Thanks for all the replies........
Jon, it is a huge harmonic problem, That's why I am into testing the whole plant.
I just didn't understand the whole 150C rise fully, so I thought I'd ask.
I kinda knew the 220c insulation class was the max. temp the insulation should see before it broke down, but I was weary of the the 150c vs the 300f I was reading.
I am sure I will have alot more questions soon about THD and it's limits, so if you got some time, I'd appreciate some answers.
Thanks again fellas......
Dnk.........