Under what conditions can junction boxes be left accessible in a building?

Junction boxes must be accessible for maintenance and inspection to ensure safe and efficient operation of the electrical system. This accessibility requirement is crucial because it allows electricians and authorized personnel to perform necessary maintenance, troubleshoot issues, and inspect connections to prevent electrical hazards.

The National Electrical Code (NEC) emphasizes the importance of accessibility to junction boxes since they often contain splices and connections that may require future service. By ensuring that junction boxes are reachable, the risk of electrical fires, shorts, or other issues is minimized, and it enhances overall safety in the electrical installation.

While some other choices present specific scenarios, they do not reflect the broader requirement that junction boxes need to be accessible in general, regardless of their contents or location within the building.