By design, the power-system architectures of hospitals support enhanced electrical behavior that is also adequate to withstand external forces, such as earthquakes, fires, and floods, applying a Darwinian approach. The architecture of the power system, supported by supervision control systems and business continuity management (BCM), must guarantee operational performance that preserves global service continuity. The system design should incorporate fault selectivity and immunity to interference, easy maintainability of the system and its parts, flexibility, and expandability. This article deals with sample cases of systems in building complexes, applying the microapproach to satisfy hospital requirements and medical quality performance.