S-2.1, r. 14 - Regulation respecting occupational health and safety in mines

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489. A transformer having Class B or C insulation or filled with non-inflammable dielectric liquid shall be separated from a stope by fencing or a room built entirely of non-combustible materials.
For the purposes of this section, “Class B insulation” means insulation that provides protection at least equal to that of mica, asbestos, fibreglass wool or any other similar inorganic material bonded by organic substances, and “Class C insulation” means insulation that provides protection at least equal to that of mica, porcelain, glass, quartz or any other similar inorganic material.
O.C. 213-93, s. 489.