...I have a job in progress,...it's an office space, and they have 2'x4' troffer layins all throughout the offices..the voltage is 277v., and the problem is that it seems that one by one, the ballasts are dying out..they were all installed about 5 yrs ago,and they're on 6 days/week,10-12 hrs a day.I've been told that these ballasts have a "life" of around 5 yrs..and it is common that they will all die out around the same time period...The company wants a bid from me to re-ballast and re-bulb all of the lights in the space...Is this a common occurrance or could there be a spike in the line thats causing this..?? I dissected a dead ballast and found that the small glass fuse was blown..it is on a pc board,so it would be a pain in the drain to replace just the fuse...What do I do..?? I've already replaced 8 of the 90+ ballasts as they wink out..Anyone ever hear of this???
AR
