Re: [TCML] A Safe Tesla Coil - was: Tesladownunder update, briefcase coil, lots of sparks etc

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

I am also curious to know how exactly Transtrom got killed!?
I recall reading paper somewhere that it was solely due to  the connection of a 5 ft arc from his arm to the grouded stage framework.
Not mention of any arcing to the primary coil!
If true that means only one thing:big tesla coil arcs have potential to electrocute.
I really believe that.
3" spark from my body as TC top load  to a grouded pipe caused jolts in my hand.
Input power level below 50 W!
So,what is a safe Tesla coil power level?
Safe electrical power level in general?
50 V (50/60 Hz) and 50 mA are prooven to be life threatening values.
That's P=50V * 0.05A = 2.5 watts only.
Of course,tesla coils are less dangerous but good to know how low power,if everything goes wrong,is enough anyway.

Dex   

 

 






> Firstly, mains earth is the RF earth and goes to all the metal in the 
> briefcase which is the centrepoise. Secondly, spark length is such 
> that it is just not going to connect through the PVC pipe surround 
> separating the primary and secondary. The primary is fully enclosed.
> Child use means the child holding a small neon tube that is earthed 
> and drawing sparks. It is hard to imagine a circuit path that will be 
> a problem in this situation.
> I have always been a little skeptical about the situation you describe 
> anyway. Simultaneous sparks from primary to seconday plus toroid to 
> subject seem a bit far fetched. The circuit path for a mains = RF 
> earth would be very largely in favour of flow through the base of the 
> secondary rather than through the subject.
> Do you (or anyone) have reasonable evidence that this has increased 
> secondary current and if so why aren't we exploiting this all the time 
> to increase our TC sparks?  I am aware the Henry Transtrom was said to 
> have been killed in this way but I would have thought it was just a 
> high power coil that was the problem.
>
> Cheers
> Peter
> www.tesladownunder.com
>
>
> ----- Original Message ----- From: "Derek" 
> <tesla@xxxxxxxxxxxxxxxxxxxxxxxx>
>
>
>> Peter,
>> ..... I am interested as to how you have made this coil safe "for 
>> supervised children to use". I realise that the power levels and 
>> performance mean that the risk of electrocution directly are very 
>> small, but to my mind the most dangerous aspect of you coil is the 
>> possibility of a primary to secondary arc whilst a "tasting" was in 
>> progress. In this case there is a very real danger of connecting the 
>> 6Kv@30mA output from the NST via the secondary and arc channel to the 
>> "taster".
>>
>> Have you designed the coil in a way to limit or prevent this 
>> possibility ?
>>
>>    Derek
>
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