I have discovered a mysterious ballast failure. There was a small hole in the ballast with burn marks on the light fixture. Surprisingly, the lens was undamaged and remained intact. The main air circuit breaker that feeds the panel powering the light in question tripped.
Please see attached...
I am wondering what the mathematical formula is to calculate the length of an electric arc length in air. I can't seem to find this formula anywhere on the web. Any suggestions??
