What factor percentage can be used for load calculations for a cooktop rated at 2kW?

The correct answer, which suggests using a factor percentage of 75 for load calculations for a 2kW cooktop, is aligned with the method outlined in the National Electrical Code (NEC) for calculating load demand in residential settings. In cooking applications, the demand factors provide a way to more accurately predict the actual load that will be used, as they account for the intermittent nature of cooking appliances.

Using 75% in this context reflects the average expected load that will be drawn when the cooktop is in use. The NEC recognizes that not all appliances will be running at full capacity simultaneously, so applying this percentage allows for a reduction in the calculated load, which helps in sizing conductors and circuit breakers more appropriately.

In contrast, the other potential percentage options do not align with typical industry standards for load calculations for cooking appliances. For example, a much lower percentage like 11 would not adequately reflect the load generated during appliances' typical operation. Similarly, figures like 25 or 65 do not provide the necessary safety margin nor align with the general guideline established for these calculations. This understanding is critical for compliance with electrical codes and ensuring safe, efficient electrical design in residential applications.