Electrical wiring installed in aircraft hangar floors must comply with the requirements for which location type?

The correct answer is that electrical wiring installed in aircraft hangar floors must comply with requirements for Class I, Division 1 locations. This classification is critical because aircraft hangars are areas where flammable vapors or gases are likely to be present due to the storage of combustible liquids such as fuels and lubricants.

Class I, Division 1 areas are defined as locations where ignitable concentrations of flammable gases or vapors can exist under normal operating conditions. In the context of an aircraft hangar, the presence of fuels can lead to hazardous conditions, making it imperative that electrical equipment and wiring is designed to prevent ignition sources.

This requirement ensures that the installation of electrical wiring adheres to stringent safety standards to mitigate the risk of explosions or fire. By being classified as Division 1, it indicates that the potential for exposure to hazardous atmospheres is present continuously or frequently, necessitating the highest level of protection for electrical installations in these environments. Codes and standards, such as those established by the National Electrical Code (NEC), play an essential role in guiding the specifications for safe installations.