How long must a load operate to be classified as ‘Continuous’?

To classify a load as ‘Continuous,’ it must operate for at least 30 minutes. This standard is crucial since continuous loads are those that are expected to run for extended periods, and proper sizing of electrical systems must account for the continuous nature of such loads. This duration plays an important role in ensuring that equipment can handle the sustained electrical demand without overheating or failing.

Potential confusion may arise from the other options, which suggest much shorter operating periods. A short burst of time, only a few minutes, or even a longer duration like 3 hours, do not meet the established definition of continuous operation. Therefore, recognizing the correct threshold of 30 minutes is vital for correct electrical load calculations and ensuring reliable system design.