ISO/TS 16952-10:2008

TECHNICAL ISO/TS
SPECIFICATION 16952-10
First edition
2008-11-15
Technical product documentation —
Reference designation system —
Part 10:
Power plants
Documentation technique de produits — Système de désignation de
référence —
Partie 10: Centrales électriques

Reference number
©
ISO 2008
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ii © ISO 2008 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Designation systematic. 5
4.1 General. 5
4.2 Process of forming designations. 5
4.3 General rules for designation structure . 6
4.4 Rules for forming designations. 7
5 Designation tasks . 8
5.1 General. 8
5.2 Conjoint designation (optional). 9
5.3 Designation of technical objects — Reference designation . 9
5.4 Specific designations. 12
6 Structure and contents of designation blocks . 12
6.1 General. 12
6.2 Designation block “Conjoint designation” . 12
6.3 Function aspect . 13
6.4 Product aspect . 15
6.5 Transition from function aspect to product aspect . 15
6.6 Location aspect. 19
6.7 Specific designations. 22
7 Application of designation. 26
7.1 Combination of designation blocks. 26
7.2 Designation notation . 27
Annex A (normative) Representation of designations . 29
Annex B (normative) Special stipulations . 31
Annex C (informative) Stipulations between parties to the project . 35
Annex D (informative) Application examples . 36
Bibliography . 44

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of document:
⎯ an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
⎯ an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting
a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TS 16952-10 was prepared by Technical Committee ISO/TC 10, Technical product documentation,
Subcommittee SC 10, Process plant documentation and tpd-symbols.
ISO 16952 consists of the following parts, under the general title Technical product documentation —
Reference designation system:
⎯ Part 1: General application rules [Technical Specification]
⎯ Part 10: Power plants [Technical Specification]
Further parts on sector-specific rules are under consideration.
iv © ISO 2008 – All rights reserved

Introduction
Based on ISO/TS 16952-1, this part of ISO 16952 serves to designate plants, sections of plants and items of
equipment in any type of installation for industrial production of electrical and thermal energy according to task,
type and location. This sector-specific Reference Designation System (RDS) is intended for application by all
engineering disciplines for the entire life cycle of a plant, from planning, licensing, construction, operation and
maintenance, re-powering, extension and recreation, to dismantling and demolition. Based on the structuring
principles and reference designation rules of IEC 61346 and other documents, ISO 16952 breaks down these
rules into interdisciplinary guidelines for practical application.
The relationships of input documents with this part of ISO 16952 are shown in Figure 1.

Figure 1 — Structuring and designation standards
This part of ISO 16952 establishes the prerequisites for
⎯ uniform designation of all power plant processes (see Figure 2 for a summary of the energy conversion
cycle),
⎯ uniform designation of all power plant types,
⎯ language-independent codes to ensure international applicability,
⎯ adequate capacity and possible detail for designation of all systems, equipment and structures,
⎯ adequate extension possibilities for new technologies,
⎯ consistent designation for planning, licensing, construction, operation, maintenance and decommissioning,
⎯ common applicability in mechanical, electrical, instrumentation and control (I&C) and civil engineering,
with the simultaneous possibility to designate according to function, product and location aspects,
⎯ fulfilment of quality management requirements,
⎯ fulfilment of the technical documents management system requirements,
⎯ fulfilment of the requirements for occupational safety and ergonomics.

Figure 2 — Principle of energy conversion including supply and disposal processes

vi © ISO 2008 – All rights reserved

TECHNICAL SPECIFICATION ISO/TS 16952-10:2008(E)

