Final answer:
In pantograph inspections, the lighting system is not required to be attached to the pantograph with a cable to prevent FOD; safety features like warning flags, an emergency stop button, and a grounding strap are typically attached.
Step-by-step explanation:
When inspecting a pantograph, the item not required to be attached to the pantograph with a cable to eliminate foreign object damage (FOD) is the lighting system. A pantograph is a mechanism for maintaining contact with an overhead power supply, typically used on trains and trams. The other options, such as warning flags, an emergency stop button, and a grounding strap, are safety features that are primarily concerned with the safety of personnel and the equipment. The warning flags serve as a visual alert, the emergency stop button is a safety control feature, and the grounding strap is essential for electrical safety to prevent static discharges or electrical shock. However, a lighting system is generally not attached directly to the pantograph with a cable; instead, it is part of the vehicle's overall electrical system.