Journeyman Electrician Practice Exam

Where is an equipment disconnecting switch located 6 feet above the floor in relation to any aircraft fuel tanks?

1. In a classified area

2. In a restricted area

3. In an unclassified area

4. In a hazardous area

The correct answer is: In an unclassified area

An equipment disconnecting switch positioned 6 feet above the floor in relation to aircraft fuel tanks is considered to be located in an unclassified area. This designation is based on safety standards and regulations that dictate the proper classification of areas where flammable liquids, such as aircraft fuel, are stored or dispensed. An unclassified area is typically deemed to have a lower risk of flammable vapor accumulation, allowing for certain electrical installations, including disconnecting switches, to be installed without the stringent requirements necessary in classified or hazardous areas. These regulations are meant to prevent ignition sources from being too close to flammable materials, ensuring safer operations around sensitive areas such as those involving aircraft fuel tanks. In contrast, classified areas would necessitate specific electrical equipment rated for use in potentially explosive atmospheres. Areas with heightened restrictions or hazards require more rigorous safety measures to mitigate risks connected with flammable gases or vapors. Thus, reputing the switch's appropriate location as unclassified acknowledges its placement in a relatively safer zone with respect to the aircraft fuel tanks.