Which of the following indicates a light source according to NEMA symbols?

The correct answer indicates that the symbol "I" represents a light source according to NEMA (National Electrical Manufacturers Association) symbols. In the context of electrical symbols used in schematics and diagrams, a light source is typically depicted with the designation "I". This aligns with standard electrical terminology and conventions across various industries, where symbols are utilized for quick and clear communication of electrical components and their functions. Understanding these symbols is crucial for anyone working in electrical installations, as it enables efficient reading and interpretation of plans and wiring diagrams, facilitating proper installation and maintenance of lighting systems.

The other options do not signify a light source, and while they may represent other types of electrical components or functions, it is the symbol "I" that specifically denotes a light source according to the established NEMA specifications. Recognizing these distinct symbols helps professionals navigate electrical plans effectively.