Guardrail systems used to meet the requirement of fall protection shall be constructed with a rail height of how many inches, plus or minus three inches?

Guardrail systems used to meet the requirement of fall protection shall be constructed with a rail height of how many inches, plus or minus three inches?

• A. 39 inches
• B. 42 inches
• C. 45 inches
• D. 48 inches

Answer: (B)

The key idea here is the required height of the guardrail top to provide effective fall protection. The standard specifies a top rail height of 42 inches above the walking surface, with a tolerance of plus or minus 3 inches. That means the acceptable range is 39 to 45 inches. The reason for this specification is to ensure the guardrail is tall enough to prevent falls for most workers while still being practical for different tasks and work surfaces. So the target height is 42 inches, with the allowable variation giving a range of 39–45 inches.

The key idea here is the required height of the guardrail top to provide effective fall protection. The standard specifies a top rail height of 42 inches above the walking surface, with a tolerance of plus or minus 3 inches. That means the acceptable range is 39 to 45 inches. The reason for this specification is to ensure the guardrail is tall enough to prevent falls for most workers while still being practical for different tasks and work surfaces. So the target height is 42 inches, with the allowable variation giving a range of 39–45 inches.