What factor is considered when calculating lighting load for occupancies according to the NEC?

When calculating the lighting load for occupancies according to the National Electrical Code (NEC), unit values specified in the code play a critical role. The NEC provides standardized figures that indicate the amount of load, typically expressed in watts per square foot, required for various types of spaces. These values take into account the expected usage of the area and the function it serves, which allows for an accurate reflection of the electrical demand.

This standardized approach ensures that regardless of individual circumstance or preference, calculations are consistent and based on widely accepted criteria, ensuring safety and efficiency in electrical design. Considering these unit values ensures that lighting systems are appropriately sized to meet both functional and safety needs, thus preventing issues like under- or over-lighting.

In contrast, factors like current capacity and voltage drop are more related to the performance and delivery of power rather than the calculation of what load should be supplied for lighting. While lighting type does influence the overall energy consumption and quality of light experienced, it is the NEC-specified unit values that are essential for determining the lighting load of an occupancy.