Lights turning off and flickering

[jlelectric]

I recentley installed 6, 2x4 flourecent light fixtures. I put them on a 20 amp cbr. The cbr is in on a 120/240 three phase panel. The panel is being fed from 3 seperate transformers (one for each Phase) and is boosting each phase from 120 to 135 volts. I know I can go over or under 10% of 120, but I exceedd 120. The panel that is feeding the three seperate transformers is full. So my only option was the panel that is being fed by the transformers. Would this setup cause the lights to flicker and turn off and on ? Could this be caused by thermal overload? What would be the solution?

 

[charlie]

I don't know if an over-voltage would cause that kind of problem with today's electronic ballasts but I am wondering why the voltage is being stepped up to 135 volts per phase? :-?

 

[JohnJ0906]

What is the actual voltage measured at the fixtures? 135 is 12.5% over nominal - too high IMO.

Why is the voltage being boosted so high?
Is the panel actually a 240/120 3 ph high leg, or a 208/120 wye?

 

[ptonsparky]

I am going to take a WAG and suggest that someone has used buck boost transfomers to raise the POCO 120/208 to 240v for specific equipment. You may not even have a neutral in the second panel. Are the other loads all three phase?

Check the voltage in the original panel & figure out a way to come off it. Subpanel or whatever.

 

[JohnJ0906]

I am going to take a WAG and suggest that someone has used buck boost transfomers to raise the POCO 120/208 to 240v for specific equipment. You may not even have a neutral in the second panel. Are the other loads all three phase?

Check the voltage in the original panel & figure out a way to come off it. Subpanel or whatever.

208 x 112.5 % = 234 volts. You may have hit the nail on the head with that one.