The third, fifth, and seventh harmonics are prominent low-order odd harmonics that frequently appear in industrial and commercial electrical power distribution networks due to the operation of three-phase rectifiers and variable frequency drives. The third harmonic operates at three times the fundamental frequency and is known for accumulating in neutral conductors. The fifth and seventh harmonics are negative and positive sequence harmonics respectively, which interact within three-phase systems to create counter-rotational magnetic fields inside electric motors, resulting in severe torque pulsations, mechanical vibration, and accelerated thermal aging. Engineers must account for these specific harmonic orders when designing facility power systems.