In Calif.-So. Calif. Gas Co. territory: "The Gas Company" says NO don't bond to our stuff, even within the building. As of about three years ago, that statement changed because "The Gas Company" said, we are now using a dielectric fitting on new installations; you may bond the building gas piping. So, we bond.
Usually it's at the water heater: one Bonding Jumper from the ground bar to Gas , CW, HW in one convenient and accessible location.
Oh yeah, Any new foundations in conjunction with a new or upgrade service, even in an addition, then we get a UFER.
