What is the primary consideration when calculating the demand for large motor loads?

When calculating the demand for large motor loads, the primary consideration is the starting currents and running currents. This is because large motors have a significant inrush current when they start, which can be several times greater than their normal operating current. This high starting current must be accounted for in demand calculations to ensure that the electrical system can handle these temporary increases without causing voltage drops or tripping breakers.

Additionally, while the running currents reflect the continuous load during operation, the starting currents are crucial for determining the overall impact on the electrical supply, as they can affect the sizing of feeders and protection devices. Properly considering both starting and running currents ensures that the motor will operate reliably and safely within the electrical system's capacity, preventing issues such as overheating or components being inadequately rated for the load they must handle.