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Only a strong supposition based on epidemiological and anecdotal elements.

When I see stuff like : there's no evidence of harmful effects to animals, as long as you keep feeding troughs and all other metallic elements grounded... yeah well... I would prefer to see evidence of thriving animal breeding installations under power lines, because all I know about is counter-examples.

Unfortunately, the places I usually go for a summary of the epidemiological literature turned up dry

That's interesting. So little study of something that is so important economically to such powerful actors as (generally) national-monopoly lines companies... Move along, there's nothing to see here...

It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II

by eurogreen on Fri Apr 15th, 2011 at 04:21:27 AM EST
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They came up dry on the particulate matter hypothesis, not on epidemiological studies of power lines, which, according to Quackwatch, show no effect.

I would prefer to see evidence of thriving animal breeding installations under power lines, because all I know about is counter-examples.

Anecdotes are all well and fine if you have some sort of plausible hypothesis worth testing. But if your hypothesis is that the electrical field from a power line has biological effects... well, let's take a 1 GW, 10 kV power line. That gives you a current of 100 A, which translates to a magnetic field of 10 microTesla at three meter, or 1 microTesla at 30 meter. That's between a half and one and a half orders of magnitude less than the Earth's magnetic field, and between one and two orders of magnitude below the German continuous exposure limit (yes, the Germans have a limit for magnetic field exposure). And, as noted upthread, 50 Hz doesn't resonate with any molecular or inter-molecular bonds.

Oh, and 1 GW lines are DC lines, which means the fields don't oscillate at 50 Hz. AC lines are at least an order of magnitude smaller.

So if I had a million € for an epidemiological study, an application to study the health effects of E/M fields from high-voltage lines would pass the payline unless it was a really thin field.

- Jake

Friends come and go. Enemies accumulate.

by JakeS (JangoSierra 'at' gmail 'dot' com) on Fri Apr 15th, 2011 at 01:47:55 PM EST
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