In what scenario does the Code allow omitting the smaller of two dissimilar loads in calculating total load?

The scenario in which the Code allows omitting the smaller of two dissimilar loads in calculating the total load is when it is unlikely that both loads will be in use at the same time. This is based on the principle of diversity in electrical systems, which recognizes that not all loads will be simultaneously active at their maximum capacity. By allowing the omission of the smaller load, the overall load calculation can be more efficient and representative of expected usage, leading to potential cost savings and more accurate system design. This approach helps in preventing the oversizing of electrical equipment and ensures that the electrical installation can handle the actual load demand more effectively.

Considering the other options, they do not align with the principles set forth in the Code for calculating loads. For example, equal size loads do not present a distinct situation where one can be omitted, as they would equally contribute to the total load. Temporary installations are also treated differently under Code; their load is often considered necessary in the calculations regardless of their temporary nature. Lastly, the warranty status of the loads does not influence the load calculation methods provided by the Code.