The gas utilities have used dielectric fittings between the building piping and the underground piping for at least 40 years in this area. I thought that all gas utilities isolated their underground distribution from the building piping, but apparently not. In this area, it is no longer any type of problem as all of the gas underground distribution up to 800 psi is nonmetallic pipe.
As far as an actual bonding connection, many code authorities agree that the mechinical connections on a gas appliance that has electric power is a sufficient bond to comply wiht 250.104(B). In some cases the mechinical connection may be good enough, but on other appliances a bond directly to the gas pipe would be required. This should be addressed by CMP 5 as the wording in the current code does not clearly require an actual bond to the pipe.
Don
