What is the minimum calculated branch circuit lighting load for a 4,200 square foot dwelling unit?

To determine the minimum calculated branch circuit lighting load for a dwelling unit, the National Electrical Code (NEC) provides guidelines. For residential lighting loads, the calculation is typically based on a standard of 3 VA per square foot of habitable space.

In the case of a 4,200 square foot dwelling unit, the calculation would be as follows:

4,200 square feet × 3 VA/square foot = 12,600 VA.

This calculated value reflects how much power is considered necessary to adequately supply lighting for such a space under standard conditions. As such, the answer of 12,600 VA correctly represents the minimum requirement for branch circuit lighting load for the specified area, aligning with NEC recommendations for residential electrical design.