When exposed to sunlight, nonmetallic raceways and components shall be ______.

In the context of wiring methods and materials, particularly regarding the use of nonmetallic raceways and components, it's essential to ensure that these materials can withstand exposure to sunlight without deteriorating or losing their effectiveness. Therefore, nonmetallic raceways and components must be either listed or identified as sunlight resistant.

When a raceway or component is "listed as sunlight resistant," it means that it has undergone testing and has been certified by a recognized standards organization to ensure it can handle UV exposure. On the other hand, if it is simply "identified as sunlight resistant," it may imply that the manufacturer provides information regarding its resistance to such exposure without necessarily having undergone formal testing.

Both conditions aim to ensure that materials used in installations in areas where they will be subjected to sunlight are adequately rated for such environments. This understanding underscores the importance of using appropriate materials in order to prevent potential failures or safety hazards in electrical systems. Hence, the correct answer encompasses both possibilities, allowing for flexibility in how manufacturers and suppliers provide assurance regarding the UV resistance of their products.