Technical product documentation — Reference designation
system —
Part 10:
Power plants
1 Scope
This part of ISO 16952 contains sector-specific stipulations for structuring principles and reference designation
rules on technical products and technical product documentation of power plants.
It applies in combination with ISO/TS 16952-1, IEC/PAS 62400 and VGB B 101 for the classification of
systems and objects, and for function-, product- and location-specific designation of technical products and
their documentation for power plants.
It specifies the designation blocks for the clear identification and localization of the technical products, which
are used for their labelling in the plant, for their designation in technical documents and for the designation of
the technical documents as well.
This part of ISO 16952 encompasses the process of energy conversion. The specifications in this part of
ISO 16952 apply for the power plant process, for the primary energy supply and final products distribution, as
well as for auxiliary media and auxiliary energy supply, waste materials and waste energy disposal.
This part of ISO 16952 is not applicable to recovery of the primary energy and the media for supplying the
process, nor to the processing of residues from process disposal (e.g. gypsum, slag products, waste water,
etc.).
2 Normative 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 edition of the referenced
document (including any amendments) applies.
ISO/TS 16952-1:2006, Technical product documentation — Reference designation system — Part 1: General
application rules
IEC 60445, Basic and safety principles for man-machine interface, marking and identification — Identification
of equipment terminals and of terminations of certain designated conductors, including general rules of an
alphanumeric system
IEC 61082-1, Preparation of documents used in electrotechnology — Part 1: Rules
IEC 61175, Industrial systems, installations and equipment and industrial products — Designations of signals
IEC 61346-1, Industrial systems, installations and equipment and industrial products — Structuring principles
and reference designations — Part 1: Basic rules
IEC 61355, Classification and designation of documents for plants, systems and equipment
IEC 61666, Industrial systems, installations and equipment and industrial products — Identification of
terminals within a system
IEC/PAS 62400, Structuring principles for technical products and technical product documentation — Letter
codes — Main classes and subclasses of objects according to their purpose or task
EN 50005, Low Voltage Switchgear and Controlgear for Industrial Use — Terminal Marking and Distinctive
Number — General Rules
1)
VBG B 101, Letter code for systems in power plants
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO/TS 16952-1 and the following apply.
3.1
ancillary system
system which is not directly required for the power plant process
NOTE This includes heating, ventilation, air-conditioning systems, space-heating systems, stationary compressed air
supplies, fire protection systems, cranes, elevators, workshops, staff amenities, etc.
3.2
aspect
specific way of selecting information on or describing a system, or an object of a system
NOTE Such ways may be:
⎯ what the system or object is doing (function viewpoint);
⎯ how the system or object is constructed (product viewpoint);
⎯ where the system or object is located (location viewpoint).
[IEC 61346-1]
3.3
auxiliary system
system which is required for the support of a power plant process
NOTE This includes auxiliary steam system, compressed air, carrier air, control air, central chemicals supply,
sampling systems, etc.
3.4
control
purposeful action on or in a process to meet specified objectives
[IEC 60050-351]
NOTE This includes measure, count, monitor, indicate, alert, record, log, manipulate, evaluate, optimize, intervene,
manipulate by hand, safeguard, structure, configure, parameter, automate.
3.5
designation block
structured compilation of related information units, consisting of a prefix, letters and numbers, and optionally a
breakdown mark
1) Source: www.vgb.org
2 © ISO 2008 – All rights reserved

