183(1)Subject to subsection (2), an employer shall ensure that excavated material is kept at least 1.2 m away from the edge of an excavation or trench.
183(2)Where an excavation or trench is more than 1.8 m deep in rock, an employer shall ensure that
(a)
excavated material is located back from the face of the excavation or trench a distance equal to at least the height of the excavated material, or
(b)
a fence that is adequate to support the excavated material is erected at a minimum distance of 1 m from the face of the excavation or trench.