What is the proper service demand adjustment for the first three dryers in an apartment complex?

The proper service demand adjustment for the first three dryers in an apartment complex should involve using the demand factor. According to the National Electrical Code (NEC) and industry standards, when calculating the total demand for appliances such as dryers in a residential setting, it’s important to apply the demand factors specified for such loads.

These demand factors help in accurately calculating the actual power usage, recognizing that not all appliances will be in use simultaneously at their full capacity. For example, if three dryers are available, it is unlikely that all will be operating at their maximum rated capacity at the same time. The demand factor provides a more realistic assessment of the load that will be drawn on the electrical system, resulting in a more effective system design that also ensures compliance with local codes.

The other choices do not reflect the need to apply demand factors effectively. Using a flat rate or a total without the demand factor disregards the behavior of appliance usage and can lead to overestimation of the necessary service capacity, which could potentially lead to complications or inefficiencies in the electrical system.