skipr,
I was reading this thread and some of you stated that there is no real edvidence of problems with harmonics. And it's just a economic theory to sell products and service. I can tell you right now that it is a very real problem, that has infected an entire high school district I work for.
Show me the documented evidence...by a qualified electrical engineer. Such problems are very rare except in the publications authored by those with an economic interest in solving the problem.
The electrical system has caused major problems on equiptment. And I personally discovered the building steel has been acting as the neutral
That has nothing to do with harmonics...there is a design or installation flaw on the system.
Some have even gone further and run a extra green wire (w/yellow stripe) for isolated ground.
What does that accomplish?
Don