For ladders greater than 1m, a rung spacing 250 mm ≤ spacing ≤ 300 mm. tolerance of ±5 mm or better.
The distance between the bottom rung/tread and the bottom landing shall be 90% to 100% of the rung spacing
The top rung shall be level with, or be integrated into, the landing.
Rungs shall be securely connected to the stiles and shall not rotate.
The surface of rungs shall be slip resistant.
The width of the landing shall be not less than 600mm.
Landing length shall provide standing space ≤600mm clear of cross-traffic, door swing or any other structure.
Top landing length shall be ≤900 from the front of the ladder.
The maximum permissible cross-slope at bottom landing is 7°
Protection from fall:
The maximum height a step ladder can extend between landing with out added protection is 6m ≥70° to 75° and 4.5m for ≥75° to 90° otherwise a multiple step ladders with an intermediate landings are required. To limit the distance a person could fall, a change of direction by 180°, or staggering at each landing is required. All ladders are to be same in multiple-flight ladders.
Where a person could fall more than 6 m to a level below, the step ladder must be fitted with a side screen, or a ladder cage to prevent fall.
Where the above measures cannot be practicable other means can be implemented such as utilising a fall-arrest system complying with AS/NZS 1891.
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