There are (20) 400 watt MV High bay lights wired to a 30 amp 3-pole CB. There is a ground fault on the ckt. that is causing the CB to trip, shutting down all 20 fixtures.
Someone repaired it once, but the same thing happened again.
Although a neutral conductor was run to the 400-amp service MDP, it is just taped off and laying in the gutter. Voltage to ground is 277, so it must be a 480/277 wye service.
The problem is that since ther are 20, and not 21 lights(divisable by 3) the load must be imbalanced.
I think that the imbalance might be causing a higher voltage on some fixtures, causing the ballast to short. I'm thinking about simply adding another fixture, and replacing the existing fixtures with fixtures that have fuses.
Any thoughts?
Thanks.
[This message has been edited by Redsy (edited 02-19-2005).]
