Scaffolding Erection and Inspection Flashcards

According to OSHA, who is responsible for inspecting a scaffold and its components for visible defects before each work shift?

Answer: A competent person

OSHA standard 1926.451(f)(3) requires that scaffolds and scaffold components be inspected for visible defects by a competent person before each work shift and after any occurrence which could affect a scaffold's structural integrity. This ensures the scaffold remains safe for use throughout the day.

What is the minimum height requirement for the top rail of a guardrail system on a supported scaffold?

Answer: Between 38 and 45 inches

Per OSHA 1926.451(g)(4)(ii), the top edge height of toprails or equivalent members on supported scaffolds must be installed between 38 inches and 45 inches above the platform surface. This height range is critical for providing effective fall protection for workers on the platform.

When scaffold planks are overlapped to create a long platform, what is the minimum overlap distance required over the supports?

Answer: 12 inches

OSHA 1926.451(b)(5)(i) specifies that when platforms are overlapped to create a long platform, the overlap shall occur only over supports and shall not be less than 12 inches unless the platforms are nailed together or otherwise restrained to prevent movement. This prevents the planks from slipping and creating a fall hazard.

What is the minimum clearance distance that must be maintained between a scaffold and an insulated power line of less than 300 volts?

Answer: 3 feet

OSHA 1926.451(f)(6) requires a minimum clearance of 3 feet for insulated power lines of less than 300 volts. For uninsulated lines or lines with higher voltages, the clearance distance increases significantly. Maintaining this distance is crucial to prevent electrocution.

Supported scaffold poles, legs, posts, frames, and uprights must bear on which of the following?

Answer: Base plates and mud sills

According to OSHA 1926.451(c)(2), supported scaffold poles and frames must bear on base plates and mud sills or other adequate firm foundations. This ensures that the weight of the scaffold and its load is distributed evenly and prevents the scaffold from shifting or sinking into the ground.

Under OSHA regulations, when is it permissible to use scaffold cross-bracing as a means of access?

Answer: It is never permissible

OSHA standard 1926.451(e)(1) explicitly states that cross-braces shall not be used as a means of access. This is because they are not designed to support a person's weight in the same way as a ladder or stair, and using them for access can lead to slips and falls.