1 locations, as applicable:

(1) The interior of spray booths and rooms except as specifically provided in 516.3(D).

(2) The interior of exhaust ducts.

(3) Any area in the direct path of spray operations.

(4) For open dipping and coating operations, all space within a 1.5-m (5-ft) radial distance from the vapor sources extending from these surfaces to the floor. The vapor source shall be the liquid exposed in the process and the drainboard, and any dipped or coated object from which it is possible to measure vapor concentrations exceeding 25 percent of the lower flammable limit at a distance of 300 mm (1 ft), in any direction, from the object.

(5) Sumps, pits, or belowgrade channels within 7.5 m (25 ft) horizontally of a vapor source. If the sump, pit, or channel extends beyond 7.5 m (25 ft) from the vapor source, it shall be provided with a vapor stop or it shall be classified as Class I, Division 1 for its entire length.

(6) All space in all directions outside of but within 900 mm (3 ft) of open containers, supply containers, spray gun cleaners, and solvent distillation units containing flammable liquids.

(C) Class I or Class II, Division 2 Locations. The follow- ing spaces shall be considered Class I, Division 2, or Class I, Zone 2, or Class II, Division 2 as applicable.

(1) Open Spraying. For open spraying, all space outside

of but within 6 m (20 ft) horizontally and 3 m (10 ft)
operated unless the
exhaust ventilation system is
vertically of the Class I, Division 1 or Class I, Zone 1
location as defined in 516.3(A), and not separated from
it by partitions. See Figure 516.3(C)(1). [33:6.5.1]

(2) Closed-Top, Open-Face, and Open-Front Spraying.

If spray application operations are conducted within a
closed-top, open-face, or open-front booth or room,
any electrical wiring or utilization equipment located
operating and functioning properly and spray
application is automatically stopped if the exhaust
ventilation system fails. [33:6.5.2.2]

(3) Open-Top Spraying. For spraying operations con- ducted within an open top spray booth, the space 900 mm (3 ft) vertically above the booth and within 900 mm (3 ft) of other booth openings shall be considered Class

outside of the booth or room but within the boundaries
designated as Division 2 or Zone 2 in Figure 516.3(C)(2)
shall be suitable for Class I, Division 2, Class I, Zone 2, or
Class II, Division 2 locations, whichever is applicable.
I, Division 2; Class I, [33:6.5.3]

(4) Enclosed Booths

Zone 2; or Class II, Division 2.

and Rooms. For spraying

The Class I, Division 2, Class I, Zone
2, or Class II,
operations confined to an enclosed spray booth or
Division 2 locations shown in Figure 516.3(C)(2) shall
extend from the edges of the open face or open front
of the booth or room in accordance with the following:

(a) If the exhaust ventilation system is interlocked with the spray application equipment, the Division 2 or Zone 2 location shall extend 1.5 m (5 ft) horizontally and 900 mm (3 ft) vertically from the open