On Wed, 2010-04-21 at 11:42 -0700, Roger Parsons wrote:
> I have access to a 325' tower for my remote station, and like to assist the
> tower owner where possible.
> The tower lighting is controlled by a light sensistive switch working a relay
> which actually controls the lights. The relay controller appears to be home
> made and did have a large open frame relay in it - until the contacts
> completely disappeared! (The actual load from the lights is about 1200w on
> each of two phases.) I replaced the relay with a 30A contactor which I
> thought was overkill and it was fine for several years, but that is now
> getting unreliable. Clearly there is a pretty heavy switch on surge with
> incandescent lamps, but this must be true at all tower sites.
> What do the professionals do? (I suspect the answer to that is spend several
> thousand dollars with Cutler-Hammer.....)
> 73 Roger
You need a snubber. http://en.wikipedia.org/wiki/Snubber
Kipton Moravec AE5IB .- . ..... .. -...
"Always do right; this will gratify some people and astonish the rest."
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