The basic international standards for reference designation provide users with generally applicable general rules and letter codes for main classes for the designation of technical objects and their documentation.
The standard for power plants establishes sector-specific specifications based on the basic standards, and also includes options to enable application for different power plant types.
The fulfillment of specific designation tasks and addressing of collections of information necessitates coding systems which establish a relationship between the object names and letter codes.
IEC 81346-2 provides non-sector-specific binding letter codes for main classes and subclasses for technical systems and components, classifying the objects according to purpose and task.
For the designation of power plant systems, table 2 of IEC 61346-2 provides a framework for the designation of "infrastructure objects". This Guideline, B101, assigns the powerplant-specific systems to letter codes based on this framework.

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