GASOLINE DISPENSING, SERVICE STATIONS

70-513 Table 514-2. Class I Locations - Service Stations (cont.) Class I, Group D Location Division Extent of Classified Location 2 Area up to 18 inches above any such unventilated pit, below-grade work area, or subfloor work area and extending a distance of 3 feet horizontally from the edge of any such pit, below-grade work area, or subfloor work area. Non- Any pit, below-grade work area, classified or subfloor work area that is ventilated in accordance with 5-1.3. Special Enclosure Inside 1 Entire enclosure Building** Sales, Storage, and Rest Non- If there is any opening to these Rooms classified rooms within the extent of a Division 1 location, the entire room shall be classified as Division 1. Vapor Processing Systems Pits 1 Any pit, box, or space below grade level, any part of which is within a Division 1 or 2 classified location or that houses any equipment used to transport or process vapors. Vapor Processing Equipment 2 Within any protective enclosure Located within Protective housing vapor processing equip- Enclosures ment (FPN): See Automotive and Marine Service Station Code, NFPA 30A-1990, Section 4-5.7 Vapor Processing Equipment 2 The space within 18 inches in all Not within Protective Enclodirections of equipment containsures (excluding piping and ing flammable vapor or liquid combustion devices) extending to grade level. Up to 18 inches above grade level within 10 feet horizontally of the vapor processing equipment. Equipment Enclosures 1 Any space within the enclosure where vapor or liquid is present under normal operating conditions. Vacuum-Assist Blowers 2 The space within 18 inches in all directions extending to grade level. Up to 18 inches above grade level within 10 feet horizontally. For SI units: one inch = 2.5 cm; one foot = 0.3048 meter. ¹Refer to Figure 1 for an illustration of classified location around dispensing devices. * *Ceiling mounted hose reel. (FPN): See Automotive and Marine Service Station Code, NFPA 30A-1990, Section 2-2. 70-514 NATIONAL ELECTRICAL CODE Location Class 1 Div. 1 Class 1 Div. 2 20' 18" 18" Q 18" 20' 20' Dispensers Figure 1. Classified Locations Adjacent to Dispensers as Detailed in Table 514-2. Exception No. 1: Type MI cable shall be permitted where it is installed in accordance with Article 330. Exception No. 2: Rigid nonmetallic conduit complying with Article 347 shall be permitted where buried under not less than 2 feet (610 mm) of earth. Where rigid nonmetallic conduit is used, threaded rigid metal conduit or threaded steel intermediate metal conduit shall be used for the last 2 feet (610 mm) of the underground run to emergence or to the point of connection to the aboveground raceway; an equipment grounding conductor shall be included to provide electrical continuity of the raceway system and for grounding of noncurrent-carrying metal parts.