Zapped ,,, I have a pair of contactors. The 'control circuit" has the photocell, the timer, and the pontactor coils on it. Period. It also has its' own dedicated neutral.
I'm also losing ballasts ... nearly half of them ... $230 each, electronic HID ballasts only 3 years old. Now, these are spread over several circuits, and I agree that a loose neutral connection might cause voltage surges. Yet, even in those instances, the loads are really well balanced - again, mitigating the effect of a loose neutral. Overall, the sparky who did the place did a very good job.
Now, the pole lights are on their own photocell, and no contactor ... but a 25 amp rated photocell ought to be plenty for 800 watts of MH!
So, all I can do is wait and see what the datalogger shows - though I might take apart some of the switchgear, just to see if I can spot anything not 'right.'
