Re (2): UPS with earth leakage device.
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From: Curt on 10 Jan 2010 10:32 On 2010-01-09, ArameFarpado <a-farpado.spam(a)netcabo.pt> wrote: > this fenomenon have been seen several times in the country; cows, dunkeys, > horses, etc. died in a instant when thunder bolts fall near them. Is this an argument for bipedalism? > the all point was about earth's electrical potential, witch is not the same > everywhere. I think we have more potential here in Europe, but that's just me.
From: jellybean stonerfish on 10 Jan 2010 13:24 On Sat, 09 Jan 2010 22:58:08 +0000, ArameFarpado wrote: > the all point was about earth's electrical potential, witch is not the > same everywhere. > > I agree that witches are not the same everywhere, but what does that have to do with electrical potential.
From: Bit Twister on 10 Jan 2010 17:23 On Sun, 10 Jan 2010 12:26:09 +0000, ArameFarpado wrote: >> >> Here R1 would be the wire or earth. R2 would the man,bird,... The + is >> each foot's connection to earth/wire. >> >> R2 >> .--\/\/\/\--. >> | | >> | R1 | >> ------+--\/\/\/\--+-------- >> >> >> High values of current passing through the conductor R1 (wire, earth) >> create a difference in potential (voltage) due to the resistance of >> the conductor R1. >> >> When the potential becomes high enough across R1 enough current will >> flow up their feet/legs and through R2 (their body). Once the current >> gets high enough in R2's brain/heart death occurs. > > for that to work the way you say, the conductor must be highly damage right > under the bird/man feet. Absolutely not. Under normal conditions no conductor is resistance free. The operational factor here is the very high abnormal current flow between points of contact creating the voltage.
From: ArameFarpado on 10 Jan 2010 17:45 Em Domingo 10 Janeiro 2010 22:23, Bit Twister escreveu: > On Sun, 10 Jan 2010 12:26:09 +0000, ArameFarpado wrote: >>> >>> Here R1 would be the wire or earth. R2 would the man,bird,... The + is >>> each foot's connection to earth/wire. >>> >>> R2 >>> .--\/\/\/\--. >>> | | >>> | R1 | >>> ------+--\/\/\/\--+-------- >>> >>> >>> High values of current passing through the conductor R1 (wire, earth) >>> create a difference in potential (voltage) due to the resistance of >>> the conductor R1. >>> >>> When the potential becomes high enough across R1 enough current will >>> flow up their feet/legs and through R2 (their body). Once the current >>> gets high enough in R2's brain/heart death occurs. >> >> for that to work the way you say, the conductor must be highly damage >> right under the bird/man feet. > > Absolutely not. Under normal conditions no conductor is resistance free. > > The operational factor here is the very high abnormal current flow > between points of contact creating the voltage. even high tension cables have circuit breakers that shuts down lines in short circuit
From: Bit Twister on 10 Jan 2010 17:55
On Sun, 10 Jan 2010 22:45:23 +0000, ArameFarpado wrote: > even high tension cables have circuit breakers that shuts down lines in > short circuit Did not say they didn't. Of course they are slow blow breakers giving time for the fatal shock to kill the birds. |