3.6
document kind class
group of document kinds having similar characteristics concerning the content of information independent of
the form of presentation
[IEC 61355]
3.7
documentation
collection of documents related to a given subject
NOTE This may include technical, commercial and/or other documents.
[IEC 61082-1]
3.8
functional area
combination of groups and/or elements in a unit that can be used independently
3.9
functional group
combination of elements in a unit that can be used independently
3.10
functional unit
item under consideration defined according to function or effect
NOTE 1 A functional unit produces the interactive effect between input variables and output variables.
NOTE 2 A functional unit may be implemented by one or several physical units or program modules.
NOTE 3 If compound terms are used to designate functional units, the following should be used as the last word
(in ascending order of rank):
⎯ element;
⎯ equipment;
⎯ system.
For the subject under consideration, it is understood that “element” should designate the smallest functional
unit in each case.
[IEC 60050-351]
3.11
multi-level reference designation
reference designation derived from a structural path through an overall system
[IEC 61346-1]
3.12
object
entity treated in the process of design, engineering, realization, operation, maintenance and demolition
NOTE 1 The entity may refer to a physical or non-physical “thing”, or to a set of information associated with it.
NOTE 2 Depending on its purpose, an object may be viewed in different ways called “aspects”.
[IEC 61346-1]
3.13
operating equipment
all products, which serve to implement technical tasks as a whole or in individual parts
3.14
physical unit
item under consideration, defined according to construction or configuration
NOTE 1 One or several functional units may be implemented in a single physical unit. The corresponding functional
unit(s) is/are in some cases not explicitly designated.
NOTE 2 The various parts of a physical unit need not be functionally interrelated. For example, a physical unit may be
in the form of an integrated circuit with four independent AND modules.
NOTE 3 If compound terms are used to designate physical units, the following should be used as the last word
(in ascending order of rank):
⎯ component;
⎯ assembly;
⎯ device;
⎯ plant.
For the subject under consideration it is understood that “component” should designate the smallest physical unit in each
case.
NOTE 4 The designations of conceptually corresponding functional units and physical units are stated together in the
following if they are commonly used but different from each other.
[IEC 60050-351]
3.15
plant
complete set of technical equipment and facilities for solving a defined technical task
NOTE A plant includes apparatus, machines, instruments, devices, means of transportation, control equipment and
other operating equipment.
[IEC 60050-351]
3.16
plant section
part of a process plant that can, at least occasionally, be operated independently
[ISO 10628]
3.17
power plant process
process for the generation of electrical energy and/or heat energy products, including the conversion, supply,
and disposal processes
3.18
power plant unit
technical plant including all equipment needed for fulfilment of a power plant process
4 © ISO 2008 – All rights reserved

3.19
system
set of interrelated objects
NOTE 1 Examples of a system: a drive system, a water supply system, a stereo system, a computer.
NOTE 2 When a system is part of another system, it may be considered as an object.
[IEC 61346-1]
3.20
technical equipment
physical or functional unit used to fulfil a technical task
3.21
terminal
point of access to an object intended for connection to an external network
NOTE 1 The connection may refer to
a) a physical interface between conductors and/or contacts, or piping and/or duct systems to provide a signal, energy or
material flow path,
b) an association of functional nature established between logical elements, software modules, etc. for conveying
information.
NOTE 2 The external networks may be of different nature and accordingly they may be classified. IEC 81714-3
provides such classifications.
[IEC 61666]
3.22
works
system of industrial complexes and the associated infrastructure in one location
[ISO 10628]
4 Designation systematic
4.1 General
The designation systematic has to be understood as a well-organized, methodical process of forming
permanent designations with ergonomic notation according to simple, easily learned rules that are based on
predefined standards.
4.2 Process of forming designations
Starting from site plans, process flow diagrams, overview diagrams, etc., the entire power plant shall be
broken down into plant sections, units and, if necessary, sub-units.
These shall then be further broken down, based on functional aspects, into systems, subsystems and
technical equipment. Consistent compliance with the rule of constituency (an object can contain more than
one sub-objects but is a constituent of one higher object only) shall be ensured. The objects identified in this
way shall be classified based on specified letter codes in accordance with VGB B 101 for systems and
subsystems and IEC/PAS 62400 for technical objects, and then provided with reference designations. All
information about the object is governed under this designation.
Structuring of location-specific systems (structures, sites, etc.) shall be performed in the same way.
In further processing, the products required for fulfilment of the tasks shall be specified and designated. The
combination of the function and product aspects generates a unique designation.
The results shall be documented.
4.3 General rules for designation structure
The general designation structure corresponds to ISO/TS 16952-1:2006, 6.1. It shall consist of a maximum of
three main parts, see Figure 3.
Identifier
Conjoint designation Reference designation Specific designation
– Site Technical objects based on – Signals
– Factory complex – Function aspect – Terminals
– Power plant unit – Product aspect – Documents
– Subsystems based on project- – Location aspect
specific requirements
Figure 3 — Parts of the identifier
The permitted combinations and their sequence are given in Figure 4.
Conjoint designation
Conjoint designation Reference designation
Conjoint designation Reference designation Specific designation
Conjoint designation Specific designation
Reference designation
Reference designation Specific designation
Figure 4 — Permitted combinations of identifier parts
Each of the three identifier parts consists of one or more designation blocks (see Figure 5 and Clause 6).
Each designation block always contains
⎯ a prefix in accordance with Table 1 and
⎯ letters and numbers in accordance with Figure 6.
Prefix Letters and numbers
Figure 5 — Designation block
The designation blocks are distinguished by prefixes and thus uniquely identified. The prefixes are always the
first data characters in the designation blocks.
6 © ISO 2008 – All rights reserved

