Interconnection to a gas line for lightning protection must be made on which side of the gas meter?

The correct choice to interconnect to a gas line for lightning protection is on the customer side of the gas meter. This is crucial because the gas meter acts as a barrier separating the utility's infrastructure from the customer's equipment. By connecting on the customer side, you ensure that the lightning protection system is not interfering with the utility's operations and that it does not create a potential hazard back into the utility's system. This positioning also provides better safety, as it minimizes the risk of creating a situation where lightning could cause a surge that travels toward the gas supply infrastructure controlled by the utility, potentially leading to dangerous consequences.

In scenarios where connections are made on the utility side, it could expose the utility infrastructure to surges that may not be able to be effectively managed or mitigated. Hence, the safe practice is to always make connections for lightning protection on the customer side of the meter.