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Special Occupancies

Hazardous Occupancies

Specific Occupancies

Articles 511 through 517 provide some area classification details for common applications:

Article 511: Commercial Garages – Gives specific requirements to address the hazard that is present due to the presence and servicing of flammable or combustible fuel-powered vehicles. It deals with some locations where vehicles are serviced, but not with parking garages.
Article 513: Aircraft Hangars – Provides requirements similar to Article 511 but for aircraft servicing.
Article 514: Motor Fuel Dispensing Facilities – Also related to 511 and 513. Although these facilities may be thought of traditionally as dispensing gasoline or diesel fuel, now they may also dispense liquefied natural gas, liquefied petroleum, compressed natural gas or even hydrogen.

For these common types of facilities, the National Electrical Code defines the location and extent of classified areas and deals with any special conditions that might exist above or below the areas. For example, Article 511 addresses the pit in a commercial garage, defining and providing different rules for major and minor repair garages. Article 511 refers to Article 514 for fuel dispensing areas. Article 513 covers the area above and around the fuel tanks of an aircraft while it is in a hangar.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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