fire pump OCPD

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greeneps

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Sizing the OCPD for a fire pump at the service is LRA. How does the engineer size the OCPD at the generator.
100HP 3 Phase, 208V
The plans call for a 1600A at the service, but only an 800A at the generator.
 
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spsnyder

Senior Member
The generator OCPD is not sized per LRA. ROT, sized at 125%<OCPD rating<250% FLA.

695.4
(3) A listed combination fire pump controller and power transfer switch
For systems installed under the provisions of 695.3(B)(2) only, such additional disconnecting means and associated overcurrent protective device(s) shall be permitted as required to comply with other provisions of this Code. Overcurrent protective devices between an on-site standby generator and a fire pump controller shall be selected and sized according to 430.62 to provide short-circuit protection only. All disconnecting devices and overcurrent protective devices that are unique to the fire pump loads shall comply with 695.4(B)(1) through (B)(5).
 
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