MT 18 - TC 3/MT 18

IEC 61666:2010 establishes general principles for the identification of terminals of objects within a system, applicable to all technical areas (for example mechanical engineering, electrical engineering, construction engineering, process engineering). They can be used for systems based on different technologies or for systems combining several technologies. This second edition cancels and replaces the first edition of IEC 61666 published in 1997 and edition constitutes a technical revision. It includes the following substantial changes with respect to the previous edition:
- the terminology used in the publication has been adapted to the one used in IEC 81346-1 Ed. 2;
- a more comprehensive description of the designation principles is provided;
- additional examples illustrating terminal designations related to the function aspect and location aspect are provided;
- an additional example illustrating the use of terminal designation sets is provided;
- the former informative Annex A has been turned into a clause in the standard.
IEC 61666:2010 has the status of a horizontal standard in accordance with IEC Guide 108

IEC 81346-2:2009, published jointly by IEC and ISO defines classes and subclasses of objects based on a purpose- or task-related view of the objects, together with their associated letter codes to be used in reference designations. The classification is applicable for objects in all technical areas, e.g. electrical, mechanical and civil engineering as well as all branches of industry, e.g. energy, chemical industry, building technology, shipbuilding and marine technology, and can be used by all technical disciplines in any design process. It has the status of a horizontal standard in accordance with IEC Guide 108.

IEC 81346-1:2009, published jointly by IEC and ISO, establishes general principles for the structuring of systems including structuring of the information about systems. Based on these principles, rules and guidance are given for the formulation of unambiguous reference designations for objects in any system. The reference designation identifies objects for the purpose of creation and retrieval of information about an object, and where realized about its corresponding component. This edition includes the following substantial changes with respect to the previous one:
- a new introductory clause providing a description and explanation to the concepts used elsewhere in the publication;
- a more comprehensive description of the structuring principles and rules for structuring are provided;
- "other aspects" are introduced, and the prefix sign # is assigned to these aspects;
- the concept of reference designation group has been deleted;
- the specific term "transition" has been avoided and been replaced by an improved textual description of this phenomenon in annex D;
- a new clause about labelling is introduced;
- the old annexes have been removed with the exception of the annex showing an example of the application of reference designations within a system;
- a new annex explaining the manipulation of objects is introduced;
- 4 new annexes are introduced as rearrangement of detailed examples or explanatory information.
IEC 81346-1:2009 has the status of a horizontal standard in accordance with IEC Guide 108.