Controls on class 2.1.1, 2.1.2, and 3.1 substances 58 Requirement to establish a hazardous atmosphere zone At any place containing class 2.1.1, 3.1A, 3.1B, or 3.1C substances in quantities in excess of those specified in table 3 in Schedule 3, the person in charge of the substances must ensure that a hazardous atmosphere zone is established that complies with--- (a) AS/NZS 2430.3; or (b) AS 2430.1: 1987 and NZS 6101.1: 1988; or (c) a code of practice approved by the Authority that specifies hazardous atmosphere zones equivalent to the requirements specified in paragraphs (a) and (b) and takes into account the risk of the presence of flammable materials.