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

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8.5.7. Unless equipped with a threaded coupling, compressed air hoses of 50 mm or more in interior diameter, mounted on a jumbo, shall be equipped at each end with a steel cable 5 mm in diameter or with an equivalent safety chain to prevent a whipping action.
Compressed air hoses smaller in diameter shall be equipped with a self-tightening device.
R.R.Q., 1981, c. S-2.1, r. 6, s. 8.5.7.