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

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391. Where a chain is used in a shaft to suspend a conveyance or a work platform, the chain shall:
(1)  be of alloyed heat-treated steel and bear the letter “A” on each link to so indicate;
(2)  have a safety factor of at least 10 after taking into consideration its possible inclination;
(3)  be checked at least once a month and be discarded if:
(a)  the chain or any part thereof has stretched by 3% or more of its length;
(b)  a link is worn in one place through 10% or more of its diameter;
(c)  a link is cracked, misshapen or damaged.
O.C. 213-93, s. 391.