Is grounding the gas meter required?

DaveBowden

Senior Member
Location
St Petersburg FL
We are remodeling a house and the homeowner is having a natural gas "on demand" water heater installed. There is no gas on the property now. The heater is outside, there are no metal water pipes in the house, there are no other gas appliances nor any gas piping in the house. The gas meter will be about 5 feet from the heater and about 25 feet and on the other side of a door from the electric service. Since there is no gas inside the house, does the gas meter still require grounding?
 

augie47

Moderator
Staff member
Location
Tennessee
Occupation
State Electrical Inspector (Retired)
250.102(B)
(B) Other Metal Piping. If installed in or attached to a building or structure, a metal piping system(s), including gas piping, that is likely to become energized shall be bonded
 

wwhitney

Senior Member
Location
Berkeley, CA
Occupation
Retired
Gas piping will require bonding, but not the gas meter itself. In fact, unless you know the gas meter has a dielectric union on its inlet side (I know it has at least one dielectric union, not sure which side), bonding the gas meter could cause a problem.

Cheers, Wayne
 

Fred B

Senior Member
Location
Upstate, NY
Occupation
Electrician
Will usually make a bonding after the dielectric fitting near point of entry to building. That usually gets you close for water pipe bond as well. If Heater is nearer and no dielectric fitting that will make any required additional connection will bond there.
Does the heater have an electrical connection? If not I don't see how it is "likely to become energized". If it does have an electrical connection, then it is grounded/bonded by the EGC in the circuit serving the heater and nothing additional is required.
Have seen heaters with a flex gas connector, My understanding that this then would require additional bonding.
 

DaveBowden

Senior Member
Location
St Petersburg FL
The heater has a 3 prong flexible cord that plugs into an AF/GF protected WR receptacle for the igniter. There may be flexible gas pipe connected to the heater for the gas supply but no other metal pipe that I know of anywhere. The water pipes are all CPVC. The gas pipe, with a possible exception of a strap on the flex pipe, is not attached to the house.
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
If there is CSST piping coming from the meter then, IMO it needs to be bonded unless it is the special kind that doesn't need bonding, like ounterstrike
 

lazorko

Member
Location
Philadelphia
If there is CSST piping coming from the meter then, IMO it needs to be bonded unless it is the special kind that doesn't need bonding, like ounterstrike
I have seen problems (i.e., fire) when unbonded gas lines are energized. Years ago I got hauled in to my first subrogation meeting after a house fire from a leak in that “magical” CSST that doesn’t need bonding.



Never had I ever had to face the possibility that my work caused a fire (I couldn’t sleep for weeks, waiting for the meeting). In my own analysis formed over those sleepless nights, I realized how vulnerable CSST can be and later wrote a paper about the matter (too long to post here).



On site, the team my insurer hired to protect “our” interests and I had already figured out the cascade that led to the fire (nothing I had done). They advised me to stay quiet; eventually the other teams discovered what we knew, and we were dismissed from the rest of the proceeding, as I had no blame. My team erased their photos and notes and left.



In that meeting (that also included engineering representatives from the manufacturer of the CSST used), I realized how this procedure is used only to assign liability for damages, not to advertise potential dangers that we might easily fix.



Like me, the manufacturer was dismissed, but only because the party responsible for the “initiating” issue had been identified. Yet, all the claims made for the safety of that gas tubing were proved wrong in that meeting … and all the evidence of that, similarly erased.



It was an eye-opener for me.
 

mtnelect

HVAC & Electrical Contractor
Location
Southern California
Occupation
Contractor, C10 & C20 - Semi Retired
I also had a learning experience with the legal system, it took me five years to resolve a Mechanics Lien that I filed against a General Contractor for nonpayment. When the court day finally arrived, the attorney's settled in the hallway outside of the courtroom. I had five years of lost sleep !
 

mtnelect

HVAC & Electrical Contractor
Location
Southern California
Occupation
Contractor, C10 & C20 - Semi Retired
Southern California Gas Company
 

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mtnelect

HVAC & Electrical Contractor
Location
Southern California
Occupation
Contractor, C10 & C20 - Semi Retired
All manufacturers require a rigid gas connection from the main gas valve to the outside of the unit with a Drip Leg".
 

kwired

Electron manager
Location
NE Nebraska
All manufacturers require a rigid gas connection from the main gas valve to the outside of the unit with a Drip Leg".
Which means nothing to the electrician.

NEC says bonding of gas piping by the EGC of the supply circuit is sufficient. Electrician is done if he properly installs EGC with his wiring method.

Extra specifications may require a copper conductor for the EGC - that is above and beyond NEC and would not be code violation but rather breach of contract at the most.

If you have CSST piping that requires additional bonding, IMO that is the responsibility of the CSST installer to assure it gets done. If he wants the electrician to do so it has to be an agreement between them and not an automatic assumption that it is the electricians job to do it.
 

Eddie702

Licensed Electrician
Location
Western Massachusetts
Occupation
Electrician
As others have mentioned the 120 volt circuit that feeds the water heater will also bond the gas piping. That is all you need. If between the gas meter and the water heater you use CSST the CSST has to be bonded unless the CSST you use is approved for bonding as Dennis mentioned. Just have your electrician put a bonding jumper on the CSST if needed.
 

kwired

Electron manager
Location
NE Nebraska
As others have mentioned the 120 volt circuit that feeds the water heater will also bond the gas piping. That is all you need. If between the gas meter and the water heater you use CSST the CSST has to be bonded unless the CSST you use is approved for bonding as Dennis mentioned. Just have your electrician put a bonding jumper on the CSST if needed.
Just don't ask this electrician. Installing that bond wire is part of the CSST instructions. I am not a gas piping installer and have not fully read instructions. If you don't want to run a bond wire maybe you should run piping that doesn't require it.
 

Eddie702

Licensed Electrician
Location
Western Massachusetts
Occupation
Electrician
Just don't ask this electrician. Installing that bond wire is part of the CSST instructions. I am not a gas piping installer and have not fully read instructions. If you don't want to run a bond wire maybe you should run piping that doesn't require it.
CSST is junk and should not be used IMHO and I am a licensed gas fitter. You might as well run gas though seal tight. In fact seal tight is more substantial. The interior is nothing more than tin foil.
 

kwired

Electron manager
Location
NE Nebraska
CSST is junk and should not be used IMHO and I am a licensed gas fitter. You might as well run gas though seal tight. In fact seal tight is more substantial. The interior is nothing more than tin foil.
I kind of agree with you.

At very least I think it shouldn't be installed where subject to physical abuse, probably shouldn't really be exposed at all in most situations, maybe just short amount then transition to rigid piping at the most.

Have some guys that run it all over the place around here, some that mostly run rigid pipe where exposed and know of at least one that kind of went away from using it at all more recently.
 

kwired

Electron manager
Location
NE Nebraska
EMT vs RGS?
not really that good of comparison IMO. There is also even thicker rigid pipe which should be pretty similar to RGS that is also used for gas. CSST I'd guess is thinner than EMT Something with thickness of EMT I would be more comfortable with containing gas under pressure even though it is only a few inches of water column. They have used copper tubing for LP gas for years, and at tank pressure. This CSST is sort of like using a paper straw in comparison. The stainless may be harder metal but is thinner and likely more brittle than copper and would crack easier if you flex it too much.
 
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