Resilient and Reliable Power Supply in a Modern Office Building

This Application Note describes the design of the electrical infrastructure for a modern 10-story head-office building in Milan, Italy, housing 500 employees using IT intensively. It demonstrates how concern for resilience and reliability at design stage can save high maintenance and renovation costs at later stage. Two design approaches are discussed and compared, including a cost comparison. Attention goes to the choice of the electrical distribution scheme, the choice of the earthing configuration, how to cope with harmonic currents, the coordination of many different protection devices, and how to ensure power supply for mission critical loads.

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  • Three lines of defense against power cuts for mission-critical loads
  • Each floor supplied by two independent distribution panels
  • A highly flexible electrical system for future load growth
  • 16% additional cost of electrical installation
  • Considerably lower Life Cycle Cost