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What is the minimum diameter for a stairway handrail with a circular cross-section?

  1. A. 1" , 2"

  2. B. 1-1/4" , 2"

  3. C. 1-1/2" , 2-1/4"

  4. D. 1-3/4" , 2-1/2"

The correct answer is: B. 1-1/4" , 2"

The minimum diameter for a stairway handrail with a circular cross-section is 1-1/4 inches. This requirement is in place to ensure that the handrail can be grasped easily and securely by users. A diameter of 1-1/4 inches provides an adequate surface area for a variety of hand sizes, allowing for comfortable and safe gripping while using the stairs. In terms of safety standards set by organizations like the International Building Code (IBC) or the Americans with Disabilities Act (ADA), the dimensions of handrails are designed to enhance usability and ensure that they can support individuals who may rely on handrails for stability. The larger diameter options listed in the other choices exceed the minimum requirement and could potentially be less comfortable for some users who may have smaller hands. Hence, the minimum size strikes a balance between safety and functionality.