(1) For these regulations, if different kinds of explosive articles of hazard division 1.6 are stored or carried together, their collective hazard division is taken to be hazard division 1.1, unless subregulation (2) applies.
(2) The collective hazard division of the explosive articles may be treated as hazard division 1.6 if the person seeking to treat them as such establishes that it is proved by testing or analogy that there is no additional risk of sympathetic detonation between the articles.