The NEC applies to installations of electrical conductors, equipment, and raceways in which of the following?

The National Electrical Code (NEC) provides a set of standards designed to ensure safe electrical installations. While it applies broadly across various types of structures, it is particularly relevant to specific environments.

In the case of recreational vehicles, the NEC does apply as these vehicles require specific electrical installations to ensure safety and functionality. The code outlines requirements for wiring methods, equipment, and systems within recreational vehicles to protect users from potential hazards.

On the other hand, the NEC is not limited to just recreational vehicles; it also applies to commercial buildings, residential homes, and industrial facilities. Each of these types of installations has its own unique requirements under the NEC to address the varying electrical needs and safety considerations intrinsic to the setting.

Thus, while recreational vehicles are indeed covered by the NEC, it's important to recognize that the code also encompasses a broader spectrum of applications beyond this choice.