When can a plumbing system be covered?

A plumbing system can be covered only after it has been tested, inspected, and approved to ensure that it meets all required codes and standards. This step is critical because it verifies that the installation is free of leaks and defects, operates correctly, and complies with health and safety regulations. Covering the system prematurely could lead to complications that are difficult to address, such as undetected leaks or code violations that might require significant effort to rectify later on.

The other options indicate steps that might be necessary in the process of installation or maintenance, but they do not provide the assurances needed to protect both the integrity of the plumbing system and the safety of the individuals using it. For instance, merely completing an installation or cleaning the system doesn’t guarantee its functionality or compliance, and while documentation is vital for record-keeping and verification, it should coincide with prior approval from inspections to ensure safety and reliability.