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

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8.5.8. Any air line installed underground shall be:
(a)  if metallic, placed so that it is protected from any shock capable of being caused by equipment or self-propelled vehicles; or
(b)  if flexible, equipped with collars attached by a chain on each side of the coupling.
R.R.Q., 1981, c. S-2.1, r. 6, s. 8.5.8.