We changed a number of T12 tubes yesterday- one of which inexplicably tripped breakers on 3 different circuits, some of which are on completely different panels. The only thing these circuits have in common are that all these panels are that they're fed from the same 100kVA transformer (208Y/120V).

What could possibly have caused this? Any of you seen something like this before? Only thing I can think of is harmonics from the ballast causing just enough harmonic surge in the transformer secondary to trip already overloaded circuits. Either that, or maybe the grounds are all messed up.