Questions and Answers
Always install stairways between ___ and ___ degrees from the horizontal.
30;50
Variations in riser height or tread depth shall not be over ___ in any stairway system.
1/4 inch
Stairway landings must be at least 30 inches deep and 22 inches wide at every 12 feet or less of vertical rise.
True
Handrails and top rails must be capable of withstanding a load of 200 pounds.
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The height of handrails must not be more than ___ inches nor less than ___ inches from the upper surface of the handrail to the surface of the tread.
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What is the required clearance of temporary handrails between the handrail and walls?
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How high must a handrail be when measured from the upper surface of the handrail to the tread?
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Always use double-cleated ladders when they are the only way to enter and exit a working area with 25 or more employees.
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How far must the ladder side rails extend above the upper landing surface?
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Portable ladders must be able to withstand ___ times their maximum load.
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The working length of a ladder is the distance between the foot and the top support.
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What is the maximum intended load used for the design of portable ladders?
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End frames of scaffolds and ladders in elevator shafts shall have rungs and steps spaced not less than ___ inches and not more than ___ inches apart.
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Ladders having a pitch in excess of 90 degrees from horizontal are permitted.
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When a ladder does not extend at least three feet above an upper landing surface, it must be secured at the top.
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Study Notes
Stairway Regulations
- Stairways must be installed at an incline of 30 to 50 degrees from the horizontal.
- Riser heights and tread depths in stairways must not vary by more than 1/4 inch.
- Stairway landings must be at least 30 inches deep and 22 inches wide for vertical rises of 12 feet or less.
Handrail Requirements
- Handrails and top rails must withstand a force of 200 pounds; designs must avoid dangerous projections.
- Handrail heights should be between 30 inches and 37 inches from the tread surface.
- Stair rail systems installed after March 15, 1991, require heights of 36 to 37 inches; older systems may have heights ranging from 30 to 34 inches.
- Clearance for temporary handrails must be at least three inches from walls.
Ladder Specifications
- Rung spacing should be between 10 to 14 inches, with uniformly spaced cleats and steps.
- Double-cleated ladders are mandatory when ladders are the only access point for 25 or more workers, also for two-way traffic.
- Fixed ladders must support two loads of at least 250 pounds.
- Portable ladders need to extend at least 3 feet above upper landing surfaces.
Load Capacity and Performance
- Warning labels on ladders must be positioned on the outside face of one side rail.
- Portable ladders must withstand four times their maximum designated load, which is at least 200 pounds.
- Each non-self-supporting ladder should support four times the maximum intended load at a 75 1/2 degree angle.
- For scaffolds and ladders in elevator shafts, rungs must be spaced no less than 6 inches and no more than 16.5 inches apart along the side rails.
Usage Guidelines
- Ladders with an angle exceeding 90 degrees from the horizontal are prohibited, with exceptions for fixed ladders in conical manhole sections.
- Non-self-supporting ladders should be positioned so that the horizontal distance from the top support to the foot is about one-fourth of the working length.
- If a ladder does not extend at least three feet above an upper landing, it must be secured at the top and equipped with a grasping device for safety.
- Ladder steps and rungs must be level and uniformly spaced for operational safety.
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Description
This quiz covers essential safety regulations for stairways and ladders in construction environments. It includes important specifications regarding stairway incline, riser heights, handrail requirements, and ladder dimensions. Test your knowledge of these crucial safety standards to ensure compliance and safety on the job site.
