Zifkwong said:I would like to determine how far away from a piece of carbon steel I have to be with approximately 40,000 Amps.
If alternating current field Hysteresis is heating nearby tools, I wonder what it does to your red blood cells (iron), or the amalgam fillings in your mouth? Might make a good chemotherapy, or irradiation alternative for cancer or aids patients, or it might just cook you like a microwave, from the inside out.Zifkwong said:..if you have a pair of channel-locks in your pocket and approach the cables to take a current reading....you get a nice brand through you FR pants.
Strapping some current xfmrs (CT) around that cable may feed a seperately derived system, with these kind of magnetics fields, and dampen the cable field where covered by the CT.Zifkwong said:Does anyone know what acceptable B and H field strengths are to avoid heating of carbon steel to high temperatures?
Zifkwong said:Does anyone know what acceptable B and H field strengths are to avoid heating of carbon steel to high temperatures?
One of the things that struck me when plowing through a lot of the NIHS EMF references and abstracts was, unlike many forms of pollution, denser, stronger EMF does not correlate with greater physiological effects. The studies, in general, showed that there are bands, or windows (if you will), of effect at certain combinations of electric field, magnetic field and frequency, and that, strikingly, the physiological effects at low field densities equaled or exceeded the effects at other higher windows of field density, while whole portions of EMF densities, as yet, produce no observed physiological effect.ramsy said:If alternating current field Hysteresis is heating nearby tools, I wonder what it does to your red blood cells (iron), or the amalgam fillings in your mouth? Might make a good chemotherapy, or irradiation alternative for cancer or aids patients, or it might just cook you like a microwave, from the inside out.
If people work on any piece of carbon steal near that 40,000A open bus, doesn't NFPA 70E limit personell proximity to energized equipment, without PPE, way beyond the point tools would encounter inductive heating?Zifkwong said:There are no raceways nearby. It is open bus..
TABLE S-5 - APPROACH DISTANCES FOR QUALIFIED
EMPLOYEES - ALTERNATING CURRENT
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Voltage range (phase to phase) | Minimum approach distance
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300V and less ....................| Avoid Contact
Over 300V, not over 750V .........| 1 ft. 0 in. (30.5 cm).
Over 750V, not over 2kV ..........| 1 ft. 6 in. (46 cm).
Over 2kV, not over 15kV ..........| 2 ft. 0 in. (61 cm).
Over 15kV, not over 37kV .........| 3 ft. 0 in. (91 cm).
Over 37kV, not over 87.5kV .......| 3 ft. 6 in. (107 cm).
Over 87.5kV, not over 121kV ......| 4 ft. 0 in. (122 cm).
Over 121kV, not over 140kV .......| 4 ft. 6 in. (137 cm).
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