Table 1 — Prefixes for designation tasks
Prefix
Prefix origin, basic principles
Designation Designation tasks/aspect
specified in
1 2
# Number Conjoint designation ISO/TS 16952-1
= Equals Function-oriented designation IEC 61346-1
= = Equals-Equals Functional allocation ISO/TS 16952-1
+ Plus Point of installation IEC 61346-1
+ + Plus-Plus Location ISO/TS 16952-1
− Minus Product-oriented designation IEC 61346-1
: Colon Terminal designation IEC 61666
; Semicolon Signal designation IEC 61175
& Ampersand Document designation IEC 61355

The letter codes and numbers in the designation blocks are subdivided into breakdown levels, sections and
data characters as the smallest information unit.
The letters classify an object and are specified as letter codes in the corresponding tables (see
IEC/PAS 62400, VGB B 101).
The numbers are used to distinguish between objects with the same letter code, if they are constituents of the
same object.
The basic structure is shown in Figure 6. Details of the individual designation blocks are specified in Clause 6.
Breakdown level 1 2
Section 1 2 3 4
Number/type of data position A A A N N A A N N N

Key
A = Letter
N = Number
Figure 6 — Basic structure of the designation part of a designation block
4.4 Rules for forming designations
⎯ Rule 1: Each object can be viewed in one or more ways called aspects (see 5.3.1). The considered
aspect is indicated by a prefix (see Table 1). The prefix shall be written always when a misinterpretation
of the aspect is possible.
⎯ Rule 2: Sections at the beginning and/or at the end of a designation block may be omitted.
⎯ Rule 3: Only the transition from the function aspect to the product aspect is allowed.
⎯ Rule 4: Designation of operating equipment shall be achieved exclusively by the transition from the
functional aspect to the product aspect. The location-oriented designation carries the allocation
information only.
⎯ Rule 5: When designation blocks are combined, the prefix of the block that is the furthest to the right
(smallest object of consideration) shall determine the aspect of the entire designation.
⎯ Rule 6: The structure within an aspect shall comply with the principle of constituency in accordance with
IEC 61346-1. Each object has only one predecessor, but can have one or more successors.
⎯ Rule 7: Information regarding the installation and location of an object as well as the interaction of the
object in the power plant process shall be represented by attaching the designations “+ point of
installation”, “++ location” and “== functional allocation” respectively as a separate additional designation.
⎯ Rule 8: The multi-level reference designations shall be presented in designation blocks with a fixed
structure. The designation blocks shall be identified with regard to their aspect by prefixes, which have
their own data character positions.
⎯ Rule 9: Each designation section shall consist of a maximum of three data characters, but not all of these
need to be written, depending on the application. The sections shall be structured with alternating
alphabetic (A) and numeric (N) characters.
⎯ Rule 10: The letter codes from IEC/PAS 62400 and VGB B 101 shall be used for the classification of
objects. Only Roman capitals from A to Z, with the exception of “I” and “O”, are permitted; country-specific
letters and mnemonic assignments shall be avoided.
⎯ Rule 11: Arabic numerals “1” to “9” and “0” (zero) shall be used for numerical data characters; numbers
shall be written with leading zeros.
⎯ Rule 12: For certain designation blocks between breakdown levels, the breakdown mark “.” (full stop)
with its own data position shall be applied. In this case Rule 2 shall apply for each part of the designation
block on the left and on the right side of the breakdown mark.
5 Designation tasks
5.1 General
The designation system for power plants shall fulfil the following main tasks:
a) unambiguous identification of the technical objects and documents;
b) classification of objects according to their purpose, task or composition;
c) coded representation of technical structures;
d) coded representation of networked relationships.
This enables the designation of the following:
⎯ conjoint allocations (factories, plant complexes, power plant units, etc.);
⎯ technical objects (systems, plants, technical equipment, components, etc.);
⎯ electrical and mechanical connections;
⎯ signals and potentials;
⎯ documents.
The structure and contents of designation for these different tasks are specified in Clause 6.
8 © ISO 2008 – All rights reserved

