1. (a) The following areas shall be classified as Class I, Division I Locations:

   1. (1) Below grade well cellars (see Figures 7 and 9).

   2. (2) Enclosed areas; such as, wellhead, compressor or pump rooms where volatile flammable liquids or gases may be present in concentrations sufficient to render the area a hazardous location (see Figures 8, 9 and 10).

      Exception: Adequately ventilated enclosed areas shall be permitted to be classified as Class I, Division 2 Locations (see Figure 7).

2. (b) The following areas shall be classified as Class I, Division 2 Locations:

   1. (1) Within 10 feet horizontally and 18 inches vertically from the well casing and 3 feet radially from the stuffing box of all producing wells equipped with beam pumping units (see Figures 8 and 9).
   2. (2) Within 10 feet horizontally and 18 inches vertically above grade from the edge of well cellars or other below grade Class I, Division I Locations.
   3. (3) Within 10 feet horizontally and vertically from openings in enclosed areas classified as Class I, Division I Locations in Subsection (a) above (see Figures 3, 4, 5 and 10).
3. (c) Areas within a 10-foot radius of oil field auxiliary equipment, such as gas vents, oil-gas separator vessels, tanks, pumps, compressors and similar equipment, shall be classified in accordance with Figures 11 through 19.

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. Editorial correction of subsection (c) filed 11-3-83 (Register 83, No. 45).

3. Amendment of subsection (c) filed 8-27-86; effective thirtieth day thereafter (Register 86, No. 37).