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Field glossary

EPSS

Emergency power supply system: the source, prime mover, transfer equipment, and controls taken together under NFPA 110

Used across 4 Anvilfield field guides, most in Electrical.

Also defined as

  • Datacenter: Emergency power supply system, the whole plant through the ATS load terminals
  • Emergency power supply system, the generator and controls backing the emergency loads

Where this shows up

ElectricalEmergency and standby power systemsElectricalStandby generator installDatacenterGenerator acceptance and turnoverElectricalEmergency and egress lighting

Related terms

ATS3-pole / 4-poleClasskVA (apparent power)kW (real power)Load shedNEC 700 / 701 / 702Power factor (PF)

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