Wrong Code, check out the lightning protection and the fuel gas Codes.Saw a bonding strap from a metal gas line to a nearby ground wire from a lightnng protection system. Cant find anything in NEC.
This is also required by the Fuel Gas Code. The common interpretation of this is that if any gas appliance has electrical power to it, then the gas piping is likely to become energized. In most cases a separate bonding conductor will not be required as the appliance EGC will be mechanically bonded to the gas pipe at the appliance, but the result is that the gas piping is bonded to the electrical grounding system. The wording that was in the '99 code as 250-104(b) was a direct quote from the Fuel Gas Code and it appears that the Fuel Gas Code always requires that the gas piping be bonded, even where not connected to an appliance requiring electrical power.250.104(B) Other Metal Piping. Where installed in or attached to a building or structure, metal piping system(s), including gas piping, that may 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 to 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 may energize the piping system(s). The equipment grounding conductor for the circuit that may energize the piping shall be permitted to serve as the bonding means. The points of attachment of the bonding jumper(s) shall be accessible.
Just so you know....the NFPA-54 (National Fuel Gas Code) Committee has issued a Formal Interpretation of the NFPA-54, 3.14(a) which pertains to NEC 250-104 and electrical bonding of gas pipe. I attended the NFPA-54 Meeting in San Antonio, Texas (end of February) and was asked to speak on this issue. I did so and so did Ted Limoff of NFPA Staff.
The statement of issue and question asked were:
NEC 250-104(b) states: "Each aboveground portion of a gas piping system upstream of the equipment shutoff valve shall be electrically continuous and bonded to the grounding electrode system."
"Is it the intent of NFPA-54, 3.14 (a) and NEC 250-140(b) (metal gas piping), to consider this bonding requirement to be satisfied where a grounded gas appliance is attached to the metal gas piping system?"
The answer was: "Yes"
The intent expressed by the Committee is that when connected to grounded equipment (e.g. equipment connected to an equipment grounding conductor) the pipe is considered bonded.
I was asked to keep the NFPA-54 Committee appraised of this issue, informed if further clarifications were considered needed, and asked to kept them informed of Panel 5 Actions pending on Proposals 5-64 & 5-65 (removal of the phrase "likely to be energized") or which I intend to send in a Comment to Reject. I believe in the zeal of grounding and bonding, Panel 5 is, unfortunately, and unwittingly creating safety issues and concerns for systems regarding which they have limited exposure and knowledge.
John Beck
Pacific Gas and Electric Co.
Chairman CMP-4
"250.104(B) Other Metal Piping. Where installed in or attached to a building or structure, metal piping system(s), including gas piping, that may become energized shall be bonded . . ."from what i see nec article 250.104(B) states that gas piping shallbe bonded to the service equipment