Guardrail systems must have a rail height of

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Multiple Choice

Guardrail systems must have a rail height of

Explanation:
Guardrails are a safety barrier to prevent falls from elevated work surfaces. The top edge needs to be high enough to stop a person from slipping over during normal movement, while still being practical to grasp. The standard height for the top rail is 42 inches above the walking/working surface, with a small allowable variation around that height (roughly 39–45 inches). Among the options, 42 inches matches this requirement. A lower height would offer less protection, a higher height is not necessary for typical work, and 30 inches would be far too low to prevent falls.

Guardrails are a safety barrier to prevent falls from elevated work surfaces. The top edge needs to be high enough to stop a person from slipping over during normal movement, while still being practical to grasp. The standard height for the top rail is 42 inches above the walking/working surface, with a small allowable variation around that height (roughly 39–45 inches). Among the options, 42 inches matches this requirement. A lower height would offer less protection, a higher height is not necessary for typical work, and 30 inches would be far too low to prevent falls.

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