cogreslab said:
To Hans:
Thanks for clearing up the issue of whether you live in the UK, but does that answer mean that you do not work for an overseas utility too, since your answer leaves that question unanswered?
I work in the medical industry. I do not now and never have worked for a power company. I have worked with medical electronics (to some degree still do), this is the reason I feel qualified to discuss these matters.
I am not trying to suppress knowledge of possible dangers around electromagnetic fields, in fact, being a potential victim like anybody else, I would like such dangers to be disclosed. I am, however, interested in the truth, and I am taking time to discuss this subject with you because I suspect that you are on a wrong track and one with considerable potential to spread needless fear and hysteria in the population.
You may say that this is none of my d*mn business, but ...well, this is a forum for skepticism; we are here to find the truth and disclose deception, wherever we find it.
To respond to the question you say I have not answered, namely:
"Now, for one question you have not answered: Do you or do you not claim that potential damages from electrical fields are caused by caused by the fields and running in the tissues of the body?"
Well, I can see I bungled up the typing rather bad there, sorry.
This is how I see it: there are a number of different life processes dependant on the use of electrons in some way or other, including electric fields. For example, the brain and the heart both use relatively weak electric fields to convey instructions to the body's cells, and there is evidence that exposure to external electric fields (say from high voltage powerlines but not exclusively from that kind of source) can cause bradycardia. (Asanova and Rakov 1966 was the earliest example I can think of there, but there were also studies published before that).
In the brain, which is largely composed of glial cells responsible for synthesising ATP, the effect is different in that the electric field depolarises their inner mitochondrial membranes thus lowering the amount of energy available in the brain, and having diffuse cognitive effects.
These are only two examples of the many differing effects I believe are going on, and though I take your point about the skin acting as insulator, it is not really able to prevent ELF entry in the same way it might be protective against microwaves (the longer the wave the more penetrative, hence the use of ELF for submarine communication).
I am still not sure if I have completely answered your question, because I cannot understand the sense of the last part, and wonder if you may have left some word out?
Yes, sorry. The word is "current"
...see below.
I won't be able to post more tonight but will come back for more tomorrow. Ding Ding; end of this round!
I think this requires a bit of clearing-up. First the term "electrical field":
You are using this word for two different pnenomenons and you are evidently confusing them.
1) Electrical field, as used in electromagnetic theory. This is the field that exists between two differently charged entities. The classical example is a capacitor, and indeed all systems generating an electric field can be treated as a capacitor. A capacitor consists of two conductors, or plates, with an insulating material between them. If the conductors have a different potential, an electric field will exist between them. If the potential between the conductors changes (like in AC) a charge is passed between them, in other words: The capacitor can pass an AC current.
Let us look at a pertinent practical example, a human body, and a power wire: The wire holds a potential (one that changes, assuming it is an AC wire), the human body is more or less at ground potential, or at least, let us assume for now that it is. The wire and the human form a capacitor, each being one plate. The air, plastic sleeving, clothes, upper skin, furniture, that happen to be between them is the insulating material, the dielectricum. The field extends between the surfaces of the conductors, but it does not penetrate into either conductor. If an AC current is passed between the plates (in the present case there will be a small current passed), it will be converted to electrical current inside the plates; the electrical field cannot exist inside a conductor (faraday cage).
2) Electrical field, as in the electrical fields controlling the heart and other organs, and the field that certain types of fish use for sensory input, end even for a weapon. This is basically an electrical current running in a conductor, but because the conductor is not a wire but a three-dimensional conductive medium, current moves and is distributed in a fashion that resembles, but is far from equal to the electromagnetic type of field.
The two forms of "fields" are inextricably connected, but the exchange of energy between them is quite complicated, and it is important not to confuse them. I would advice the use of the term "current field" for the second type, for clarity.
When a human (or animal, of course) is subjected to an electromagnetic field (AC), two things happen:
The electical field component will pass a current capacitively through the body, to ground. It is a low current, and it will be distributed over large parts of the body. The electical field itself will not penetrate much below the skin because the conductivity of the body is much higher than that of the surrounding medium (air, etc.).
The magnetic field will pass through the body and will induce a current in the body (as a changing magnetic field will do in any conductor it passes). The size and the direction of the current will depend on a number of factors, but it will act in much the same way as the one caused by the electric field. The two currents may add or subtract, according to conditions.
As you can see, it does not appear that an electrical field can influence the body in any other way than causing cmall currents to flow in it. I see no reason to suppose that it should have any effect different from a magnetic field, thus I would assume that tests taking magnetic fields into account will also be valid for electric fields.
I hope this clears things up a bit.
Hans