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United States · ADA · Illustrated standards guidance

Operable parts: reach ranges and controls

Forward and side reach guidance for accessible controls, switches and other operable parts, including obstructed reaches.

AccessibilityAnthropometry & ergonomics
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Chapter 3: Building Blocks Operable Parts Forward Approach and Reach Clear Floor Space [§309.2] > 24” Clear floor space for forward approaches must extend up to or, if 48” min knee or toe space is provided, below operable parts. This facilitates access since the forward reach does not extend beyond a 30” 36” wheelchair user’s toes. min min If clear floor space is obstructed on both sides more than half the minimum required depth, a wider clearance (36” min.) is required for maneuvering and sway. > 24” Knee and Toe Space If the forward reach to operable X parts extends over an obstruction, such as a counter, clearances for toes and knees is required below. The knee and toe space must be at least as deep as the reach depth measured from the leading edge of the obstruction. ≥ X 4

Edition and local adoption determine which requirements apply. Use the publisher’s document for the complete clauses, diagrams and amendments.