Section 21-3. Excavation of trenches that require shoring

When digging trenches deeper than 3.0 m, the shoring shall be dimensioned by a qualified person and documentation of the calculations shall be available on request. When using prefabricated shoring or other means of personal protection in trenches, the instructions for use shall clearly show what depths and what soils the structure is designed for. The requirement for documentation of calculations in the workplace will then lapse. In this context, piles are not deemed to be prefabricated and shall be dimensioned by a qualified person for depths greater than 3.0 m.