International Association
Electrical Inspectors


Bonding Concerns with
Flexible Metal Gas Piping

There have been lawsuits due to fires with CSST gas piping systems and the major concern is the proper bonding of these systems and lightning. Manufacturers have issued a Installation Instructions andTechnical Bulletins that requires bonding in excess of current NEC requirements.

CSST - Corrugated Stainless Steel Tubing
View the Manufacturers Instructions or Bulletins

Gastite . . . TracPipe . . . ParFlex

Tru-Flex . . . Diamondback . . . WardFlex

What is CSST?

CSST is used to transmit gas in residential, commercial and industrial structures. CSST consists of a continuous, flexible, stainless steel pipe, and typically is covered with a yellow exterior plastic coating. In the case of one of the products manufactured by OmegaFlex, called “COUNTERSTRIKE,” the product is covered with a black exterior coating with yellow lettering. CSST typically is routed beneath, through and alongside floor joists, inside interior wall cavities and on top of ceiling joists in attic space from a gas source to an appliance. CSST does not include gas-appliance connectors (e.g.,a connector that runs from a gas outlet to an appliance).

There are four manufacturers listed in the lawsuit.

NAHB Research Center has produced a great article dated August 2007 regarding CSST entitled:

"Corrugated Stainless Steel Tubing for Fuel Gas Distribution
in Buildings and Concerns over Lightning Strikes"

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CSST is required by the manufactured to be bonded based on the manufacturers installation instructions or a manufacturers technical bulletin. Be sure to check out the information.


2008 Michigan Electrical Code has been adopted and becomes effective on December 2, 2009.
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