Re: [TCML] Where to mount the HV Transformer? Under the coil or otherwise ?

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

There's no real reason to use HV cable for NST coils. If you're doing it for safety, then you need to take extra precautions to avoid damaging the insulation while setting it up and breaking it down. You also don't want to use coax, as it was never designed to be safe at 15 kV.

If you don't plan on touching it, then you can use regular 600 volt insulation (or bare), and either pull it through tygon tubing, through PVC pipe, or provide supports to keep it off the ground. I ran my pig powered coil for years with wire pulled through tygon tubing and never had any problems. If you use bare or 600 volt insulated wires, just be sure to leave enough spacing to prevent flashovers.

Adam

--- On Wed, 6/25/08, Jeremy Scott <supertux1@xxxxxxxxx> wrote:

> From: Jeremy Scott <supertux1@xxxxxxxxx>
> Subject: Re: [TCML] Where to mount the HV Transformer? Under the coil or otherwise ?
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Wednesday, June 25, 2008, 12:36 AM
> I read the coax idea off of this site:
> 
> http://www.pupman.com/safety.htm 
> 
> Somewhere in there it says this:
> 
> "The transmission line between your high voltage
> transformer and your tesla coil is another potential source
> of electrocution. This should be constructed using neon sign
> wiring (rated to 40 kV) or thick coaxial cable like RG-8A/U
> or RG-11A/U. If using coaxial cable, use the inner
> conductor for the high voltage, and strip back the outer
> braid about 6-12 inches from each end. Connect one end of
> the braid to your RF ground. Leave the other end
> unconnected so it does not form a current loop. Some
> coilers also place their high voltage cables inside a
> plastic conduit, which is laid on the floor. This also
> protects the cable somewhat from strikes."
> 
> I was just wondering if anyone has any experience doing it
> that way. 
> This is basically the 50 and 75 ohm impedance cable that
> you can get anywhere. They have a thick PTFE insulation
> between the core conductor and the braid which I think
> would be ideal for isolation. The braid being a nice
> additional safety feature.
> 
> On the other hand... just don't know.
> 
> It would be interesting to see just how much voltage it
> takes to pop one of those cables. 
> 
> 



      
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