ANSI SAIA A92.3-2006 pdf download Manually Propelled Elevating Aerial Platforms
4.11.2.4 Control System Protection. The controls system shall be designed so that a single malfunction in the control system will not result in unintended movement of the platform.
4.11.2.5 Security. A security means shall be provided to protect against unauthorized use of the aerial platform.
4.12 Platforms
4.12.1 Width, Length, and Surface. Platform width and length shall be at least 18 inches (.46 m). The platform floor shall have a slip resistant surface.
4.12.2 Guardrail System. The platform shall include a guardrail system around its periphery. If the guardrail system is removable or can be lowered, the means used to secure it in the normal operating position shall be readily accessible for inspection and maintenance.
4.12.2.1 Flexible Materials. Flexible materials such as cables, chains, and ropes shall not be used in the guardrail system.
4.12.2.2 Top rail . The guardrail system shall include a top rail around its upper periphery. The height of the top rail above the platform shall be 42 inches ± 3 inches (1.07m ± 0.08m). Equivalent structure may be used in place of top rails, but shall meet the strength requirements described in 4.9.2.4.
4.12.2.3 Midrail. The guardrail system shall include a midrail approximately midway between the top rail and the platform surface. Equivalent structure may be used in place of midrails, but shall meet the strength requirements described in 4.12.2.4.
4.12.2.4 Structural Integrity. Each top rail, midrail, or equivalent vertical barrier shall withstand a concentrated load of 300 pounds ( 1334 N), applied at any point in any direction without reaching ultimate strength.
4.12.3 Toe boards. The platform shall include toe boards on all sides. The minimum toe board height shall be 4 inches (10.2cm). Toe boards may be omitted at the access opening(s).
4.12.4 Access. The aerial platform shall include means for personnel to use in entering onto or exiting from the platform when in the lowered position. When the distance between the access level and the floor of the platform in its access position exceeds 20 in. (0.5m), the aerial platform shall be equipped with an access ladder. The access system shall permit and, by proper placement of components, promote achievement of three point contact while ascending or descending the access system. The steps or rungs shall be divided equally over the distance between the first step or rung and the floor of the platform and shall not be more than 12 in. (0.30m) apart the height of the first step above the ground shall be a maximum of 20 in. (0.5m). Each step or rung shall be at least 12.5in. (0.32m) wide, at least 1.0in. (25mm) deep, and shall be slip resistant. The front steps or rungs shall be at least 6 in. (0.15m) horizontally away from the supporting structure or any other component of the aerial platform. The access ladder shall be symmetrical with the access opening.