Thread: CSST Product?

Is this CSST? It was run from a black gas pipe in the basement about
10' up to a kitchen gas shut off, and then to the range.
It was not bonded and I belive it should be.

Comments.....

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yes, that is csst.

It probably has a bond via the gas valve mounting inside the appliance but it needs what is called an additional bond.

Thanks Bruce. This is the illustration I usually include
when it is not "bonded".

Originally Posted by Rich Sumen

Thanks Bruce. This is the illustration I usually include
when it is not "bonded".

Where did the picture come from?

I disagree with it.

The connection should not be made to a water pipe since the actual quality of its bonding is unknown without technical testing.

It needs to be made to the existing ground rod or at least to the bus bar where the GEC connects.

Also, the clamp typically just goes around the black iron pipe instead of the brass nut.

I thought the bond had to be where the steel gas lines leaves the gas meter and run back to the service panel.

I got it from one of the mfgs web sites.
It should be find to the main water pipe, at it is used in most homes as
the secondary grounding point. This buss is also fine. The clamp must
go on the CSST nut according to the mfgs.

Here is some more info shown below.
I am clear that the CSST should be clamped "bonded" at the "start point" of the CSST connection to the black pipe, (The nut appears to be the way to go", but where should the bonding wire run to, is what I'm unclear on.
It looks like the main panel ground buss, is one way. If a main water pipe is the homes secondary ground, That should be OK also. Unless I'm reading this wrong.
---------------------------------------------------------
The 2009 edition of NFPA 54, National Fuel Gas Code, includes new requirements for bonding CSST gas piping systems to the grounding conductor of the building's electrical system, to reduce the possibility of damage by lightning strikes by reducing the electrical potential between metallic objects and building systems, including gas distribution.

"7.13.2 CSST. CSST gas piping systems shall be bonded to the electrical service grounding electrode system at the point where the gas service enters the building. The bonding jumper shall not be smaller than 6 AWG copper wire or equivalent."

"7.13.3 Prohibited Use. Gas piping shall not be used as a grounding conductor or electrode. This does not preclude the bonding of metallic piping to a grounding system."

"7.13.4* Lightning Protection Systems. Where a lightning protection system is installed, the bonding of the gas piping shall be in accordance with NFPA 780, Standard for the Installation of Lightning Protection Systems."

Bonding a CSST gas distribution system requires cooperation between the installer of the system, the electrician, and the installer of the lightning protection system if the building has one.

Instructions and other literature from CSST manufacturers now include these bonding requirements from NFPA 54. Several manufacturers also recommend the upgrading of existing CSST systems to include the required bonding.


Approved methods of bonding require the installation of a UL-listed ground clamp:

• on the black steel gas pipe where it enters the building; or
• on the manifold connecting the black steel gas pipe to multiple runs of CSST; or
• on the brass fitting connecting each run of CSST to a manifold.
  The bonding conductor must be 6-gauge or larger copper wire, solid or stranded, connected to the terminal on the UL-listed ground clamp. The bonding conductor must be continuous, with the other end connected to

The steel enclosure of the electrical service equipment; or

• The grounded conductor at the electrical service; or
• The grounding electrode conductor (if it is large enough) between the service equipment and the grounding electrode(s); or
• One or more of the grounding electrodes ("ground rods") for the electrical system.
  The CSST must be bonded only at the end nearest the entry of the gas service into the building. If it is bonded at both ends, or at the end nearest the gas-burning appliance, the CSST may carry stray electrical currents or act as a grounding conductor, which can damage the CSST and its fittings, and cause leaks.