This article was posted 11/21/2008 and is most likely outdated.

CSST Gas Pipe Bonding
 

 

Topic - Grounding vs Bonding
Subject - CSST Gas Pipe Bonding

November 21, 2008
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CSST Gas Pipe Bonding

 

ImageCSST - Corrugated Stainless Steel Tubing has been sold and installed In the US since 1988. As a result of legal actions stemming from the physical damage of lightning strikes manufacturers have agreed to new installation requirements regarding the bonding of CSST systems to the main grounding electrode of the structure were the CSST is installed.

 

Click here to review a study and some history of lightning strikes and CSST. At the current time Sangamon County is requiring that the gas line be bonded on non-metalic gas services at the entry into the home where a rigid nipple comes off the meter. A #6 solid is then required to be taken to the main grounding electrode of the structure. To my knowledge at this time no testing lab is listing a grounding clamp made to attach to the connector of the CSST. The gas and electric codes have not addressed this situation as of yet. – Michael Ashenfelter (Electrical/Mechanical Inspector)

 

Some additional information concerning the grounding clamps that might be used for bonding purposes provided by Donald Shields with UL: Currently, UL category KDER pg 172 in the 2007 White Book is the correct item for bonding of metallic piping. However, these products have only been evaluated for the connection to the round surface contours of pipe.


They have not been evaluated by UL  for any flat or shaped surfaces such as the HEX Fittings of a plumbing union or CSST connector. This could require the use and application of a short pipe nipple for the bonding connection to the CSST product or any surface that is not round.

Hopefully this information will help prevent any misuse of products listed by UL under the KDER category.

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Comments
  • As I understand this issue, it is a requirement for the installation of the CSST product and not a electric code requirement. My experience with my local jurisdictions has been that they don't know what to do with this, because it is a manufacturers specification and should fall under the inspection of the gas line installation and not the electrician since requirements can vary by each manufacturer. My fear of liability puts me in the position of not doing anything to the CSST system until I receive specifications in writing for each project requiring me to bond to it.

    Jim Hurst
    Reply to this comment

  • In my previous comment I stated grounded, when it should be, the csst needs to bonded to the electrical system.

    Guy W Opie
    Reply to this comment

  • According to Army Technical Manual 5-690 a stainless steel hose clamp makes for an excellent grounding and bonding connector when nothing else is available or where a conventional grounding connector would crush or perforate a waveguide, coaxial cable, or just about any kind of tubing.

    An instance where this would be useful would be when bonding a thinwall chrome plated sink trap and the water shutoff valves to each other and the local branch circuit to get rid of a tingle voltage. David Eli Shapiro one time encountered an instance where electricity was crawling up the moisture inside of a plastic drain pipe creating a nasty tingle voltage in a shower. How this can happen is that I have done some consulting for a mobile home park that has grass and tree roots that are penetrating the o-ring joints of gasketed PVC sewer pipe. Sooner or later sanitary engineers will have to specify that o-ring joints be wrapped with copper foil or some other deterrent to plant roots.

    Now I am realizing that electricians be trained to do plumbing in general not only to be good at running pipe in general and conduit in particular but also to understand what somebody else's problems and issues are. In return, we also need to be training plumbers how to use pipe benders which would solve some of their problems.

    Michael R. Cole
    Reply to this comment

  • Washington electrical rules that will be effective Dec 31, 2008 will require bonding of CSST. I recall from Mikes GVB video that Scott Harding brought up the issue of CSST bonding and the CMP didn't want to address it. Washington says bond per manufacturers requirements.

    Tom Baker
    Reply to this comment


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