What height must a barrier be in certain installations according to the guidelines?

• A. 1 inch
• B. 2 inches
• C. 3 inches
• D. 4 inches

Answer: (B)

In these installations, there’s a minimum barrier height specified to ensure adequate protection and proper operation without interfering with mounting or servicing. The guideline sets 2 inches as that minimum. A barrier at this height is tall enough to deter tampering and provide the needed separation from the protected area, yet not so tall that it creates clearance issues or unnecessary bulk.

A 1-inch barrier would be too low to meet that protective intent, while a 3- or 4-inch barrier goes beyond the minimum and isn’t required by the standard, potentially complicating the setup without added benefit. So the recommended minimum height is 2 inches.