In hangars that house fueled aircraft, the minimum distance above the floor for all electric power tools and regulators is:

In hangars that house fueled aircraft, the minimum distance above the floor for all electric power tools and regulators is:

• A. 12 inches
• B. 24 inches
• C. 6 inches
• D. 18 inches

Answer: (D)

When fueling operations are present, the risk of ignition from electrical tools or regulators must be minimized. Gasoline vapors are heavier than air and tend to linger near the floor, so keeping electrical equipment elevated reduces the chance that a spark or hot surface will contact a fossil fuel vapor layer. The minimum elevation specified—18 inches above the floor—provides a practical clearance that keeps tools and regulators out of the most vapor-dense zone, lowering ignition risk while still allowing access. If you can’t maintain this height, use equipment that is rated for use in hazardous areas and ensure proper ventilation and grounding as required.

When fueling operations are present, the risk of ignition from electrical tools or regulators must be minimized. Gasoline vapors are heavier than air and tend to linger near the floor, so keeping electrical equipment elevated reduces the chance that a spark or hot surface will contact a fossil fuel vapor layer. The minimum elevation specified—18 inches above the floor—provides a practical clearance that keeps tools and regulators out of the most vapor-dense zone, lowering ignition risk while still allowing access. If you can’t maintain this height, use equipment that is rated for use in hazardous areas and ensure proper ventilation and grounding as required.