Answer :
Final answer:
The standard height for a railing is typically 42 inches from the top rail to the floor level, according to common safety standards like OSHA in the US. The provided specifications also describe a mobile staircase and wheelchair ramp design, including step heights and horizontal lengths, and the necessity of a handrail.
Explanation:
The question pertains to the specifications of a standard railing, particularly its vertical height.
While the height is not explicitly mentioned in the given question, standards such as OSHA in the United States typically require a 42 inches (107 cm) nominal height for safety railings from the upper surface of the top rail to the floor, platform, runway, or ramp level.
This ensures the safety of individuals on elevated platforms or stages. Given the context provided, this appears to be a design or engineering question, likely relevant to a student studying building codes or occupational safety in an engineering or architecture-related course.
The specifications provided also mention the design of a mobile staircase and wheelchair ramp.
These include the height of the mobile staircase, the height of each step, and the length of the horizontal part of each step. The mobile unit must fit in front of a stage with a height of 400 mm and have three steps, each with a flat part of 800 mm long.
Additionally, the wheelchair ramp is required to be 1,000 mm wide with a slope length of 2,433 mm at a 10° incline, and have a handrail for safety purposes.
