# EPMS **Domain:** Electrical Monitoring / Facilities **Doc Type:** Technical Concept Node **Maturity:** Developed ## Definition An **EPMS**, or electrical power monitoring system, collects, presents and analyzes electrical measurements, equipment status, power-quality events and alarms across a facility's distribution system. ## Governing Variable The EPMS governs electrical visibility: load, capacity, voltage, current, energy, event sequence and equipment state. ## Material and Computational Manifestation Meters, protective devices, communications, time synchronization, event records, dashboards and analytics create the operational layer. In data centers, EPMS information complements the [[wiki/Building Management System|building management system]] and [[wiki/DCIM|data-center infrastructure management]] rather than replacing either. ## Relation to Governance The system makes electrical topology and condition legible to operators and facility models. Its data can support capacity planning, fault diagnosis and [[wiki/Facility Digital Twin|facility digital twins]]. ## Failure Modes Incorrect scaling, time misalignment, missing topology and stale device status can mislead diagnosis. Monitoring cannot substitute for protection, and a dashboard should not become the only authority on whether equipment is safe to operate. ## Related Ontology [[wiki/Switchgear|Switchgear]] · [[wiki/Telemetry|Telemetry]] · [[wiki/Building Management System|Building Management System]] · [[wiki/DCIM|DCIM]] · [[wiki/Facility Digital Twin|Facility Digital Twin]]