When are boxes required to be accessible according to NEC Article 314?

Boxes are required to be accessible primarily for maintenance purposes. This requirement ensures that electrical connections and devices within the boxes can be easily reached for any necessary repairs, inspections, or modifications. Accessibility is crucial to ensure safety and functionality in electrical systems, as it allows qualified personnel to address issues without needing to perform extensive or invasive work to reach hidden components.

The NEC emphasizes that accessibility is vital for maintaining the integrity of electrical installations and ensuring systems continue to operate safely over time. If boxes were not accessible, any necessary maintenance could become difficult, potentially leading to unsafe conditions or system failures.

In contrast, the other options emphasize situations where accessibility may not be as critical, such as initial installations or aesthetic considerations, which do not prioritize safety or maintenance needs. While boxes located in attics may require consideration for accessibility, it is not limited to only those locations as suggested in the last option. Thus, the emphasis on maintenance underlines why accessibility is an essential requirement according to NEC Article 314.