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

Full text
533. A trolley wire shall be supported by insulated hangers, solidly attached to the roof or ceiling and may not zigzag. In travelways the clearance between a trolley wire and the roof or ceiling shall be at least 75 mm (3.0 in) when the trolley passes through.
O.C. 213-93, s. 533.