What NEC section permits an alternative method for calculating loads in multi-family dwellings?

The correct choice refers to Section 220.84 of the National Electrical Code (NEC), which allows for an alternative method to calculate loads in multi-family dwellings. This section is significant as it provides electricians and engineers with a simplified approach for determining the service demand for multi-family units, accommodating the unique characteristics of these types of buildings.

This method takes into account the expected diversity of use and demand across multiple dwellings, recognizing that not all units will draw maximum load simultaneously. By applying this section, professionals can effectively compute the electrical load requirements, ensuring safety and efficiency in the design of the electrical service for multi-family residences.

Understanding this section is crucial for accurate load calculations, which can lead to better energy management and compliance with code requirements. It also plays an essential role in ensuring that the electrical systems are not only sufficient but also economical by avoiding oversizing of equipment.