Because of the technological change and increased integration, Industrial Automation and Control Systems (IACS) are more and more exposed to threats which aggravate intentional and unintentional risk scenarios. This paper defines zoning principles for electricity distribution and energy production environments based on a Zone model, assessment methods, and security controls. The zoning principles are designed to mitigate these risks and to enable the secure integration of IACS in business

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... ses according to international standards and best practices. an energy company and points out necessary controls according to the different requirements and system design. REFERENCES [1] DRAFT IEC 62443-1, 2008, "Industrial communication networks -Network and system security Part 1 Terminology, concepts and models", 7 et sqq.