Final answer:
The question asks for the minimum size copper wire for a bonding jumper in a CSST gas piping system, but specific details from the relevant codes or standards are needed to provide an accurate answer.
Step-by-step explanation:
The question pertains to the sizing of a bonding jumper for a Corrugated Stainless Steel Tubing (CSST) gas piping system. In the context of electrical installations, bonding is essential to ensure a safe path for electrical current in the event of a fault. It's important to use the correct size of wire for this type of bonding to maintain system integrity and comply with safety standards.
Unfortunately, the question does not provide the necessary information from the National Electrical Code (NEC) or other relevant standards that specify the minimum size required for a bonding jumper, which is typically dependent on the size of the electrical service entrance conductors and other system characteristics. It's advisable to consult the latest code or a qualified electrician to get the precise answer for this situation.