Facility types covered
Hospitals
Full Type 1 EES, redundant feeds, OR suites, ICU/CCU patient-care areas, MRI/imaging.
Ambulatory surgery
Type 2/3 EES per occupancy risk, dedicated isolated-power systems where required.
Long-term care
Patient-care space classification, life-safety lighting overlay, oxygen storage rooms.
Clinics & medical office
Lab equipment, dental chairs, sterilization rooms, plus general business-occupancy load.
The Essential Electrical System (EES)
Healthcare codes carve out a separate Essential Electrical System with multiple branches. EEP keeps these as first-class objects — each load is tagged to a branch, and each branch lands on its own panel and transfer switch with no commingling.
NEC 2023 — Article 517
- Type 1 EES (hospital) per
517.30: Life Safety + Critical + Equipment branches, each on a separate ATS. - Type 2 EES (nursing home, ambulatory) per
517.40: Life Safety + Equipment only. - Life Safety branch per
517.33— exit, egress, alarm, communications, generator-set accessories. - Critical branch per
517.34— task illumination, selected receptacles in patient-care spaces, isolated power, nurse calls. - Equipment branch per
517.35— HVAC for OR/ICU, sterilizers, vacuum/medical-gas, sewage/water pumps. - Patient-care space wiring per
517.13— redundant grounding via metal raceway + insulated EGC. - Receptacles in patient-care vicinities per
517.18 / 517.19— minimum 8 (Cat 1) / 14 (Cat 2 critical care), with hospital-grade marking.
CEC 2024 — Section 24
- Vital, conditionally-vital, non-vital branch separation per Rule
24-102. - Vital loads per Rule
24-202on emergency power, transfer within 10 s per24-300. - Patient-care areas per Rules
24-100& Section 26: basic / intermediate / critical with corresponding grounding and isolation. - Isolated-power systems per Rule
24-204for wet locations (cardiac OR, hydrotherapy). - Service / feeder demand with no diversity on life-safety per Rule
8-206(5).
No diversity on life-safety feeders. EEP rejects any user attempt to apply a demand factor <100% on a load tagged to a life-safety branch. The codes treat this as non-negotiable — the engine enforces it, and the violation is recorded in the audit log if attempted.
Transfer switches & generator sizing
- ATS per branch — Life-Safety ATS sized at 100% of LS load, Critical ATS at 100% of critical load, Equipment ATS at 100% of equipment load (no shared ATS in Type 1 EES).
- Transfer time ≤10 s for Life-Safety per NEC
700.12/ CEC24-300. - Generator sizing sums all EES branches with motor-starting kVA added; voltage dip checked at 15% maximum.
- Fuel storage minimum 96 h for hospitals per NFPA 110 Level 1, flagged in the report.
- Paralleling / redundancy options modelled — N+1, 2N, with optional load-shedding logic.
Imaging & specialty loads
- MRI — dedicated K-13 feeder, isolation transformer, quench-vent interlock, copper-only EGC.
- CT / X-ray — momentary inrush current up to 8× steady-state, sized per manufacturer's "long-term" rating.
- Linear accelerators with hardened-room shielding, plus dedicated EES feed.
- Cath labs / hybrid OR with isolated-power panel, line-isolation monitor, equipotential grounding bus.
Outputs you can hand to plan review
- RPT-001 Service Load Calculation with EES branch totals separately reported.
- RPT-002 Panel Schedule tagged with branch (LS / CRIT / EQUIP / NON-ESS).
- RPT-006 Generator Sizing Report with starting-kVA and voltage-dip analysis.
- SLD showing utility, generator, ATS topology, and branch separation.
- TraceStep™ citing every Article 517 / Section 24 rule applied.