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Why NST's are doomed...
I found some interesting commonly asked questions on the France
transformer company's page: http://franceformer-dot-com/html/home.html
Most interesting, they confirmed what has long been suggested, that the
terminal voltage of an NST in lighting applications is normally a much
lower voltage that the faceplate value, and that higher than normal
running voltages will stress the insulation, leading to breakdown. It's
a wonder that NST's work for us at all!
Q:What is overloading and what affect does it have on a transformers life?
A: Overloading, or the connecting of more tubing than recommended, produces
higher secondary voltages resulting in increased stress on the insulation
system. This stress can cause insulation failure and reduced transformer
life. Overloading can also cause tube flicker creating high voltage
peaks or spikes in the secondary coils, damaging the insulation system
and again, significantly reducing transformer life.
Gary Lau
Waltham, MA USA