What condition must be met to use the actual maximum demand for determining an existing load?

Using the actual maximum demand for determining an existing load is a practice grounded in the need for accurate assessments of electrical requirements. This practice can be applied broadly, hence the choice that encompasses the various conditions under which it is applicable is appropriate.

To utilize actual maximum demand effectively, it may be necessary in multiple scenarios, including when detailed analysis is performed to ascertain actual usage patterns, particularly in commercial buildings where load characteristics can vary widely. Additionally, this approach is also relevant in cases where maximum equipment ratings are not available, as it allows for a more direct assessment of the electrical load based on real usage rather than just theoretical ratings.

By employing actual maximum demand, electrical contractors can ensure that the systems they design are adequately sized to handle the peak loads which will improve safety and efficiency in electrical installations. Thus, recognizing all these scenarios underscores the importance of using actual maximum demand as a substitute when other information may not be accessible or sufficient.