• Bonding ensures that metal gas piping is electrically connected to the grounding system to prevent potential voltage differences.
• Grounding typically refers to connecting electrical systems to earth — but for gas pipes, inspectors are looking for bonding.

✅ How to Bond a Gas Pipe System (Per NEC 250.104(B))

• Use a listed bonding clamp: Secure it to a metallic portion of the gas pipe (not flexible connectors).
• Connect with a copper conductor: Usually #6 AWG copper is sufficient, but check with your AHJ (Authority Having Jurisdiction).
• Terminate at the grounding electrode system: This could be the ground rod, water pipe electrode, or the panel’s grounding bar.
• Avoid CSST unless it’s listed for bonding: If you’re using Corrugated Stainless Steel Tubing, it must be bonded per manufacturer specs — often with a special bonding clamp.

According to the Alabama Public Service Commission’s Gas Pipeline Safety Division, inspections focus on:

• Proper bonding of metallic gas piping
• Compliance with NFPA 54 and NEC
• Use of approved materials and methods
• Clear labeling and accessibility of bonding connections
• Diagrams of Proper Gas Pipe Bonding
• Here are some helpful examples:
• Bonding CSST with grounding electrode connection — shows the bonding jumper from the CSST to the grounding electrode system.
• Common bonding locations on rigid gas piping — includes examples of bonding clamps and conductor routing.
• Flexible gas piping bonding overview — highlights bonding requirements for flexible systems like HOME-FLEX.
• Electrical bonding of CSST per IRC and IFGC — includes code references and jumper sizing.
• Primary Codes for Gas Pipe Bonding
• NEC 250.104(B) – Bonding of Piping Systems
• Requires bonding of metal piping systems that are likely to become energized.
• Includes gas piping, medical gas, vacuum, and compressed air lines.
• Bonding must connect to the grounding electrode system to ensure overcurrent protection can trip if needed.
• NFPA 54 – National Fuel Gas Code
• States that CSST (Corrugated Stainless Steel Tubing) must be bonded to the electrical service grounding electrode system.
• Bonding should occur where the gas service enters the building.
• Appliances connected to grounded circuits may provide bonding, but this alone is not sufficient for CSST.
• IRC Section G2411 (310) – Electrical Bonding
• Applies to residential installations.
• Requires bonding of metal gas piping that’s likely to become energized.
• Clarifies that appliance grounding conductors may bond rigid piping, but CSST needs dedicated bonding.
• Emphasizes equipotential bonding to eliminate voltage differences between systems.
• Manufacturer Requirements
• CSST manufacturers (like HOME-FLEX, Gastite, TracPipe) often require:
• #6 AWG copper bonding jumper
• Listed bonding clamp
• Connection to the grounding electrode system
• These requirements may exceed code minimums, so always check the installation manual.