Underwurlde
Always look on the bright side of life..
Any thing that has any amount of conductivity and and has length will have INDUCED across it a DIFFERENTIAL voltage if in the presence of an alternating electromagnetic field such as mains wiring and mobile phones. These devices are simply transmitting very tiny amounts of energy in the EM spectrum. You, me & everybody else on the planet (unless they are in a farady cage) is in the presence of these energies.
The presence of mains devices such as lights, pumps etc will radiate electromagnetic waves and the presence of any nearby conductors (e.g. the body of water in a fish tank) will act as an amplifer to this just like any ariel will - the result is a differential voltage across the length of the ariel. The energies involved are tiny as are the resulting differential voltages - of the order of tens of thousandths of volts. The result of all this will be the tinest rise in temperature in the conducting body and as stated a differential voltage resulting in a tiny current flow.
There will be as much of this voltage from your head to your toes as you sit there reading this boring post. This is not to be confused with static build up of electricity which depends on a conductor (your body) and an insulator (your shoes) the combo results in a capacitor that can be charged up to >30,000Volts. But again the energies are tiny - yes you get a tiny little shock off your car or TV but never enough to kill you.
So I am asking myself why that guy went to the trouble he did (and why on earth - pardon the pun - that tungsten is used??) - It's utterly meaningless to me and seems to have unnecessarily worried alot of people - the voltages are neglidgable - in fact just picking up a volt meter or an ozzy scope probe with my fingers would give the same result - am I worried. Hell no. Should you be worried about 'stray voltages' - hell no.
Andy
Oh, and before I go, to answer your question '...and how do I get rid of it (re: stray voltages) - you'd put the entire body of water (NOT the tank as this would include the pump and NOT somehow including the heater) in a faraday cage, but again an utterly pointless exercise!
The presence of mains devices such as lights, pumps etc will radiate electromagnetic waves and the presence of any nearby conductors (e.g. the body of water in a fish tank) will act as an amplifer to this just like any ariel will - the result is a differential voltage across the length of the ariel. The energies involved are tiny as are the resulting differential voltages - of the order of tens of thousandths of volts. The result of all this will be the tinest rise in temperature in the conducting body and as stated a differential voltage resulting in a tiny current flow.
There will be as much of this voltage from your head to your toes as you sit there reading this boring post. This is not to be confused with static build up of electricity which depends on a conductor (your body) and an insulator (your shoes) the combo results in a capacitor that can be charged up to >30,000Volts. But again the energies are tiny - yes you get a tiny little shock off your car or TV but never enough to kill you.
So I am asking myself why that guy went to the trouble he did (and why on earth - pardon the pun - that tungsten is used??) - It's utterly meaningless to me and seems to have unnecessarily worried alot of people - the voltages are neglidgable - in fact just picking up a volt meter or an ozzy scope probe with my fingers would give the same result - am I worried. Hell no. Should you be worried about 'stray voltages' - hell no.
Andy
Oh, and before I go, to answer your question '...and how do I get rid of it (re: stray voltages) - you'd put the entire body of water (NOT the tank as this would include the pump and NOT somehow including the heater) in a faraday cage, but again an utterly pointless exercise!
