Re: [TCML] HV wire ?

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

I don't know of a source, but it's used unshielded in switchgear all the time:

http://www.classictesla.com/hot-streamer/adam/garage/15kv_switchgear_cable.jpg

Adam

--- On Mon, 6/14/10, Steve Ward <steve.ward@xxxxxxxxx> wrote:

> From: Steve Ward <steve.ward@xxxxxxxxx>
> Subject: Re: [TCML] HV wire ?
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Monday, June 14, 2010, 12:53 PM
> Thats gonna be a rare item i think,
> aside from stuff made for power
> distribution which i believe normally has a shield. 
> Those types of cable
> are a real pain to work with.  Also, beware of "DC"
> cable voltage ratings,
> its many many times easier to make HV DC cable, but when
> you apply AC to it,
> the corona-free voltage is usually much less (maybe 1/4 of
> the DC rating).
> 
> With all the HV design work i do (and see) at fermilab, we
> typically avoid
> HV wire, its a false sense of security and often times its
> best to just go
> with bare conductors so that corona does not eat away the
> insulation over
> many years.  For tesla coil use, welding cable with
> some extra vinyl tubing
> sleeved over it works pretty darn good, especially when it
> isnt subject to
> HV for years and years and is routinely inspected.
> 
> Im also a bit suspect over the request for 0 awg. 
> Given the skin effect,
> how much current do you think is getting more than 1/16th
> of an inch deep
> into that big cable?  The rest of the copper is just a
> heat capacitor.  A
> bunch of smaller wires in parallel is better if you are
> really going for
> performance for both cooling and for AC resistance.  I
> admittedly use 2awg
> wire a lot for convenience, it gets pretty darn hot... i
> dont think going to
> 0 awg would ever fix that because its nearly all AC
> resistance and the
> surface area isnt going up tremendously.
> 
> Steve
> 
> 
> On Mon, Jun 14, 2010 at 12:34 PM, Ian Charnas <ian.charnas@xxxxxxxxx>
> wrote:
> 
> > Hi we're looking for 20 feet of 0 AWG rated to 15kv,
> does anyone have any
> > they would sell or know of a good supplier?
> >
> > Ian Charnas
> > http://teslaorchestra.com
> >
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