BigJohn;
And as far as temperature, all these ballasts are toasty.
Ahh, that sounds like the problem!
Type P Ballasts have thermal cutouts, which will turn off the incoming AC Power if temperature is excessive.
I know they're too hot to handle, but because they require 90C wire, I'd expect them to be at least 75C+. Even if the problem is thermal, I don't understand why it'd only be these two locations.
Check for wiring faults in the Lamp Circuitry. Things like Lamp Leads faulted to the metallic fixture, pinched Leads, shorted Lamp Holders, etc., and also use of incorrect Lamps / Ballast.
Lastly, check for methods for heat to be entrapped within the fixture - or around the fixture, and also check for methods for heat to become concentrated in the fixtures' area - like an HVAC Supply Diffuser, Infrared Heater(s) aimed at or near the fixture, Incandescent or Quartz-Halogen Lamps operated near the fixture, and etc.
Scott35
