Article 511 applies to areas used for the service and repair operations of self‑propelled vehicles that use volatile flammable liquids or flammable gases (Fig. 1). Examples include passenger automobiles, buses, trucks, and tractors. If there’s any fuel dispensing in the building, the requirements of Art. 514 also apply.
Understanding Requirements for Commercial Garages and Fuel-Dispensing Facilities
Do you know the rules for fuels?