What Article's requirements do not apply to ac modules or ac module systems?

The requirements of Article 690 specifically address photovoltaic (PV) systems, focusing on the installation and operation of solar energy systems that convert sunlight into electricity. However, when it comes to ac modules or ac module systems, these items are designed to function closely with the electric utility grid and often incorporate integrated inverters that convert the generated DC power from solar cells directly into AC power. This design typically aligns more with the regulations outlined in other articles, such as Article 710, which relates to interconnection with the utility grid.

As a result, Article 690 does not apply to these systems because the fundamental characteristics and installation requirements of ac modules are governed by different standards that address their specific type of operation and integration into existing electrical systems. Therefore, option A is the correct answer as the requirements of Article 690 are not relevant to ac modules or ac module systems.