Grounding a gas line

[don_resqcapt19]

(B) Other Metal Piping. Where 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 to the service equipment enclosure, the grounded conductor at the service, the grounding electrode conductor where of sufficient size, or the one or more grounding electrodes used. The bonding jumper(s) shall be sized in accordance with 250.122, using the rating of the circuit that is likely to energize the piping system(s). The equipment grounding conductor for the circuit that is likely to energize the piping shall be permitted to serve as the bonding means. The points of attachment of the bonding jumper(s) shall be accessible.

 

[discusted electrician]

gas piping ground

gas piping ground

the mdp that supplys power to the facility that i work at is located 500 feet from where the gas line comes up through the ground and goes out through the facility ending at various locations for different heating applications. their is no bonding at any of the locations (from egc) to the iron pipe or at the source from where it originates from the ground to inside the building. code implies table 250.66 but their is no way for me to get a ground wire from the mdp over to it and since the previous electricians used the conduit as a means of grounding and over a span of 30 years much of the conduit has come loose from coupling, connector, etc, using a bonding bushing on the conduit and then running a bond on over to the pipe is useless. the gas line was put in 1981 and i don't no if it is csst. does the code require the gas pipe to be bonded at all?

 

[Dennis Alwon]

the mdp that supplys power to the facility that i work at is located 500 feet from where the gas line comes up through the ground and goes out through the facility ending at various locations for different heating applications. their is no bonding at any of the locations (from egc) to the iron pipe or at the source from where it originates from the ground to inside the building. code implies table 250.66 but their is no way for me to get a ground wire from the mdp over to it and since the previous electricians used the conduit as a means of grounding and over a span of 30 years much of the conduit has come loose from coupling, connector, etc, using a bonding bushing on the conduit and then running a bond on over to the pipe is useless. the gas line was put in 1981 and i don't no if it is csst. does the code require the gas pipe to be bonded at all?

T. 250.66 deals with GEC not EGC. If there is a gas furnace or gas equipment that is fed with power then the EGC will automatically bond the gas piping.

Are you sure there is no power installed to any point on the gas line?

 

[discusted electrician]

not if the egc is the metal raceway and and over a perod have time has become loose in the coupling, connector, etc. so their is no continued continuity and you have no egc.

 

[hillbilly]

not if the egc is the metal raceway and and over a perod have time has become loose in the coupling, connector, etc. so their is no continued continuity and you have no egc.

I do believe that I would correct that problem .

steve

 

[don_resqcapt19]

the mdp that supplys power to the facility that i work at is located 500 feet from where the gas line comes up through the ground and goes out through the facility ending at various locations for different heating applications.

If there is no dielectric union or other isolation method at the point where the gas piping enters the building, a bonding connection to the gas pipe would be using the metal underground gas piping as a grounding electrode in violation of 250.52(B)(1).

...but their is no way for me to get a ground wire from the mdp over to it and since the previous electricians used the conduit as a means of grounding and over a span of 30 years much of the conduit has come loose from coupling, connector, etc, using a bonding bushing on the conduit and then running a bond on over to the pipe is useless.

If that is the case then the conduit was not properly installed and supported.

... the gas line was put in 1981 and i don't no if it is csst.

I don't think CSST existed at that time and it is not the type of installation that you would see in an industrial installation.

... does the code require the gas pipe to be bonded at all?

If there is no gas fired equipment that uses electric power it is unlikely for the gas piping to become energized and the code rule does not require gas piping that is not likely to become energized to be bonded.

 

[iwire]

I still want to know how we prevent a bonded gas line from behaving as an electrode.

IMO there is no reason we have to 'prevent it' we just can not count it as an electrode.

If the house had no uffer or metal water pipe but did have a steel gas line we could not use it as the electrode. We would have to add electrodes.