What is the required method for bonding conductors?

• A. Must always be twisted
• B. Must always be insulated
• C. Must be terminated with compression fittings
• D. Must always be soldered

Answer: (D)

Bonding conductors aims to create a permanent, low-resistance electrical path between the metal gas piping and the building’s grounding system so that any potential difference is quickly equalized. Soldering the bonding conductor provides a continuous metal-to-metal connection that remains solid over time, resisting loosening from vibration, thermal cycling, or corrosion. This durability helps guarantee a reliable bond under various conditions, which is why soldering is the preferred method in this context. Other approaches like twisting wires, leaving conductors insulated, or relying on compression fittings alone do not guarantee a continuous, low-impedance path and can degrade or disconnect, defeating the purpose of bonding.