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The NEC does cover mobile homes and recreational vehicles, although they are not commonly considered buildings in the usual sense, they are "structures" as defined in the NEC, and they also may be covered by other standards or other jurisdictions.
Even though recreational vehicles are not "buildings" in the usual sense, they are defined as structures in the NEC.
For example, NEC Article 550 refers to NFPA 501: Standard on Manufactured Housing, as well as a Federal Standard 3280: Manufactured Home Construction and Safety Standards. Although Article 550 includes some requirements for installations in mobile homes and manufactured homes, much of the article is about the power supply to the mobile home.
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