Where piping systems serving appliances designed to
operate with a gas supply pressure greater than 14 inches
water column (3.5 kPa) are required to be equipped with
overpressure protection by Section 1208.9, each over-pressure protection device shall be adjusted to limit the gas pressure to each connected appliance as required by
the appliance manufacturer's installation instructions.
[NFPA 54:5.9.2.2]