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Re: [TCML] EM fields safety standard available for free, now



I haven't tried to read the standard yet but wonder if it gives allowable exposure as a function of time. The effects of high magnetic fields at TC frequencies consist almost completely of local heating and are probably completely trivial with the lengths of time anyone would likely be exposed. Because of the conductivity of the body I'd think the effects of electric fields would be even less.

Ed


Jim Lux wrote:


Jim Lux wrote:

IEEE has made IEEE C95.1-2005, the EM fields safety standard, available for download for free:

http://standards.ieee.org/findstds/standard/C95.1-2005.html

Defines the Maximum Permissible Exposure (MPE) for electric and magnetic fields from 3kHz on up. And it defines the "Action Level" (which used to be called "uncontrolled exposure".. i.e. the casual viewing public.. MPE applies more to occupational exposure)

Based on a bunch of analysis I did a few years ago, for a TC, you're most likely to bust the limits with magnetic fields from the primary. The E fields are high, but the duty cycle is low, so the actual absorption is small.

Magnetic (H) fields are also harder to shield. Almost any sort of "cage" does a nice job containing the E fields, but you need a solid iron box to contain the H fields and running your coil inside a big iron box isn't going to be very showy..

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