The maximum height a step ladder can extend between landing is 6 m
Step ladders incline angle nominally between 60° and 70°.
The width of the step ladder between the stiles is 450mm to 750mm.
The minimum clearance required for a step ladder is 200mm from the nosing of the tread to any structure behind it.
Front clearance shall be a distance of 900mm parallel to the nosing slope when the ladder is inclined at 70° and 1000mm when the ladder is inclined at 60°.
Minimum headroom is typically 2000 mm, this may need to be increased if helmets are worn.
Dimensions of treads
Treads depth min 100 mm. The surface of every tread shall be slip-resistant.
Treads shall be equally spaced at distances between 200 mm to 300 mm within a tolerance of ±5 mm.
The top tread shall be level with, or be integrated into, the landing.
The maximum permissible cross-slope at bottom landing is 7°
Handrails shall be provided on each side of the step ladder, with clearance between the handrails 550mm to 750mm.
The bottom of the handrails shall commence at a point no more than 900 mm above the landing.
handrails distance shall be 150mm to 200mm measured perpendicular from the nosing of the treads.
The width of the landing shall be not less than the width of the ladder or 600 mm, whichever is the greater.
Landing length shall provide standing space ≤600 mm clear of cross-traffic, door swing or any other structure.
Top landing length shall be ≤900 from the front of the ladder.
Protection from fall
The maximum height a step/rung ladder can extend between landing is 6 m. For vertical distance greater than 6m multiple step/rung 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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