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Fw: What wattage resistors for NST protection?



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> From: Jim Lux <jimlux@jpl.nasa.gov>
> To: Tesla List <tesla@pupman.com>
> Subject: Re: What wattage resistors for NST protection?
> Date: Thursday, February 17, 2000 4:10 AM
> 
> The vitreous wire wound kind also have a moderately spectactular failure
> mode.  A small nick or chip in the wire winding causes a spot open. It
> arcs, melting the wire back. An ever larger gap opens up as the arc
spirals
> back up the resistor.
> 
> I have only seen this with a big capacitor discharging into the resistor,
> but a high current power supply (like a pole transformer) could probably
do
> the same thing.
> 
> ----------
> > From: Tesla List <tesla@pupman.com>
> > To: tesla@pupman.com
> > Subject: Re: What wattage resistors for NST protection?
> > Date: Wednesday, February 16, 2000 7:11 PM
> > 
> > Original Poster: "Mike Harrison" <wwl@netcomuk.co.uk> 
> > 
> > A quick warning about grossly overrunning resistors - I have seen the
> > end seals of one of the (usually) gold-coloured aluminium clad power
> > resistors disintegrate with considerable speed and an alarming BANG
> > when severely overstressed. ceramic types could also possibly shatter.
> > be careful!
> > 
> >