Audible and visual alarm indicators shall have a minimum size of which of the following?

• A. DN20 size
• B. DN15 size
• C. DN25 size
• D. DN32 size

Answer: (A)

The test is checking the minimum size needed so audible and visual alarms are easily noticed in a busy clinical setting. The required minimum is twenty millimeters in diameter, which makes the alarm indicator readable from a practical distance and stands out against the surrounding equipment and lighting. Since the question asks for the minimum size, twenty millimeters meets the standard; smaller sizes would not satisfy it, while larger sizes would also comply but aren’t necessary to meet the minimum requirement.