True or False: Harmonic distortion of AC output waveform from some inverters may interfere with proper GFCI operation.

The statement is true because harmonic distortion in the AC output waveform produced by certain inverters can indeed interfere with the proper operation of Ground Fault Circuit Interrupters (GFCIs). GFCIs are designed to detect imbalances between the incoming and outgoing current on an electrical circuit, which is crucial for providing protection against electrical shock.

When an inverter generates a waveform that contains significant harmonics, it may create what is known as a "false positive," where the GFCI senses an imbalance that is not actually a ground fault, leading to nuisance tripping. This occurs because the harmonics can confuse the device’s ability to accurately monitor the current flowing through the circuit. In essence, the presence of harmonic distortion can mask the actual current flow, making it appear as though there is a fault when there is none.

This interference is particularly notable with certain types of inverters, especially older or lower-quality models, which produce more distorted waveforms. As a result, understanding the impact of harmonic distortion is important for ensuring the reliable operation of GFCIs in systems that utilize inverters.