Which classification rating tests assemblies by placing them in pressurized water for 72 hours?

The classification rating that tests assemblies by placing them in pressurized water for 72 hours is known as the W rating. This stringent test evaluates the performance and durability of various assemblies when subjected to wet conditions, ensuring they can withstand extended exposure to water under pressure. This type of testing is crucial for applications where water ingress could compromise the integrity or functionality of the assembly, such as in telecommunications or data networking environments. Proper classifications ensure that installations meet safety and operational standards in real-world conditions, thereby protecting both equipment and users.