Which of the following items is NOT required for safety when performing work on metallic piping systems?

The reason "Electric switches that can be operated" is not required for safety when performing work on metallic piping systems is because the primary concern in such situations is ensuring the safety of the work area in relation to the piping system itself, rather than controlling electricity. While it is important to handle any electrical components safely, the requirement is typically focused on isolating power sources and ensuring proper grounding rather than having operable electric switches.

In contrast, the use of proper cutting tools is a fundamental safety requirement to prevent injuries while working on metallic piping. A metallic electrical bond is crucial to prevent static electricity buildup and to ensure proper grounding. Finally, using safety-type flashlights specifically designed for hazardous environments is vital to reduce risks associated with potential ignition sources while working in areas where flammable vapors may be present, adhering to safety protocols.