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When conduits are exposed to direct sunlight, especially on rooftops, their ambient temperature can be significantly affected. The increase in temperature can be attributed to the process of solar radiation heating the surface of the conduits. In scenarios where conduits are located on rooftops, the temperature rise can frequently exceed typical ambient air temperatures due to direct sun exposure.

In this specific context, a 60°F increase in the ambient temperature is recognized as a standard adjustment to ensure that electricians account for the added heat that conduits will experience when placed in such environments. This adjustment helps in accurate calculations for conductor ratings, derating factors, and overall system safety. It is crucial for professionals to consider this factor in their design and installation practices to avoid overheating and ensure reliable operation of electrical systems.

The other temperature increases, while notable, do not sufficiently reflect the real-world conditions that conduits endure when placed under direct sunlight on elevated surfaces, leading to potential underestimation of temperature rise in those scenarios. Understanding this concept is vital for compliance with electrical codes and ensuring the longevity and safety of electrical installations.