A dual fuel gas system for a natural gas emergency generator is not a requirement. It is an option. An onsite fuel supply is the requirement. Natural gas may be used if automatic change-over to an alternate on-site fuel system is provided.
Although we think of natural gas as reliable, it is poor fuel for an engine on a backup (or emergency) generator. NG is subject to contamination, loss of pressure, and interruption. A gas burner may tolerate these issues, while an engine is more demanding and may not operate at all if the NG supply is less than perfect.
For a better explanation view the video.
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