Which of the following would NOT be a reason to use non-metallic raceways?

The use of non-metallic raceways is often favored in specific situations due to their unique properties, making them suitable for environments where metal could pose risks. Heavy electrical loads are typically a factor that suggests the need for sturdier, more conductive materials that can handle the associated heat and electrical demands. Non-metallic raceways are generally not designed to bear heavy electrical loads as effectively as metallic options, which can manage higher temperatures and provide better grounding properties.

In contrast, scenarios involving exposure to moisture, corrosive environments, or areas vulnerable to rust are precisely where non-metallic raceways excel. They are resistant to moisture, do not corrode like metal, and therefore offer significant advantages in such contexts. This highlights the reason why heavy electrical loads would not justify the use of non-metallic raceways.