Thanks for the reply Winnie.
You have raised some good questions. Which will lead me to ask more questions, since I know very little about harmonics on neutrals (other than I have read about it occurring).
1. I don't know whether the contractor measured the neutral load, can a normal clamp tester measure the harmonic current? For example a Fluke true RMS eg a model 33 or 35.
2. THD ? I assume is total harmonic distortion, do fittings have this marked on them?
3. I always thought that non linear loads such as switch mode power supplies on computers caused harmonics, can normal ballasts and capacitors cause harmonics as well?
Triplen Harmonics is definately not a term I had heard before, though a quick search on Google showed it is a common term. Are there sites which explain harmonics, triplen etc.
[This message has been edited by Dapo (edited 03-12-2005).]
