S-2.1, r. 4 - Safety Code for the construction industry

Full text All the extensible parts of a scaffold shoring, including adjustment screws, shall comply with one of the following requirements:
(a)  bear a mark indicating that, beyond that mark, they are extended beyond the manufacturer’s requirements;
(b)  be equipped with a locking device that prevents their extension beyond the manufacturer’s requirements.
A table of the allowable loads and corresponding extension heights shall be available on the construction site premises.
O.C. 1413-98, s. 6.