Just installed a lighting contactor for parking lot lights at 480 volts. I used a 277 volt coil using the line 1 voltage of 277 volts to send thru a photo-cell on the line side. When the photo-cell is activated it would pull in the contactor on the load side, turning the lights on. When testing this after completion by putting the box over the cell to similate darkness, the photo-cell was blown apart after the lights had switched off for approximately 20 - 30 seconds.
One side of the coil was connected to a common as well as the photo cell white wire being connected to the same common. Any ideas as to why it blew apart? Any suggestions for a remedy?
Thank you.
