Which term describes an enclosure that prevents moisture from entering under specified test conditions?

The term that describes an enclosure designed to prevent moisture from entering under specified test conditions is watertight. This designation implies that the enclosure has undergone specific testing to ensure it can resist water penetration, affirming its performance under defined conditions, such as exposure to water.

Watertight enclosures are utilized in various applications to protect sensitive electronic components and devices from water damage. This is particularly crucial in environments where there is a high likelihood of water exposure, such as in marine equipment or outdoor installations.

While weatherproof enclosures are designed to withstand a variety of environmental factors, including rain and wind, they may not necessarily be tested for absolute water resistance. Raintight refers specifically to protection against rain exposure, but it may not indicate complete water resistance as seen in watertight options. Dustproof pertains to an enclosure's ability to prevent dust ingress but does not account for moisture, making that term distinct from watertight.

In conclusion, the specific term "watertight" correctly identifies enclosures that maintain integrity against moisture ingress under controlled conditions, highlighting its importance in safeguarding electronic equipment from potential water-related issues.