On Apr 24, 2005, at 8:21 AM, TexasRF@aol.com wrote:
> Much more can be said about the voltage rating of these power
> resistors. The
> failure mode resulting from over voltage operation is an open turn
> (and there
> are a bunch of turns, increasing the probability that one will open).
>
> Why this happens is unknown to me
With finer Ni-Cr wire, more turns, and more V, perhaps a turn to turn
arc burns the wire open?
> but I have seen it happen in my own ?
> equipment frequently enough that I will not use them any longer. On
> the other hand,
> many lower powered Metal Oxide type resistors in series have proven to
> be
> highly reliable; just a bit more work to install.
Indeed, Gerald. I do not trust higher-value WW resistors at their
published V-rating.
>
> ...
Rich Measures, 805.386.3734, AG6K, www.somis.org
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