Gas Line Bonding

Recently we have had lots of requests for gas line bonding. Many of our customer have questions regarding this, and why it wasn’t done when originally installed. Please read the following explanation to the most common questions.

Types of gas lines:
  • Black iron/galvanized pipe
  • Copper tubing
  • Flexible appliance connectors
  • Yellow corrugated stainless steel tubing (CSST)
  • Black (conductive jacketed) CSST products

CSST is a type of gas line home inspectors are looking for to check for proper bonding.

CSST stands for Corrugated Stainless Steel Tubing, important for proper gas line bonding

CSST stands for Corrugated Stainless Steel Tubing
If your gas piping system was installed or modified since 1990 (including installation of new gas appliances)  it’s likely that CSST was installed.
After several fires and reports of damage were recorded from CSST use the National Electrical Code (NEC) has added a new section requiring the gas line be directly bonded to the home’s service grounded conductor.
CSST manufacturers have performed extensive testing analysis on direct bonding which demonstrates a significant reduction in the potential for damage to CSST when lightning strikes occur. All CSST manufacturers now recommend the direct bonding of CSST to the house electrical system ground using 6 AWG copper wire or equivalent.


Here is a brief timeline of CSST’s existence

  • 1990 – CSST launch in U.S. market
  • 2000’s – Reports of lightning damage evaluated
  • 2006 – All manufacturer’s instructions now require bonding of yellow CSST
  • 2009 – Gas codes upgraded, requiring direct bonding of CSST
  • 2011- NFPA 70 National Electric Code added CSST bonding reference

2011 NEC code now directly refers to the bonding of CSST in section 250.104 (B)

Gas Line Bonding Services in Apex, Cary, Holly Springs, and Raleigh areas.

If you feel you have CSST gas line that is not correctly bonded or not bonded at all please call us and we will schedule a licensed electrician to come out and make sure your home is safe and properly bonded. If you are uncertain please call us for a consultation.
(919) 888-3500