[0] Harmonic Voltage Distortion [1] Random equipment resets / crashes Clock problems Synchronising problem due to to multiple zero crossings [2] THD Spectrum Analysis (L-L) (L-N) (N-E) [4] Electronic Voltage Stabilisers (Waveform correction option) Active Harmonic Conditioners [3] 
High levels of non linear current Variable Drives System Resonance High Impedance