: This is the industry benchmark that defines the limits for harmonic current and voltage distortion at the Point of Common Coupling (PCC). 3. Effects of Harmonics on Equipment
| Load Type | Dominant Harmonics | Typical THDi | |---------------------|-------------------------|--------------| | 6-pulse rectifier | 5th, 7th, 11th, 13th | 25–35% | | VFD (diode bridge) | 5th, 7th | 30–40% | | LED driver (low PF) | 3rd, 5th, 7th, 9th | 70–90% | | Arc furnace | Wideband, odd & even | Highly variable | : This is the industry benchmark that defines