5.2 Conjoint designation (optional)
It may be required to identify different sites. Moreover, different power plant units, non-unit-aligned or common
plants and systems, different extension stages as well as power plant extrinsic works can exist or be planned
on the same site (e.g. at cogeneration power plants). Conjoint designation facilitates a unified identification of
such different plant complexes (for an example see Figure D.1).
Conjoint designation is a reference designation of a plant/system with respect to the site not being related to
one of the defined aspects.
If it is used as part of the identifier, then systems, objects and products which fulfil the same task in different
plants can have the same reference designation. The unambiguous nature of the equipment designation is
achieved by using different conjoint designations. This provides significant ergonomic and economic
advantages.
The use of the conjoint designation is optional.
5.3 Designation of technical objects — Reference designation
5.3.1 General
Reference designation identifies objects for the purpose of correlating information about an object among
different kinds of documents with the products implementing the system. A reference designation shall
unambiguously identify an object of interest within the considered system.
An object within a system can be viewed in different ways, called aspects:
⎯ What does the object do? (function aspect)
⎯ How is the object constructed? (product aspect)
⎯ Where is the object located? (location aspect)
5.3.2 Function aspect
A function-oriented structure is based on the purpose of a system, without necessarily taking into account the
products with which this purpose is fulfilled or their location.
Designation by function aspect is applied in an early planning phase of a project, and remains unchanged
over the entire service life of an overall plant.
In power plant engineering, a distinction is made between functional units with static tasks (see 6.3.1) and
those with dynamic effect (see 6.3.2).
Figure 7 shows a diagram of a system consisting of several functions.
NOTE The notations in this diagram are not based on standardized letter codes.
Subtask =ST2 consists of heat exchanger =EP1 and pump =GP1.
Figure 7 — Diagram of functional units by task (subtasks ST) and effect (subprocesses SP)
As a subfunction of subtask =ST2, heat exchanger =EP1 has effects both in subprocess ==SP1 as well as in
==SP2.
Figure 8 shows the relationships in two structure trees with the constituent relations in each of the tree-like
structures (solid lines) and the allocation (associative relations) between these two structures (dashed lines).

Figure 8 — Function structures by task (subtasks ST) and effect (subprocesses SP)
5.3.3 Product aspect
A product-oriented structure is based on the way in which a system is implemented, constructed or delivered,
including the use of intermediate or end products, without necessarily taking into account their functions
and/or locations.
Designation by product aspect is used in the manufacture of equipment parts without taking into account their
application or places of use.
In power plant engineering, the designation according to product aspect is specifically restricted (see 6.4).
10 © ISO 2008 – All rights reserved

5.3.4 Transition from function aspect to product aspect
It is possible and often expedient to identify an object in a system using two aspects. Different aspects may be
used for successive objects by making a transition from one aspect to another. Prerequisite for this is that the
object is exclusively associated with the preceding functional unit.
Figure 9 shows the transition from the function aspect to the product aspect and allocation to the location
structure for the example of the multi-level reference designation =LAB12 QM001 -QA01 (feed water piping
system, train 12, isolation 1; power breaker 1).

