What is the demand factor for five household electric dryers?

In the context of electrical installations, the demand factor is a crucial consideration that helps determine the load that will be served by an electrical system. For household electric dryers, the National Electrical Code (NEC) provides guidelines on calculating the demand factor based on the number of appliances.

When assessing the demand factor for multiple household dryers, it's typical to apply a percentage that reflects how not all appliances will be used at their full capacity simultaneously. For five household electric dryers specifically, the demand factor is established at 85%. This reflects a practical understanding of usage patterns and accounts for the fact that not every dryer will be operating at the same time during peak hours.

This demand factor effectively helps in sizing the electrical service necessary to accommodate the load without overestimating the capacity. By applying a factor of 85%, it ensures that the electrical system can handle the typical operational demand while also optimizing efficiency and preventing potential overloads.

The other options present different demand factors that would not accurately represent the technical guidelines as stipulated in the NEC and may lead to over-expenditure on electrical capacity if applied in practical scenarios for household dryers.