When securing an enclosure to a finished surface, how must it be secured?

Securing an enclosure to a finished surface must be done rigidly to ensure that it remains stable and securely in place. This is crucial for maintaining the integrity of the electrical system contained within the enclosure. A rigid installation prevents movement that could lead to wear, damage, or potential failure of the equipment, as well as reduce the risk of hazards such as electrical arcing or loosened connections. Additionally, proper securement supports compliance with safety regulations and standards set by the National Electrical Code, which emphasizes the importance of ensuring installations are safe and reliable.