Figure 9 — Transition from function aspect to product aspect and allocation (associative relation)
5.3.5 Location aspect
A location-oriented structure is based on the topographical layout of a system and/or the surroundings in
which the system is located, without necessarily taking into account products and/or functions.
This additional aspect enables distinction between the following:
⎯ designation of points of installation within design units or modules of electrical and I&C systems, as well
as designation of locations in mechanical engineering equipment (installation aspect);
⎯ designation of object locations (erection aspect).
Designation by location aspect is applied in the designation of objects which perform the task of providing
points of installation for other technical objects.
This type of designation is used for allocation of the equipment parts to their locations (point of installation,
location).
5.4 Specific designations
5.4.1 Signal designation
Signals are the carriers of information and shall be designated unambiguously. The principles are specified in
IEC 61175.
5.4.2 Terminal designation
Electrical and mechanical terminals shall be designated unambiguously. The principles are specified in
IEC 61666.
5.4.3 Document designation
Documents shall be designated unambiguously. A non-manufacturer-specific, uniform and object-related
designation in accordance with IEC 61355 is required for power plant technology.
6 Structure and contents of designation blocks
6.1 General
The designations are structured in the form of designation blocks, which are subdivided into sections
(alphabetical and numerical). The number and type of data characters for the individual designation tasks are
specified and described in the following subclauses.
The alphabetical sections classify systems, plants and technical equipment, components, points of installation
and locations as well as signals, connections and documents according to their purpose or task. The
numerical sections serve for distinction and numbering.
The rules specified in 4.4 apply.
6.2 Designation block “Conjoint designation”
Each of the two identification levels has a maximum of 12 data characters. The structure of the designation
block, the contents, the meaning as well as the type and number of data characters shall be defined
separately for every project.
Figure 10 shows the structure and contents of the designation block “Conjoint designation”.

Figure 10 — Structure and contents of designation block “Conjoint designation”
12 © ISO 2008 – All rights reserved

6.3 Function aspect
6.3.1 Designation block “Function”
This designation block is used for function-oriented structuring with regard to the task and purpose (static
tasks) of the technical objects. It is used to designate systems, plants, subsystems and technical equipment,
see Figure 11.
Figure 11 — Structure and contents of designation block “Function”
Figure D.2 shows an example of breakdown level 0. Figure D.3 shows an example of a civil engineering
object.
6.3.2 Designation block “Function allocation”
6.3.2.1 General
This designation block is used for function-oriented structuring with regard to interaction (dynamic effect) of
technical objects. It is used to designate relationships between functions, technical equipment and
components.
6.3.2.2 Designation of functional areas and groups as “Function allocation (group level)”
This designation block is used to designate functional areas and/or functional groups of technical objects,
which are represented under a functional aspect different to that in the designation block “Function”, see
Figure 12.
Universally valid contents cannot be specified (for examples see Figures D.4 and D.5).
Figure 12 — Structure and contents of designation block “Function allocation” for functional areas
6.3.2.3 Designation of technical equipment as “Function allocation (individual level)”
This designation block is used to designate technical equipment which is viewed in the sense of the function
allocation.
Figure 13 — Structure and contents of designation block
“Function allocation for technical equipment”
14 © ISO 2008 – All rights reserved

Table 2 — Control tasks for “Function allocation”, section 5, data characters 1 and 2
Code Denomination
AA Alarms, monitoring
CA Closed-loop feedback control
CB Reference loop control
HA Operation and monitoring
MA Direct measurement
MB Measurand calculation
SA Individual control
SB Group control
ZA Equipment protection
ZB Plant protection
Further stipulations, if necessary, should be project-specific.
6.4 Product aspect — Designation block “Product”
This designation block is used for product-oriented designation of electrical and mechanical objects, see
Figure 14.
If an object is to be further broken down into its parts, the “nested product-oriented designation” shall be
applied, where several blocks are concatenated in the sense of the multi-level reference designation. The
prefix shall be placed in front of the first designation block only (example see Figure D.6).

Figure 14 — Structure and contents of designation block “Product”
6.5 Transition from function aspect to product aspect
For unambiguous identification of technical objects in power plant engineering, the possibility is used to
simultaneously follow objects according to both function and product aspects. The structure of such a
designation block is shown in Figure 15, with Examples 1 and 2.
Figure 15 — Structure of the designation block “Equipment”
EXAMPLE 1 =C01 MDK51 GP001 –MA01XD02
wind turbine generator system C01, wind turbine system MD, power transmission (drive train) K,
transmission lubricant subsystem 51, conveying GP001; electric motor MA01, junction box XD02
EXAMPLE 2 =C01 MDY10 QA001 –QA07
wind turbine generator system C01, wind turbine system MD, control system Y10, power unit QA001;
circuit breaker QA07
The first letter codes in breakdown level 1 of the function aspect are given in Table 3. Selected first letter
codes are illustrated in Figure 16.
The first letter codes in breakdown level 2 of the function aspect and of breakdown levels 1 and 2 of the
product aspect are given in Table 4.
16 © ISO 2008 – All rights reserved

