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

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3.9.18. Ladder jack scaffolding: Any ladder jack scaffolding shall be used by one worker at a time and in the following conditions:
(a)  on ladders which are securely fixed in position at top and bottom;
(b)  if the distance between the ladders is not more than 3 m;
(c)  if the falling height is not more than 3 m; and
(d)  if the platform is so supported that the load is transmitted to the rails and not to the rungs.
R.R.Q., 1981, c. S-2.1, r. 6, s. 3.9.18; O.C. 329-94, s. 47.