't confined to some radio-electronic box interior...it exists out in the open, in plain sight. Keep it in mind to avoid frying that mind. Len Anderson retired (and still living) electronic engineer person |
#174
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hi,
A gfci monitors for a current imbalance between the Hot and Neutral conductors. A ground connection is not necessary. Per NEC 210-7 http://www.leviton.com/sections/techsupp/faq.htm#2 wire gfi Regards. "Gary S." wrote: On Fri, 08 Aug 2003 17:01:16 -0400, Alex wrote: GFCI? Ground Fault Circuit Interruptor. It detects a sudden rise in current to ground and shuts the circuit off in a fraction of a second. Fuses protect the circuit, GFCI protects people. The present US Electrical Code requires them in areas where water is nearby, including bathrooms, kitchens, garages, and outdoors. You are encouraged to use them in other places where there is danger of zapping yourself. They are not a guarantee, but they boost the odds in your favor. |
#175
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hi,
A gfci monitors for a current imbalance between the Hot and Neutral conductors. A ground connection is not necessary. Per NEC 210-7 http://www.leviton.com/sections/techsupp/faq.htm#2 wire gfi Regards. "Gary S." wrote: On Fri, 08 Aug 2003 17:01:16 -0400, Alex wrote: GFCI? Ground Fault Circuit Interruptor. It detects a sudden rise in current to ground and shuts the circuit off in a fraction of a second. Fuses protect the circuit, GFCI protects people. The present US Electrical Code requires them in areas where water is nearby, including bathrooms, kitchens, garages, and outdoors. You are encouraged to use them in other places where there is danger of zapping yourself. They are not a guarantee, but they boost the odds in your favor. |
#176
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In article , Paul Burridge
writes: On 09 Aug 2003 19:46:02 GMT, (Avery Fineman) wrote: If the source has over 30 Volts and can supply over 30 milliamperes through the cardiac region, you will go into cardiac fibrilation. Sorry, Len, but I can't see it. I routinely check for HV on the anodes of certain smallish valves with bare fingers and can't even begin to feel anything under about 80 volts (at very much more current capability than 30mA) at the low end. However, I read somewhere that some guy died from just a 12V 'shock' - must have been a world record.. :-( I'm not concerned with what YOU do personally, nor will I set any "standards" for all humans based on what one human can or can't do or feel. I got the "30-30" phrase while working at Birtcher Instruments, a semiconductor test instrument maker and a division of Birtcher Medical that made several different medical electronic instruments (EKG, RF knife/cautery, defibrilators,etc.). Someone at Birtcher Medical told me about it. I was Chief Engineer at Birtcher Instruments in Monterey Park, California, a suburb of Los Angeles (not the upstate Monterey, CA, where some FedEx deliveries went, hi). I don't think that my employer at the time would give me false information. The City of Los Angeles building and safety codes don't require inspection of 24 VAC wiring in residences and that sort of wiring is common here for furnace and HVAC controls, doorbells, etc. That AC voltage is never considered "high voltage." That is probably true of the USA National Electrical Code although I haven't read one recently (I've only read the coding in the Numeric Electromagnetic Code recently, quite different from the other "NEC"). I really don't know the medical-biological low threashold for direct cardiac stimulation through an opening in the chest cavity. I don't care to know. I care to know NOT to futz around with my or anyone else's body with anything above the "30-30" limits. If YOU want to experiment with your own body, feel free. Then you transport yourself to that other "reality." When you get there, ask someone there to shock themselves into this reality and tell us all what it is like "over there." I live in THIS reality where survival depends on not treating electricity cavalierly like it was words in a newsgroup. Happy zapping. Len Anderson retired (from regular hours) electronic engineer person |
#177
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In article , Paul Burridge
writes: On 09 Aug 2003 19:46:02 GMT, (Avery Fineman) wrote: If the source has over 30 Volts and can supply over 30 milliamperes through the cardiac region, you will go into cardiac fibrilation. Sorry, Len, but I can't see it. I routinely check for HV on the anodes of certain smallish valves with bare fingers and can't even begin to feel anything under about 80 volts (at very much more current capability than 30mA) at the low end. However, I read somewhere that some guy died from just a 12V 'shock' - must have been a world record.. :-( I'm not concerned with what YOU do personally, nor will I set any "standards" for all humans based on what one human can or can't do or feel. I got the "30-30" phrase while working at Birtcher Instruments, a semiconductor test instrument maker and a division of Birtcher Medical that made several different medical electronic instruments (EKG, RF knife/cautery, defibrilators,etc.). Someone at Birtcher Medical told me about it. I was Chief Engineer at Birtcher Instruments in Monterey Park, California, a suburb of Los Angeles (not the upstate Monterey, CA, where some FedEx deliveries went, hi). I don't think that my employer at the time would give me false information. The City of Los Angeles building and safety codes don't require inspection of 24 VAC wiring in residences and that sort of wiring is common here for furnace and HVAC controls, doorbells, etc. That AC voltage is never considered "high voltage." That is probably true of the USA National Electrical Code although I haven't read one recently (I've only read the coding in the Numeric Electromagnetic Code recently, quite different from the other "NEC"). I really don't know the medical-biological low threashold for direct cardiac stimulation through an opening in the chest cavity. I don't care to know. I care to know NOT to futz around with my or anyone else's body with anything above the "30-30" limits. If YOU want to experiment with your own body, feel free. Then you transport yourself to that other "reality." When you get there, ask someone there to shock themselves into this reality and tell us all what it is like "over there." I live in THIS reality where survival depends on not treating electricity cavalierly like it was words in a newsgroup. Happy zapping. Len Anderson retired (from regular hours) electronic engineer person |
#178
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I had a NDE when I congratulated a young lady on her pregnancy, and it
turned out she wasn't pregnant. Near-fatal shock, it was, too. Roy Lewallen, W7EL |
#179
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I had a NDE when I congratulated a young lady on her pregnancy, and it
turned out she wasn't pregnant. Near-fatal shock, it was, too. Roy Lewallen, W7EL |
#180
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Paul Burridge wrote:
On Fri, 08 Aug 2003 21:36:08 GMT, Gary S. Idontwantspam@net wrote: On Fri, 08 Aug 2003 17:01:16 -0400, Alex wrote: GFCI? Ground Fault Circuit Interruptor. How splendid! We call them Residual Current Circuit Breakers in England. Typically they trip out at just over the amount of current required to kill someone. Keeps the bills down that way. In *this* universe, anyway. They're Earth Leakage Detectors in Australia. ;-) Rob |
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