This three-stage computational method assists in determining the appropriate cable sizes for motor applications. It involves calculating the full-load current, applying correction factors based on ambient temperature and grouping of cables, and finally selecting a cable with an ampacity rating equal to or greater than the adjusted current value. For example, a motor with a full-load current of 10 amps, operating at an elevated temperature, might require a cable rated for 12 amps after applying the necessary correction factors.
Proper cable sizing is crucial for safe and reliable motor operation. Undersized cables can overheat, leading to insulation failure, short circuits, and potential fire hazards. This methodology, based on the work of Harold Parks, provides a standardized approach, promoting consistency and minimizing the risk of such incidents. Its widespread adoption reflects the importance of accurate cable selection in electrical system design.