250. Where a hoist is used to transport persons, materials or equipment or during shaft sinking work, it shall have at least 2 separate braking devices that are activated by independent systems.
However, a machine with 2 drums, even if not equipped with a pinion brake, may be used single drum:(1) to bring up persons if a break prevents the balanced use of the hoist and there is no other mechanical means of evacuating those persons;
(2) during shaft inspections or maintenance work; the persons may then remain in or on the conveyance suspended from the fixed or clutched drum when changing balance;
(3) to transport material during shaft maintenance work.
Where a hoist has more than 2 braking systems for a single drum or for a friction hoist, the braking capacity must be such that the drum or friction hoist can be stopped even if one of the braking systems fails.
For the purposes of the first paragraph, a throttle controlled exhaust of a compressed air or steam hoist is considered to be a second means of braking.
O.C. 213-93, s. 250; O.C. 1326-95, s. 52; O.C. 465-2002, s. 20; O.C. 119-2006, s. 22; O.C. 221-2009, s. 21.