Using Informative Annex D Example D6, what is the calculated kW demand for 25 ranges, each rated at 16 kW?

To determine the calculated kW demand for the given scenario, it’s essential to understand the application of demand factors for electric ranges, which typically have specific adjustment values according to the NEC (National Electrical Code) guidelines.

For 25 ranges, each rated at 16 kW, the total potential load without any demand factor would be the multiplication of the number of ranges by their individual capacity. Thus, if you simply multiply 25 by 16 kW, the total load would be 400 kW. However, electrical codes generally allow for demand factors to reduce this total load based on usage patterns.

Following the specific guidelines from Informative Annex D Example D6, a common demand factor for ranges is used to account for the practical usage of the devices in a residential or similar context. Depending on the application, this might mean that not all ranges are used at their full capacity simultaneously.

In typical calculations for ranges, the first few units are counted at full capacity, and then demand factors are applied to subsequent units. In this case, where 25 ranges are involved, a commonly applied total demand factor might yield a more realistic kW demand figure.

By correctly applying the appropriate demand factors from the code, the calculated kW demand comes