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The common requirement for using non-metallic raceways according to NEC guidelines includes that they must be installed in dry areas only. This is because non-metallic materials, such as PVC or other plastic raceways, are particularly susceptible to damage in wet or damp locations. Moisture can compromise the integrity of these materials, leading to potential safety hazards like corrosion or electrical malfunction.

In contrast, other options may not apply as general requirements for non-metallic raceways. For instance, while some installations may indeed require fire-resistance ratings, not all non-metallic raceways need to meet this criterion. Similarly, non-metallic raceways do not have to be buried underground; in fact, many are designed for above-ground use in various applications. The requirement to accommodate future wiring changes is more about planning and installation best practices rather than a specific NEC regulation for non-metallic raceways. Thus, focusing on dry area installation is a fundamental guideline that ensures the safety and durability of these systems.