Thanks for answering my previous questions; I have another one today.
Is the life safety electrical demand on the generator, for the electrical engineer, based on the normal-duty load (346 bhp), motor load (500 bhp), or the maximum locked-rotor road (572 bhp)? Is there a governing standard that dictates this (IFC/NFPA 20/NFPA 70)? We have a 2,000 gpm, 185 psi rated electric fire pump. Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
3 Comments
Dave Branson
3/24/2023 08:47:11 am
There are several portions of NFPA 20 that address your questions, depending on your specific configuration.
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Todd E Wyatt
3/24/2023 09:24:57 am
“Duty” is referenced (72) times in 2023 NFPA 70 ... (0) times for “Normal Duty”, “Rated Duty”, and “Locked Duty”.
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Alex
3/24/2023 09:28:57 am
NFPA 20 (Section 9.6.2), the emergency power supply system should be capable of carrying the locked-rotor current of the largest motor and the full-load current of all other connected motors simultaneously. However, this requirement is typically applied to the starting condition of the motors, and once they are up and running, the generator must be sized to handle the actual motor load.
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