Western Australian Consolidated Regulations Western Australian Consolidated Regulations Where operations in
connection with the lowering of a pipeline into a trench or excavation are
being carried out, a person shall not enter any part of the trench or
excavation in which, or in the vicinity of which the operations are being
carried out, unless it is necessary to remove, replace or adjust slings or
bracing members supporting shoring; and in such cases the person shall remain
above the top of the pipeline.