What is a common installation practice for mounting electrical panels?

The correct answer highlights the importance of securely fastening electrical panels and ensuring they are readily accessible. This practice is essential for safety and compliance with electrical codes. Securing panels prevents them from being moved or damaged, which could lead to exposure to live electrical components or create hazards.

Accessibility is key for both maintenance and emergency situations; individuals should be able to reach the panel without obstruction. Regular access allows for prompt service and troubleshooting, which is critical in preventing prolonged electrical outages or safety issues.

The other options, while they might contain elements of good practice, do not prioritize these critical aspects of installation. For instance, painting panels may enhance visibility but does not address safety or accessibility. Covering panels could impede access and also must adhere to specific code requirements regarding accessibility during an emergency. Installing panels at any height would be impractical, as it must align with recognized standards for ease of use and safety.