What type of installation requires that the outlet box connections remain accessible?

The correct answer revolves around the principle that for any electrical installation to be safe and manageable, certain connections must remain accessible for maintenance, troubleshooting, and potential future modifications. This is especially crucial in instances where electrical components are housed in outlet boxes.

When discussing accessible installations, it specifically refers to setups where the connections can be easily reached without needing to disassemble walls or other structures. This approach ensures that electricians and other professionals can perform necessary inspections, repairs, or upgrades safely and efficiently.

In contrast, permanent installations generally indicate a setup that is intended to remain in place for an extended period, but they do not inherently emphasize accessibility. Temporary installations may be designed for short-term use and might not follow the guidelines for accessibility as strictly. Concealed installations, by their very nature, may involve connections that are hidden from view and could complicate future access.

Overall, the requirement for outlet box connections to be accessible aligns with safety standards and best practices within electrical work, thereby allowing for the necessary accessibility to perform effective electrical maintenance.