HOLT Electricians Practice Exam

What classification is assigned to various areas of an aircraft hangar that are below floor level or adjacent to the hangar?

1. Class II Division 1

2. Class I Division 1 or 2

3. Class III Division 1

4. Class IV Division 2

The correct answer is: Class I Division 1 or 2

The correct classification for areas of an aircraft hangar that are below floor level or adjacent to the hangar is Class I Division 1 or 2. This classification is relevant because it pertains to locations where flammable gases or vapors may be present due to the storage and maintenance of aircraft that often involve fuels and other combustible materials. Class I locations are those where flammable gases or vapors may exist in sufficient quantities to be hazardous. Division 1 applies to areas where ignitable concentrations of flammable gases or vapors can occur during normal operations or under certain fault conditions, while Division 2 indicates areas that may have rarely flammable substances present, typically during maintenance or abnormal conditions. This classification is essential for ensuring safety protocols and the installation of appropriate electrical equipment that can prevent ignition sources in potentially hazardous environments. In an aircraft hangar environment, which frequently involves the handling of various fuels and other materials that can produce flammable vapors, recognizing that the different divisions allow for more precise safety measures and compliance with regulations is critical. Therefore, understanding the distinction between Division 1 and 2 is crucial for ensuring the safety of personnel and equipment in these settings.