RE: Potting compound suggestions

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>


The potting requirements for an NST aren't what they are for a 60 kV 
multiplier.  The typical NST sees no more than about 10 kV to ground at any 
point. In an NST the potting is for mechanical support (that wire is pretty 
darn fine), water proofing (they are "sign transformers", after all) and a 
bit of insulation (although I've seen a fair number of depotted NSTs work 
perfectly well in open air) as well as some thermal transfer.

Melted and solidified mineral oil (which is what petroleum jelly basically 
is) or asphalt (hey, basically the same thing again, just not nice and 
white) or wax (whether from petroleum (paraffin) or bees) would meet all 
the NST requirements, but not the 60 kV HV breakdown requirements.


At 01:15 PM 7/22/2003 -0600, you wrote:
>Original poster: "Lau, Gary by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><gary.lau-at-hp-dot-com>
>
>I've repotted my NST in melted Vaseline petroleum jelly and it's been fine 
>since then.  I think it would satisfy your requirements.
>
>Gary Lau
>MA, USA