Re: [TCML] shielding and emi/emc

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

Mary shouldn't have any problems regarding that matter than.
If Wysock was allowed to install a caged 13 kVA coil for
public displays ,she must be allowed to do the same 
with 3 kVA twin coil system.Case closed!

Dex

 
--- jimlux@xxxxxxxxxxxxx wrote:

From: jimlux <jimlux@xxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: [TCML] shielding and emi/emc
Date: Tue, 08 Dec 2009 19:59:55 -0800

Dex Dexter wrote:
> Hey,my point is if it can be done good enough for 
> SGTC capable of developing 15 feet long
> discharges, it can be done for less powerfull coils
> creating up to 5 feet sparks too.

Uhh.. I'm not aware of anyone shielding ANY tesla coil of any size to 
meet whatever limits.. Folks build safety cages for sparks and shocks, 
but I doubt there's any that have done a rigorous EMI/EMC shielding job. 
  You can meet the ANSI standard for RF exposure without a cage by just 
working the distance issues, particularly for magnetic nearfields, which 
are probably the exposure issue of most concern.

Folks have built display coils that are "acceptable" in whatever fuzzy 
requirement or environment there is, but that's not to say that the 
cages are effective in any sort of numerical sense.


> Notice that in the article author uses words
> "OSHA and FCC guidelines" ,AFAIK they are very restriktive,
> and this probably means success in significant EMI reduction.

Not really. OSHA only cares about sparks and shocks, and as pointed out 
above, EM exposure probably isn't a problem. FCC wise.. Tesla coils are 
in a funny space. They're "unintentional radiators" and probably meet 
Part 15 without cages. There's some talk about FCC regulatory issues on 
the list back 5 or 6 years. Mostly it's "don't ask don't get told no". 
FCC regulations don't really care much about interference that stays 
within the limits of your property line, so if you blast all your own 
radios in your building, that's your problem, not the FCCs.  If you SELL 
a tesla coil, that's a different matter, but they probably (at least for 
spark gap coils) don't fall in any of the categories of interest for 
Part 15 (e.g. they're not digital circuits clocked at higher than 9kHz, etc)


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