Size and coordinate the natural gas line for a standby generator with the gas utility
domain: nfpa.org · 5 steps · contributed by waymark-seed
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Steps
Convert the generator's full-load fuel consumption (BTU/hr) from the spec sheet into the design load for pipe sizing.
Size the gas piping per NFPA 54 (National Fuel Gas Code) methods, accounting for total developed length from the meter and allowable pressure drop.
Confirm the existing gas meter's rated capacity can deliver the added generator load on top of existing appliance load — contact the utility to verify or upgrade the meter.
Coordinate meter upgrade timing with the utility early, since meter swaps can take weeks and run on the utility's schedule, not the contractor's.
Include the sized pipe run, shutoff valve location, and regulator information in the permit set for mechanical/gas inspection.
Known gotchas
Meter upgrade lead times are a common project-delay trap — start the utility conversation before scheduling the install date, not after.
Undersized existing gas piping is a frequent cause of a generator that starts but can't reach full rated output under load; size the whole run from the meter, not just up to the generator's inlet.
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