Nonmetallic wiring methods exposed to chemicals must be inherently resistant based on their being ______ for the specific chemical reagent.

The correct choice emphasizes the need for nonmetallic wiring methods to be either listed or identified as being inherently resistant to specific chemical reagents.

When wiring methods are exposed to chemical environments, it’s crucial for safety and longevity that the materials used are compatible with those chemicals. A "listed" wiring method generally refers to products that have been tested and meet certain safety standards for chemical exposure, established by recognized testing organizations. Being "identified" suggests that the material has been acknowledged by industry experts or relevant codes as suitable for a specific application involving chemicals.

Both terms highlight the importance of ensuring that the wiring methods can withstand the potential degradation that chemicals could cause, hence maintaining electrical safety and integrity. By allowing for either option, the question recognizes that both listing and identification serve to verify a product's compatibility with certain chemicals, providing flexibility for compliance in different scenarios.