What maintenance step is critical before starting any work on a water system?

Isolating and draining the system before starting any work on a water system is a critical maintenance step because it ensures the safety of personnel and prevents potential hazards. When working on water systems, there is a risk of exposure to pressurized water, which can lead to serious injuries. By isolating the system, you effectively eliminate the water pressure and any associated risks, ensuring that the environment is safe for maintenance activities.

Draining the system further ensures that there is no standing water, which can cause issues such as flooding, contamination, and difficulties when accessing various components. This step is a fundamental safety protocol in many maintenance practices, emphasizing the importance of safeguarding both the workers and the infrastructure involved in the water system.