OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 33 Explosives Safety


  • Section 467 requires employers to prepare safe work procedures specific to the blasting activities. Safe work procedures for the handling of pyrotechnic and special effects devices and explosives must be based on the referenced National Fire Protection Association (NFPA) standards. (Section 8 of the OHS Regulation requires that the procedures be in writing and available to workers.)
  • Section 503 refers to new and revised minimum-separation distance tables applicable to radiofrequency transmitters and explosives. The tables distinguish between fixed radiofrequency transmitters, such as television transmitter towers, and mobile transmitters, such as portable two-way radios and cellular telephones.
  • Section 515 permits the pre-priming of charges during avalanche control activities. The priming of charges is normally restricted to blasting sites. The Canadian Avalanche Association has demonstrated that the pre-priming of explosive charges and their subsequent careful transport is a safe practice for avalanche control purposes.
  • Section 516 presents requirements specific to oil well blasting and perforating.
  • Section 466 prohibits the presence of burning materials in the vicinity of explosives. Section 517 recognizes that seismic drills operating in remote locations under cold conditions routinely using an open flame to thaw frozen water and water pipes required during drilling. The section therefore permits the use of an open flame heating device during seismic drilling if the listed conditions are met.