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

[Jim Houx <pha3zme@xxxxxxxxx>]

Where is the part which mentions the dangers of frequencies below 100Hz?

:P

On Mon, Mar 5, 2012 at 6:27 PM, Ed Phillips <evp@xxxxxxxxxxx> wrote:

> 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<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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