The Application Explanations show the many possible ways of using KKS to fulfil the various identification requirements of the engineering disciplines. The application explanations are also structured in keeping with these requirements.

The Application Explanations, which give examples on the use of KKS, contain detailed descriptions for the various engineering disciplines and are subdivided as follows:

• Part A: General KKS application explanations
• Part B: Engineering discipline-specific application explanations
• Part B1: Identification in mechanical engineering
• Part B2: Identification in civil engineering
• Part B3: Identification in electrical and control and instrumentation engineering
• Part B4: Identification of control and instrumentation tasks/functions in process systems and identification of functions in control and instrumentation systems
• Part C: Engineering discipline-specific identification examples. (Publication no longer intended.)

The present Part A comments on applications, which are common to all engineering disciplines, Parts B1 - B4 on engineering discipline-specific applications.

Remark: The VGB-Standard VGB-S-811-01-2018-01-EN "KKS Identification System for Power Stations. KKS Standard and Key Part" is completed by VGB-B 106e "KKS Application Explanations: Parts A, B1–B4" and VGB-B 105.1 "KKS Begriffszuordnungsliste zum Aggregate- und Betriebsmittelschlüssel". 

Additionally the VGB-B 108 d/e "Guideline Rules for the creation of denominations and their application for power plant engineering" and VGB-S-891-00-2012-06-DE-EN "VGB abbreviation-catalogue for power plant technology" are recommended.