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.
Generator Inspection Checklist
You may have many questions regarding your standby power system. This checklist will walk you through all the steps of proper maintenance for commercial emergency generators as well as keeping in all proper codes and standards.
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