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.
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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)