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S-2.1, r. 4 - Safety Code for the construction industry
Section 3.8.3
Disposition versions
3.8.3. Construction:
(1) Any guardrail shall be between 1 m and 1.2 m above the surface on which the worker is working.
(2) A wooden guardrail shall consist of:
(a) top plate not less than 40 mm thick by 90 mm wide, supported on posts of the same dimension spaced at intervals of not more than 1.8 m and placed so that the 90 mm width of the post is on the axis of the width of the top plate;
(b) an intermediate rail not less than 75 mm wide at midway and securely fastened to the inner side of the posts; and
(c) a toe-board at least 90 mm high and securely fastened to the inner side of the posts.
(3) A guardrail of steel wire ropes shall be maintained rigid by means of a turn-buckle and consist of:
(a) a wire rope at least 10 mm in diameter for the top-rail and the intermediate rail;
(b) steel posts spaced at intervals of not more that 3 m; and
(c) a toe-board of at least 90 mm high and securely fastened to the inner side of the posts.
