The bonding jumper shall be connected to the gas piping system with a bonding clamp that is listed for the material of the bonding jumper and for the material of the component of the gas piping system to which the bonding clamp is attached. The bonding clamp shall be attached to the gas piping system, on the downstream side of the gas meter or regulator, in an unconcealed and readily accessible space. The bonding clamp shall be attached to a segment of metallic fuel gas pipe which (a) is a component of the gas piping system, (b) is electrically continuous with all CSST components of the gas piping system, (c) is made of steel, wrought-iron, copper (if permitted by Section 403.4.3 of this code), or brass (if permitted by Section 403.4.3 of this code), or aluminum, (d) complies with the applicable provisions of Section 403.4 of this code and with all other applicable provisions of Section 403 of this code, and (e) is not less than 3 inches (76 mm) in length. Neither the CSST nor the brass hexagonal nut on the CSST fitting shall be used as an attachment point for the bonding clamp.