In cases where solid rock prevents compliance with minimum cover depths, how should raceways be covered?

When solid rock inhibits the ability to achieve the minimum cover depths required for raceways, providing a cover layer of 2 inches of concrete serves as an effective solution. This approach not only protects the raceways from physical damage due to surface loads but also maintains compliance with safety standards while ensuring the durability and integrity of the electrical systems within.

Concrete coverage is essential as it acts as a protective barrier, preventing mechanical impact and environmental degradation. A depth of 2 inches strikes an appropriate balance to ensure both protection and compliance, reflecting standards outlined in the National Electrical Code (NEC) and other regulatory guidelines. This depth is typically adequate to provide the necessary shielding while not being excessively thick, which could complicate installation procedures or contribute to unnecessary material usage.

Choosing a different thickness, such as 1 inch, might not offer sufficient protection, while higher thicknesses could be impractical or unnecessary. Therefore, the 2-inch concrete cover is a well-established standard that effectively addresses the limitations imposed by solid rock conditions.