Power Supply for Healthcare Facilities: Designing Category 1 Reliability Systems

Power reliability in medicine is a matter of life and death. Modern diagnostic and life-support equipment (ventilators, anesthesia machines, monitors) cannot stop for a single second. Therefore, designing electrical grids for hospitals is one of the most complex chapters in healthcare engineering.

Reliability Categories and Redundancy

According to DBN V.2.5-23 and DBN V.2.2-10:2022, healthcare facilities are classified under Reliability Category 1, with operating rooms and ICUs falling into a special group of Category 1. This requires three independent power sources:

1. Two independent mains feeds from the municipal grid.

2. Automatic Transfer Switch (ATS) that switches power in milliseconds.

3. Diesel Generator Set (DGS) that starts automatically upon loss of voltage on both mains feeds.

Uninterruptible Power Supplies (UPS)

Since a generator needs 10 to 30 seconds to start and reach full capacity, Online UPS systems are mandatory for operating blocks. They provide "zero" switching time, maintaining equipment operation during the critical gap and stabilizing voltage quality.

Isolated Power Systems (IT-Grid)

In surgical zones, a special grounding system called an IT-system (isolated neutral) is used. It eliminates the risk of electric shock to the patient even if a device's insulation is damaged and prevents circuit breakers from tripping during surgery, which is vital for safety.