PAS 62400:2005 pdf download Structuring principles for technical products and technical product documentation – Letter codes – Main classes and subclasses of objects according to their purpose and task
Scope
This PAS extends the letter codes of the main classes for purposes or tasks of objects inaccordance with IEC 61346-2, Table 1, with a second-letter code for subclasses. Thesespecifications are generally applicable. They apply equally for all disciplines, such asconstruction, process and electrical engineering, and for standards, for example, for powergeneration, power distribution, process engineering facilities, naval architecture and oceanengineering. Additional letter codes may be specified for further subdivision of the classes.
Specification of letter codes for the main and subclasses for infrastructure objects inaccordance with IEC 61346-2, Table 2, are not part of this document.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
EC 61346-2， Industrial systems, installations and equipment and industrial products -Structuring principles and reference designations – Part 2: Classification of objects and codesfor classes
SO 3511-1.Process measurement control functions and instrumentation – Symbolicrepresentation -Part 1: Basic requirements
SO 14617-6:2002，Graphical symbols for diagrams – Part 6: Measurement and controlfunctions
3 Specification of letter codes
Letter codes are specified and are generally applicable for objects fulfilling the followingpurposes or tasks.
Control functions,functional allocation
Functional equipment unit, equipment unit
Product,components
Functionalallocation”
Function, system
Product,component
4 Letter codes for objects based on their purpose or task
4.1 Overview of main classes of objects with associated letter codes
4.2 Rules for generating subclasses
The following rules have been observed for determining the letter codes for the subclasses (2nd data character).
– The main classes as defined in Table 1 are subdivided into subclasses as shown in Table 2, with the exception of the main class with the letter code B.
– The letter codes for subclasses of the main class with the letter code B are specified according to ISO 3511-1.
4.3 Definition of subclasses of objects
Table 3 – Definitions and letter codes of subclasses related to main classes