A three-phase load requires a minimum of how many supply lines?

In a three-phase electrical system, a minimum of three supply lines is required to deliver power effectively. Each supply line represents one phase of the three-phase system, which means that they provide balanced loads and the necessary phase difference between them. The three-phase supply lines work together to deliver power more efficiently, allowing for a smoother operation of electrical equipment, such as motors, which often depend on three-phase power to function optimally.

If only one or two supply lines were used, it would not provide the three-phase power required for those loads, leading to insufficient power delivery and potential operational issues such as increased harmonic distortion or motor overheating. The fourth line, often referred to as a neutral, may be included in some configurations, but it is not a requirement for the basic three-phase supply itself. Therefore, three supply lines are essential for any three-phase load to ensure proper and efficient operation.