Question

the top rail of a guardrail must be between inches and inches tall.

Explanation:

Identify the regulatory standard

Using the OSHA Fall Protection and Fall Protection Systems knowledge points, we reference the standard for guardrail heights. Under OSHA standard 29 CFR 1910.29(b)(1) and 1926.502(b)(1), the top edge height of top rails must be 42 inches plus or minus 3 inches above the walking-working level.

Determine the height range

Using the Fall Protection Systems knowledge point, we calculate the acceptable range:

$$ 42 - 3 = 39\text{ inches} $$

$$ 42 + 3 = 45\text{ inches} $$

Thus, the top rail must be between 39 and 45 inches tall.

Answer:

The top rail of a guardrail must be between <blank>39</blank> inches and <blank>45</blank> inches tall.