On Monday 12 Apr 2004 11:21 am, Aron Smith wrote: > On Monday 12 April 2004 01:47 am, John Wilson wrote: > > On April 11, 2004 07:39 pm, Marc wrote: > > . > > > > In the vast majority of cases two grounds will simply, as you say, > > make things worse. > > Can't see that electricity is going to follow Ohms law and go the > path of least resistance so 2 grounds would be (r1+r2)/(r1*r2) =Rt
There are two things wrong with this. Firstly, ground is not a perfect conductor. Many cows die because their feet are different distances from a lightning strike, creating a voltage of several thousand volts across the length of the cow. There will be a similar voltage between your two earth rods. Secondly, lightning is high frequency and unimaginably high voltage. It behaves in strange ways that are still imperfectly understood. In addition it may create an earth loop, which is basically an antenna. (My HiFi used to pick up Radio Moscow until I removed one of the earths.) Your earth wiring could pick up an induced voltage from a nearby lightning strike and fry equipment that would otherwise be safe. -- Richard Urwin
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