Which of the following installations ARE covered by the NEC?

• A. Ferry boats
• B. Towers used for cell-phone signal transmission
• C. Jets such as 767s
• D. None of the above

Answer: (D)

The main idea here is understanding the scope of the NEC. The National Electrical Code is written for electrical installations in fixed, land-based structures used for occupancy—things like buildings, factories, and other permanent installations on property. It is not the code that governs electrical systems on moving vehicles or aircraft, nor does it routinely cover specialized transmission towers under its standard scope. Those environments are regulated by other codes and authorities specific to ships, aircraft, and telecom infrastructure. Because ferry boats (moving vessels), towers used for cell-phone signal transmission, and jets (aircraft) fall outside the NEC’s typical scope, none of these installations are covered by it. The result is that none of the listed options are within the NEC’s coverage.