True or False: Gas lines must be bonded to the grounding system if they might become energized.

Gas lines must be bonded to the grounding system to ensure safety in the event that they become energized. Bonding provides a low-resistance path for electrical current, which minimizes the risk of shock or fire from stray electrical currents that could inadvertently energize metallic gas piping. This is especially important if there are metal components in the gas line that could conduct electricity.

The requirement applies regardless of whether the system is new or existing, ensuring that any metallic gas line is adequately protected. This is a widely accepted safety practice adopted in electrical codes to mitigate potential hazards associated with electric shock.

Some of the other options would not universally apply; for instance, bonding is not limited to new constructions or solely based on whether the pipe is metallic. The principle is to ensure safety against electrical hazards for any gas line that could pose a danger if energized.