Generator breakers sizing

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hhsting

Senior Member
Location
Glen bunie, md, us
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Junior plan reviewer
Attached emergency generator supplies fire pump and panel GEN. Panel GEN feeds life safety ATS, Legally optional standby and Optional ATS.

The generator is 400kW at 408/277V three phase with full load amps of 481A. The generator breakers 150A and 600A is there anything in NEC 2017 to size them? Are they correct or incorrect size?

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