area within any pit, belowgrade area, or subfloor area

Area up to 450 mm (18 in.) above any such unventilated pit, belowgrade work area, or subfloor work area and extending a distance of 900 mm (3 ft) horizontally from the edge of any such pit, belowgrade work area, or subfloor work area

Any pit, belowgrade work area, or subfloor work area that is provided with exhaust ventilation at a rate of not less than 0.3 m 3/min/m2 (1 cfm/ft 2) of floor area at all times that the building is occupied or when vehicles are parked in or over

this area and where exhaust air is taken from a point within

300 mm (12 in.) of the floor of the pit, belowgrade work area,

or subfloor work area

Division 1 location, the entire room shall be classified as

Division 1

Vapor Processing Systems Pits 1 Any pit or box below grade level, any part of which is within a

Division 1 or Division 2 classified location or that houses any

equipment used to transport or process vapors

Vapor Processing Equipment Located

Within Protective Enclosures

FPN: See 10.1.7 of NFPA 30A-2008, Code for Motor Fuel Dispensing Facilities and Repair Garages.

Within any protective enclosure housing vapor processing equipment

Vapor Processing Equipment Not Within Protective Enclosures (excluding piping and combustion devices)

Equipment Enclosures

The space within 450 mm (18 in.) in all directions of equipment containing flammable vapor or liquid extending to grade level. Up to 450 mm (18 in.) above grade level within 3.0 m (10 ft) horizontally of the vapor processing equipment

Any space within the enclosure where vapor or liquid is present under normal operating conditions

Vacuum-Assist Blowers The space within 450 mm (18 in.) in all directions extending to grade level. Up to 450 mm (18 in.) above grade level within

3.0 m (10 ft) horizontally

'For marine application, grade level means the surface of a pier extending down to water level.

2Refer to Figure 514.3 for an illustration of classified location around dispensing devices.

•'Ceiling mounted hose reel.

4FPN: See 4.3.9 of NFPA 30A-2008, Code for Motor Fuel Dispensing Facilities and Repair Garages.

5FPN: Area classification inside the dispenser enclosure is covered in ANSI/UL 87-1995, Power-Operated

Dispensing Devices for Petroleum Products. [30A:Table 8.3.1]

Table 514.3(B)(2) Electrical Equipment Classified Areas for Dispensing Devices

Extent of Classified Area

Dispensing Device Class I, Division 1 Class I, Division 2

Compressed natural gas

Liquefied natural gas

Liquefied petroleum gas

Entire space within the dispenser enclosure

Entire space within the dispenser enclosure and

1.5 m (5 ft) in all directions from the

dispenser enclosure

Entire space within the dispenser enclosure; 450 mm (18 in.) from the exterior surface of the dispenser enclosure to an elevation of 1.2 m (4 ft) above the base of the dispenser; the entire pit or open space beneath the dispenser and within 6.0 m (20 ft)