What is the minimum general lighting load, in VA per square foot, required by the NEC for an office building?

The minimum general lighting load required by the National Electrical Code (NEC) for an office building is established to ensure adequate illumination for safety and productivity. The correct value is 3-1/2 VA per square foot, which reflects industry standards for typical office environments.

This load is determined based on the assumption of typical office tasks and the necessary lighting levels required for them. By specifying a minimum load, the NEC seeks to prevent under-design of electrical systems that could lead to inadequate lighting, negatively affecting the occupants' work conditions.

Other values provided in the choices, while they may represent lighting loads for different types of spaces or outdated codes, do not meet the current NEC standard for office spaces. This makes the specified 3-1/2 VA per square foot the most appropriate choice for ensuring compliance with modern electrical codes and ensuring that spaces are safely and effectively lit for their intended use.