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Subchapter 5. Electrical Safety Orders
Group 1. Low-Voltage Electrical Safety Orders
Article 59. Hazardous (Classified) Locations

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§2540.7. Gasoline Dispensing and Service Stations.

(a) Definition. A gasoline dispensing and service station is a location where gasoline or other volatile flammable liquids or liquefied flammable gases are transferred to the fuel tanks (including auxiliary fuel tanks) of self-propelled vehicles.

Other areas used as lubritoriums, service rooms, repair rooms, offices, salesrooms, compressor rooms, and similar locations shall comply with Section 2540.6 with respect to electric wiring and equipment. Where it can be determined that flammable liquids having a flashpoint below 38oC (100oF), such as gasoline, will not be handled, such a location may be classified as nonhazardous.

(Title 24, Part 3, Section 514-1.)

(b) Hazardous Locations.

(1) Vicinity of Dispenser. The space within the dispenser up to 4 feet from its base and the space within 18 inches extending horizontally from the dispenser up to 4 feet from its base shall be considered a Class I, Division 1 location. This classification shall also apply to any space below the dispenser that may contain electric wiring or equipment.

(2) Within 20 Feet of Dispenser. In an outside location, any area (excluding Class I, Division 1, but including buildings not suitably cut off) within 20 feet horizontally from the exterior enclosure of any dispensing pump shall be classified as a Class I, Division 2 location, which shall extend to a level 18 inches above driveway or ground level.

(3) Vicinity of Tank Fill-Pipe. In an outside location, any area (excluding Class I, Division 1, but including buildings not suitably cut off) within 10 feet horizontally from any tank fill-pipe shall be classified as a Class I, Division 2 location, which shall extend upward to a level 18 inches above driveway or ground level.

(4) Below Surface. Electric wiring and equipment, any portion of which is below the surface grade of locations defined as Class I, Division 1 or Division 2 in (1), (2) or (3) above, shall be classified as a Class I, Division 1 location, which shall extend at least to the point of emergency above grade.

(5) Overhead Dispensing Units. Where the dispensing unit, including the hose and hose nozzle valve, is suspended from a canopy, ceiling, or structural support, the Class I, Division 1 location shall include the volume within the enclosure and shall also extend 18 inches in all directions from the enclosure where not suitably cut off by a ceiling or wall. The Class I, Division 2 locations shall extend 2 feet horizontally in all directions beyond the Division I classified location and extend to grade below this classified location. In addition, the horizontal area 18 inches above grade for a distance of 20 feet, measured from a point vertically below the edge of any dispenser enclosure, shall be classified as a Division 2 location. All electric equipment integral with the dispensing hose or nozzle shall be approved for Class I locations.

(6) Vicinity of Tank Vent-Pipe. The spherical volume within a 3-foot radius from point of discharge of any tank vent-pipe shall be classified as a Class I, Division 1 location, and the volume between 3-foot to 5-foot radius from point of discharge of a vent shall be classified as a Class I, Division 2 location. For any vent that does not discharge upward, the cylindrical volume below both the Division 1 and 2 locations extending to the ground shall be classified as a Class I, Division 2 location. The hazardous location shall not extend beyond an unpierced wall.

(7) Pits Below Grade. In addition to the requirements of Section 2540.8(a) (Definition), the space within any pit, or space below grade in lubrication rooms, shall be classified as a Class I, Division 1 location. The area within the entire lubrication room up to 18 inches above the floor or grade, and the space within 3 feet measured in any direction from the dispensing point of a hand-operated unit dispensing Class I liquids, shall be classified as a Class I, Division 2 location.

(8) Vapor Processing (Recovery) System.

(A) Pits. Any pit, box or space below grade level, any part of which is within a Division 1 or 2 classified area or which houses any equipment used to transport or process vapors shall be classified as a Class I, Division 1 location.

(B) Vapor Processing Equipment Located Within Protective Enclosures. The space within any protective enclosure housing vapor processing equipment shall be classified as a Class I, Division 2 location.

(C) Vapor Processing Equipment Not Within Protective Enclosures (excluding piping and combustion device). The space within 18 inches in all directions of equipment containing flammable vapor or liquid extending to grade level and up to 18 inches above grade level within 10 feet horizontally of the vapor processing equipment shall be classified as a Class I, Division 2 location.

(D) Equipment Enclosures. Any area within the enclosure where vapor or liquid is present under normal operating conditions shall be classified as a Class I, Division 2 location. The entire area within the enclosure, other than Division 1, shall be classified as a Class I, Division 2 location.

(E) Vacuum Assist Blowers. The space within 18 inches in all directions extending to grade level and up to 18 inches above grade level within 10 feet horizontally shall be classified as a Class I, Division 2 location.

(Title 24, Part 3, Section 514-2.)

(c) Circuit Disconnects. Each circuit leading to or through a dispensing pump shall be provided with a switch or other acceptable means to disconnect simultaneously from the source of supply all conductors of the circuit, including the grounded neutral, if any.

(Title 24, Part 3, Section 514-5.)

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.

HISTORY

1. Editorial correction of NOTE filed 11-2-83 (Register 83, No. 45).

2. Amendment of subsection (b) Title 24 cross references only filed 8-27-86; effective thirtieth day thereafter (Register 86, No. 37).

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