bonding gas line even though flex

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Stevenfyeager

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United States, Indiana
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electrical contractor
This new house has all flex propane gas lines except the last two feet exiting the house and two feet next to an inside junction distribution pipe. Those two sections are black iron. This state requires gas line bonding, but should I bond it to the service panels, even though it is almost entirely flex gas line ?
 
You can bond it at the service panel or connect to the grounding electrode conductor . Make sure you put the clamp on the black pipe or on a connector not the flex itself.

We usually go from the service panel to where the gas line enters the house since the gas lines(meter) are usually near the service. Don't connect to the line side of the gas meter
 
Thanks. It so happens that the black iron section at the gas junction is in the service panel room and close by. The other black iron exiting the house is at the far opposite end of the house, probably 60 feet away. Is it possible to bond to the close one ? Or does the flex make that not a bond ?
 
The idea is to assure that the incoming gas hard pipe (between meter and any flex in the house) is at the same potential as the appliance end(s) of any flex (already bonded by electrical supply circuit(s)).
 
Stevenfyeager said:
Thanks. It so happens that the black iron section at the gas junction is in the service panel room and close by. The other black iron exiting the house is at the far opposite end of the house, probably 60 feet away. Is it possible to bond to the close one ? Or does the flex make that not a bond ?
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You're correct: the flex between renders the inside section useless, but it would probably be a good idea to bond it on the way to the outside section.
 
LarryFine said:
The idea is to assure that the incoming gas hard pipe (between meter and any flex in the house) is at the same potential as the appliance end(s) of any flex (already bonded by electrical supply circuit(s)).
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The issue is with the CSST flexible gas piping that requires special bonding by rules that are not found in the NEC. Some brands of this type of product are very susceptible to pin holes from near by lighting strikes. The special bonding for this product was not added to the NEC because when such rules were submitted, the submitters could not convince CMP5 that the additional bonding would actually prevent the lightning damage.

The NEC rules do not require any additional bonding over the EGC that supplies a gas appliance that also has electric power. The metal to metal connection in the appliance between the gas pipe and the bonded metal of the appliance.
 
don_resqcapt19 said:
The issue is with the CSST flexible gas piping that requires special bonding by rules that are not found in the NEC. Some brands of this type of product are very susceptible to pin holes from near by lighting strikes. The special bonding for this product was not added to the NEC because when such rules were submitted, the submitters could not convince CMP5 that the additional bonding would actually prevent the lightning damage.

The NEC rules do not require any additional bonding over the EGC that supplies a gas appliance that also has electric power. The metal to metal connection in the appliance between the gas pipe and the bonded metal of the appliance.
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So Don have you heard of any fires where the bonding of CSST was bonded? It seems like we heard about so many instances before and I have not heard of one fire since the bonding got moving.
 
Dennis Alwon said:
So Don have you heard of any fires where the bonding of CSST was bonded? It seems like we heard about so many instances before and I have not heard of one fire since the bonding got moving.
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Yes there have been some since the bonding started, but not as many as before the bonding started.
The original safety investigation report on this product said it really should not be permitted as there is no safe way to install it.
The following is from the Standard Council upholding the NEC decision not to include the CSST bonding in the NEC.
Technical Substantiation.
On the technical lightning safety issues surrounding CSST, the CSST Task Group reported that it had sought information on the research that supports the current CSST bonding requirements of NFPA 54, including any research performed by or on behalf of any manufacturers. The reports received were of limited value and as stated in the CSST Task Group report provided to the Council "did not provide enough information for the CSST Task Group to ascertain that the proposed bonding remedy will provide adequate protection from lightning induced surges.” In addition, the CSST Task Group noted limited anecdotal reports concerning failures where the bonding of the installation may have complied with the current edition of NFPA 54. The CSST Task Group cautioned that the lack of detailed information or incident reports made assessment of these anecdotes impossible.
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