In which conditions can non-metallic raceways be appropriately used?

Non-metallic raceways are specifically designed for use in environments that may be exposed to moisture and corrosive substances. This makes them particularly suitable for areas such as chemical processing facilities, outdoor installations, or anywhere where there is a risk of exposure to elements that could cause corrosion. The materials used in non-metallic raceways, such as PVC or fiberglass, are resistant to many chemicals and can endure moisture without degrading, which is critical for maintaining electrical safety and integrity in such environments.

In contrast, the other conditions listed would not typically support the use of non-metallic raceways. High electrical loads could lead to overheating issues in non-metallic raceways not designed to handle such demands. On the other hand, using non-metallic raceways in settings with high temperatures could also be problematic, as certain materials may soften or warp under extreme heat. While it is true that non-metallic raceways can be used indoors in dry settings, they are not limited to these environments alone. Thus, the correct scenario is where exposure to moisture and corrosive elements is present, allowing for the effective application of non-metallic raceways.