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Duty Rating Selector (ESP / PRP / COP)

Map the application and hours to the ISO 8528 rating to specify and the NEC article that governs the installation.

Inputs

Inputs and assumptions

NEC 700 emergency, 701 legally required, 702 optional standby, 708 critical operations.

Result

Nameplate rating needed
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Recommended loading at nameplate
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What to check

  • Adopted code edition and the AHJ classification
  • Annual running hours the site will actually use

Related calculators

Screening-grade sizing. Manufacturer load-acceptance curves, ISO 8528-5 transient limits, and the adopted electrical code edition govern the final selection; an engineer signs off before hardware is ordered.

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