PART XV RIGGING — Slinging loads
369
(1) A sling shall be selected and used to prevent slipping or overstressing the sling or the load.
369(2)
A load consisting of 2 or more pieces of material over 3 metres long shall be slung using a 2-legged sling arrangement that is positioned to keep the load horizontal during the lift and each sling shall be choked around the load with a double wrap.
Not legal advice. Verify the cited article against the signed agreement.