mbrooke
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- United States
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- Technician
I disagree. Twisted conductors are always better with EMF then flat conductor side by side.
Utilities Transformer Ground Connection
- Thread starter Joseph P.
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I disagree. Twisted conductors are always better with EMF then flat conductor side by side.
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- Licensed Electrician
I know they are better, but they're not THAT much better.
kwired
Electron manager
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- NE Nebraska
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- EC
Having the conductors in close proximity still is much better then routing each conductor of a circuit away from each other - like was common with knob and tube wiring systems. Twisting them around each other is better yet.
mbrooke
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But still better over two side by side which is my point. I've heard of testing labs where specialized rules mandated EMF to be as low as possible and twisted conductors were implemented in meeting that.
Joseph P.
Member
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- Long Beach, NY USA
The magnetic fields were measured with a try-field meter. The only place any magnetic field showed up was near the wall behind the refrigerator. I have to pull out the ref. to put some shielding material behind it to absorb the magnetism. The other fields were measured with the multimeter doing the body voltage measurement. The field was reduced 75%. The rest will have to be corrected with shielding paint. Y-Shield. This does not work for magnetic fields, but does additionally cover RF.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
You have made the decision that it will be easier to shield the wall behind the refrigerator than to correct the the wiring error (probably within the wall) that is causing it?
Or is it coming from the refrigerator?
The body voltage test is not a good measure of the field you actually sense if the ground lead you test against does not represent the potential of the floor, walls and other objects surrounding you.
It is more expensive, but an actual E field sensor with probes is more representative of what affects your body.
The testing as you move towards the utility pole is indicative of an earth voltage gradient, likely the result of earth currents that should be flowing on metal conductors instead.
mobile
Or is it coming from the refrigerator?
The body voltage test is not a good measure of the field you actually sense if the ground lead you test against does not represent the potential of the floor, walls and other objects surrounding you.
It is more expensive, but an actual E field sensor with probes is more representative of what affects your body.
The testing as you move towards the utility pole is indicative of an earth voltage gradient, likely the result of earth currents that should be flowing on metal conductors instead.
mobile
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mbrooke
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- United States
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- Technician
Joseph P.
Member
- Location
- Long Beach, NY USA
Refrigerators tend to produce a magnetic field. There is material that you can purchase from Less EMF and other companies that can help block and absorb the magnetism. The panel and the ref. are usually a source for magnetism even when there are not wiring errors.
The body voltage reading works well to see what is influencing your body, which is really the concern with health issues. You are correct about the standing on the floor. If you are grounded with bare feet it will not give you an accurate reading. I test with rubber soled shoes on. I have looked at the Gigahertz meters that are non contact and have borrowed one before, but so far the body voltage test has been accurate enough. When you fix the source of the problem the voltage goes away quickly. You can even use it to trace wires in the wall if they are Romex.
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