OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 8 Entrances, Walkways, Stairways and Ladders

Section 131 Fixed ladders in manholes

ASTM Standard C478-07, Standard Specification for Reinforced Concrete Manhole Sections, includes requirements for the design of steps and ladders installed in pre-cast reinforced concrete manholes used in sewer and water works. These requirements include the dimensions of steps and rungs and appropriate clearance distances.