Electrical Engineering & Design
Emergency Power Systems
Generator, ATS, and EPSS engineering for healthcare, mission-critical, and life-safety installations.
Overview
Emergency power systems carry life-safety, critical, and equipment branch loads when utility power fails. We engineer generator sets, paralleling switchgear, automatic transfer switches, and the distribution that ties them to loads. Everything is sized correctly, coordinated, and compliant with NEC articles 700, 701, 708, NFPA 110, and NFPA 99 for healthcare. Every design ships with the coordination study and load calculations the AHJ will ask to see.
What's included
Scope of work
Load study and generator sizing (including step-load and motor-starting analysis)
EPSS classification: type, class, level per NFPA 110
ATS specification with appropriate withstand and transition type
Paralleling switchgear design where multiple gensets are required
Branch separation and selective coordination per NEC 700/701/708/517
Fuel storage sizing and Class I location classification review
Acceptance testing protocol per NFPA 110 chapter 8
Methodology
How the engagement runs
A consistent process means predictable timelines, fewer surprises, and a defensible record if anyone (AHJ, insurance, OSHA) asks how the work was done.
- 01
Load profile and classification
Loads inventoried and assigned to life-safety, critical, equipment, or optional standby branches.
- 02
Generator sizing
Steady-state, step-load, and motor-starting load capability evaluated; sizing software run to confirm voltage and frequency dip within limits.
- 03
EPSS design
ATS, paralleling gear, and branch distribution drawn up with full schedules.
- 04
Coordination
TCC study confirms the 0.1-second selectivity requirement for emergency branches.
- 05
Acceptance testing
NFPA 110 chapter 8 acceptance test protocol prepared for the commissioning team.
Stamped
100%
Every deliverable PE-stamped by a licensed engineer in the project state. Across all 24 registered states.
Response
1 day
We respond to every inquiry within one business day with a scoped proposal and a real timeline.
Veteran-owned
VOSB / SDVOSB
SAM.gov registered. UEI H6HAZKAD4LJ7 · CAGE 08E02. Set-aside eligible.
When you need it
Triggers
- →New healthcare facility or critical-care expansion
- →Generator replacement or capacity upgrade
- →Addition of life-safety loads (egress lighting, fire pumps)
- →Insurance or accreditation finding
What you receive
Deliverables
- PE-stamped EPSS construction documents
- Sizing calculations and step-load analysis
- ATS and paralleling switchgear specifications
- Coordination study for emergency branches
- NFPA 110 chapter 8 acceptance test procedure
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Ready to scope your emergency power systems engagement?
Send us the basics (facility type, equipment, timeline) and we’ll respond with a scoped proposal within one business day.