Table 3 — Letter code for designation block “Function”,
breakdown level 1, section 1, data character 1 (according to VGB B 101)
Class code Denomination
Objects for conjoint A Systems for common tasks
tasks
Objects for the power B Electrical auxiliary power supply systems
plant process
C Control and management systems
D Function allocation (group level)
E Fuel supply and residue disposal (excluding nuclear)
F Handling of nuclear equipment
G Water supply, disposal and treatment
H Heat generation including flue gas exhaust and treatment (excluding nuclear)
J Nuclear heat generation
K Nuclear auxiliary systems
L Water, steam, gas systems
M Systems for generation and transmission of electrical energy
N Process energy supply for external consumers
P Cooling water systems
Q Auxiliary systems
R Utilization of heat from regenerative energy sources (excluding combustion
processes)
S - reserved for later standardization -
T - reserved for later standardization -
U Structures and areas for systems inside of the power plant process
Objects which are not V Systems for storage of material or goods
allocated to the power
W Systems for administrative or social purposes or tasks
plant process
X Ancillary systems
Y Communication and information systems
Z Structures and areas for systems outside of the power plant process

Figure 16 — Overview with letter codes and denominations, e.g. steam power plant
Table 4 — Letter code for designation block “Function”, breakdown level 2, section 3, data character 1
and for designation block “Product”, breakdown level 1, section 1, data character 1 and breakdown
level 2, section 3, data character 1 (according to IEC/PAS 62400)
Code Denomination
A Two or more purposes or tasks
B Conversion of an input variable (physical property, condition or event) to a specific signal for further
processing
C Storage of energy, information or material
D - reserved for future standardization -
Providing radiant or thermal energy
E
F Direct (self-acting) protection of an energy or signal flow, of personnel or facilities from dangerous or
unwanted conditions including systems and equipment for protective purposes
G Initiation of an energy or material flow; generation of signals which are used as an information carrier or
reference source
H Production of a new type of material or product
J - reserved for future standardization -
K Processing (receipt, processing and providing) of signals or information (with the exception of objects for
protection purposes, see class F)
L Reserved for future standardization
M Providing mechanical energy (rotational or linear mechanical notion) for driving purposes

18 © ISO 2008 – All rights reserved

Table 4 (continued)
Code Denomination
N - reserved for future standardization -
P Presentation of information
Q Controlled switching or variation of a flow of energy, signal or material (see classes K and S for signals in
closed/open feedback control loops)
R Restriction or stabilization of movement or flow of energy, information or material
S Conversion of a manual operation to a specific signal for further processing
T Conversion of energy while maintaining the kind of energy, conversion of an established signal while
maintaining the content of information, conversion of the form or shape of a material
U Keeping objects in a defined position
V Processing (handling) of material or products (including pre-treatment and post-treatment)
W Conducting or routing energy, signals, materials or products from one location to another
X Connecting objects
Y - reserved for future standardization -
Z - reserved for future standardization -

6.6 Location aspect
6.6.1 Designation block “Point of installation”
6.6.1.1 General
This designation block is used for designating the points of installation of technical products. Different
designation blocks are specified according to the tasks in the various disciplines:
2)
⎯ points of installation in electrical/I&C installation units (consoles, panels, cabinets);
⎯ points of installation in electrical/I&C installation units oriented to mechanical systems;
⎯ points of installation in electrical/I&C installation units oriented to locations;
⎯ points of installation in technical equipment for mechanical and civil engineering.
NOTE For the designation of points of installation, the contents of the designation block “= Function” (or parts of it)
can be used as the “+ point of installation”. The aspect of the designation is determined solely by the prefix (+).
6.6.1.2 Points of installation in electrical/I&C installation units
The structure and contents of the des
...