§ 111.105-50 Alternative standard to the classification of hazardous locations requirements of this subchapter.

This section contains alternative standards to the classification of hazardous locations requirements in §§ 111.105-29, 111.105-31, 111.105-32, 111.106-9, and 111.106-11. (a) Classification of hazardous locations may be in accordance with IEC 60092-502:1999 (incorporated by reference, see § 110.10-1 of this subchapter). (b) If IEC 60092-502:1999 is chosen as an alternative standard as allowed in paragraph (a) of this section, it shall be used exclusively and not in combination with §§ 111.105-29, 111.105-31, 111.105-32, 111.106-9, and 111.106-11. (c) If IEC 60092-502:1999 is chosen as an alternative standard as allowed by paragraph (a), the following ventilation system requirements apply in addition to the requirements of IEC 60092-502:1999: (1) Tank vessels that carry combustible or flammable cargo, carriers of liquid-sulphur or inorganic acid, and hydrocarbon pump rooms must meet the requirements in § 32.60-20(c) of this chapter, (2) Bulk liquefied flammable gas and ammonia carriers must meet the requirements in § 38.20-10 of this chapter, and (3) Mechanical ventilation on all applicable vessels must be capable of at least 30 air changes per hour, based upon the gross volume of the space, and must be provided for the following spaces: (i) Cargo handling or pump rooms, and (ii) Other spaces where hazardous location classification is dependent upon ventilation.