Does anyone have any code experience with standby generators and NFPA 110, 2022 Edition?
Can the capacity of a generator fuel tank be base on connected load, or connected load demand on the generator, or the rated capacity of the generator?
Most electrical engineers that we deal with for health care occupancies (99%) spec fuel capacity based on the 100% rating of the generator. It appears that if you base the fuel capacity on connected load and you had a connected load of 60% of the rated capacity of your generator and you add additional load to your emergency system of up to 80% and your tank was based on 60% you would have a problem and would require a larger tank.
But if you base your fuel tank capacity on 100% generator capacity you will always have the correct amount of fuel capacity regardless of the load.
Thanks in advance.
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NFPA 110 (Standard for Emergency and Standby Power) Section 7.9.2 requires a fuel oil day tank be provided when the main tank is not close enough to the generator to provide sufficient suction head from the prime mover integral fuel oil pump. A day tank is also required if the engine manufacturer's fuel pump static head limits are exceeded when the main tank is at full fuel oil level.
Section 5.5.3 indicates minimum sizing requirements for the main tank, while other documents have maximum sizing allowances for the day tank.
I cannot find minimum sizing requirements for the day tank in NFPA 110 or other codes and standards. Can someone point me in the correct direction?
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