Isolated Power Systems Overview
Overview of Isolated Power Systems
An isolated power system provides a critical safety advantage in medical environments by functioning as a predictive, rather than reactive, solution. It enables early detection of potentially hazardous current before a fault causes system failure. Through a line isolation monitor (LIM), hospital staff receive visual indications of leakage current and audible and visual alarms when current exceeds a preset threshold. This early warning capability allows personnel to take timely corrective actions, helping ensure continuous operation of critical medical systems and enhanced patient safety. Additional information can be found in the Iso-Gard Series 6 Line Isolation Monitor (LIM) Catalog, Document Number 4805CT1301.
An isolated, ungrounded, electrical distribution system contains the following components:
 Isolated Power System Components |
| 1 | Isolation Transformer—specifically designed with low leakage current per UL 1047. Includes electrostatic shielding for noise attenuation in the ungrounded system. |
| 2 | PowerPacT™ Circuit Breaker—used for main equipment disconnect; can be coordinated with QOB branch circuit breakers |
| 3 | NQ Interior—provides space for up to 16 branch circuit breakers |
| 4 | Iso-Gard™ Line Isolation Monitor (LIM)—shipped with interior (not shown below) |
| 5 | Hinged Back Box/Trim System —this system houses all other components |
| 6 | Ground Bus—ALCU |
 Typical Isolated Power System Wiring Diagram |
Schneider Electric has been involved in the design and manufacture of isolated power systems since 1944. Our isolated power systems have evolved over the years and will continue to do so to meet the ever-changing needs of the health care industry.