How is gas piping considered to be bonded?

Bonding in gas piping systems is essential for safety and preventing electrical shock hazards. When gas piping is bonded by connecting it to grounded appliances, it helps create a low-resistance path for electrical fault currents. This is crucial in ensuring that any stray voltage or electrical fault in the system is safely directed to the ground, thereby reducing the risk of fire or explosions caused by electrical arcing.

Grounded appliances have their own grounding mechanisms, and when gas piping is connected to them, the metal components of the gas piping system become part of the electrical grounding system. This practice helps to equalize the electrical potential between the gas piping and the appliances, ensuring safety in the presence of an electrical fault.

The other options do not provide adequate bonding. Connecting gas piping to natural gas sources does not inherently establish an electrical bond. Insulated couplings would actually inhibit electrical continuity rather than promote it. Utilizing metal conduits could potentially provide a grounding path, but it would depend on specific installation practices and would not necessarily ensure that the gas piping itself is effectively bonded to the electrical ground as mandated by code requirements.