What distinguishes load calculations for multi-family units from single-family homes?

The distinction in load calculations for multi-family units compared to single-family homes primarily revolves around shared services and occupancy patterns. In multi-family structures, multiple units are typically served by common electrical systems, which leads to unique considerations for load calculations.

For instance, the demand factors can be adjusted based on the number of units and how they are occupied at different times. Residents in a multi-family unit may have varying schedules, which can affect the overall peak demand. This contrasts with single-family homes, where the load is more predictable since the household typically operates on a single schedule. Additionally, shared areas in multi-family units, such as laundry rooms or hallways, must be accounted for in the overall load calculations, something that would not be relevant for a single-family home.

While building code requirements, square footage, and the number of electrical appliances certainly play roles in load calculations, they don't specifically capture the unique dynamic of shared services and variable occupancy that is characteristic of multi-family living arrangements.