What consideration must be given when testing with appliances designed for equal or greater pressures?

When testing with appliances designed for equal or greater pressures, it is essential to close the shutoff valves. This action ensures that the system is safe and prevents any accidental release of pressurized substances during the testing process. By closing the shutoff valves, the integrity of the testing environment is maintained, reducing the risk of hazards such as explosions or leaks.

Properly managing shutoff valves is a critical aspect of safety protocols in handling appliances that operate under high pressure. It allows technicians to control the environment effectively, ensuring that any tests conducted yield accurate results without undue risk. This is why the choice focusing on the need to close shutoff valves is deemed the most appropriate consideration when dealing with this scenario.