H Standards IEC 750

H. Standards

List of Standards This section briefly refers to the standards relevant when working with electrotechnical documentation and planning of electrical devices.

The list includes fundamental international standards and more specific electrotechnical standards.

The standards can be ordered from your local Standard Organisation.

Drawing Sheet – format and layout Table 1 in ISO 5457

Title Measurement (mm)

A0 841 x 1.189

A1 594 x 841

A2 420 x 595

A3 297 x 420

A4 210 x 297

HINT 1: The A3-format is the most commonly used format, when drawing circuit diagrams. A3-format can scaled and printed as A4-format.

CADdy++ Electrical Engineering Standards • H-1

Colour Codes Extract of table 1 in IEC 60757: Code for designation of colours.

Letter code Colour

BK Black

BN Brown

RD Red

OG Orange

YE Yellow

GN Green

BU Blue (incl. light blue)

VT Violet (purple)

GY Grey (slate)

WH White

PK Pink

GD Gold

TQ Turquoise

SR Silver

GNYE Green-and-yellow

H-2 • Standards CADdy++ Electrical Engineering

Conductor and Terminal Marking IEC 60445

The following table only deals with certain predetermined conductors. The following table includes for instance, 3 AC supply conductors, supply conductors in DC systems, Neutral and diverse protective conductors.

For the definitions of protective conductors please refer IEC 60050-195.

Table 1 (English):

Designated conductor ID of conductors

Equipment

terminal

marking

Graphical

symbol

IEC 60417

AC conductors

Line 1

Line 2

Line 3

Neutral conductor

L1

L2

L3

N

U

V

W

N

-

DC conductor

Positive

Negative

Mid-point conductor

L+

L-

M

C or +

D or -

+

-

Protective conductor

PE PE

PEN conductor PEN PEN


PEM conductor

PEM PEM

PEL conductor

PEL PEL

Functional earthing conductor

FE FE

Functional-equipontential-bonding

Conductor

FB FB


Preparation of Documents IEC 61082: Preparation of documents used in electrotechnology.

This standard contains the most ordinary directions for composing documents. This includes for example, drawing methods, drawing sheets, layout, text fonts, line widths etc.

If you haven’t previously worked with electrotechnical drawings, it is recommended, that you acquire these standards from your local supplier.

Standard number English title

IEC 61082-1 Preparation of documents used in electrotechnology.

Part 1: General requirements.

IEC 61082-1/A1 Preparation of documents used in electrotechnology.


IEC 61082-1/A2 Preparation of documents used in electrotechnology.



Part 2: Function-oriented diagrams.


Part 3: Connection diagrams, tables


and lists.


Part 4: Location and installation documents.


Reference Designation IEC 61346:

INDUSTRIAL SYSTEM, INSTALLATIONS AND EQUIPMENT AND INDUSTRIAL PRODUCTS.

IEC 61346: Structuring principles and reference designations.

IEC 61666: Identification of terminals within a system.

(IEC 61346 and IEC 61666 replace the former IEC 750)

This norm defines the organised methods used within electrotechnical systems, including a review of various applications such as; function (=), location (+) and letter codes.

Hint 1: According to IEC 60204-1 clause18, electrical equipment of machines must have a reference designation system.

Hint 2: CADdy++ ET economy complies with IEC/IEC 61346.


IEC 61346-1

Replaces former IEC 750

Industrial systems, installations and equipment and industrial products.

Structuring principles and reference designations.

Part 1: Basic rules

IEC 61346-2

Validated 2000-02-29


Structuring principles and reference designations.

Part 2: Classification of objects and codes for classes.


IEC 61666

Replaces former IEC 750


Identification of terminals within a system.


Graphical symbols for diagrams IEC 60617: Graphical symbols for diagrams

As a consequence of dynamic development, IEC has decided to make the IEC 60617 standard series a database located on http://dom2.iec.ch/iec60617. You need a password to access the database or alternative contact your local Standardisation Organisation for further details or get a snapshot of the database.

For information, the former paper-based IEC 60617 was composed of 13 parts and included a graphical depiction of all symbols for electrotechnical circuit diagrams and installation diagrams.

Below we have included the former list for information, but we recommend that you check the IEC homepage at www.iec.ch for further information.

HINT 1: The symbols in CADdy++ ET comply with this database.

LIST.


IEC 60617-1 Graphical symbols for diagrams.

Part 1: General information, general index, cross-reference tables.


Part 2: Symbol elements, qualifying symbols and other symbols having general application.



http://dom2.iec.ch/iec60617

http://www.iec.ch/

Part 3: Conductors and connecting devices.


Part 4: Basic passive components.


Part 5: Semiconductors and electron tubes.


Part 6: Production and conversion of electrical energy.


Part 7: Switchgear, controlgear and protective devices.


Part 8: Measuring instruments, lamps


and signalling devices.


Part 9: Telecommunications: Switching and peripheral equipment.


Part 10: Telecommunications: Transmission.


Part 11: Architechtural and topographical installation plans and diagrams.


Part 12: Binary logic elements.


Part 13: Analogue elements.


Letter Codes IEC 61346-2: Classification of objects and codes for classes.

The standard introduces a new way of reflecting objects. According to this new standard, objects must be classified in accordance with their purpose or task:

The new idea behind this classification always is "what is the real purpose or task of the object", and not "what is the method for implementing the task" or “how it’s physically done". Below, various examples are given.

Example 1: A current transformer has the task to pick-up a property from a system and to provide a signal or information that can be further processed. This task is independent from any technical solution of how to do this. The realisation may be done by means of electrical windings in a transformer, but could also be done with an optical current transformer.

Whether electrical windings or an optical device are used are of no matter to the classification. The main task is still the same: Converting an input variable into a signal for further processing – classified as B.

It is of no importance to the classification, that the transformer in practice is picking up the signal by converting (class “T”) the energy.

NOTE: Many objects have more than one task, and only one letter must be used as a classification. Use of class “A” should be avoided, since it’s not very precise. However, almost any object has a main task, and the most descriptive classification must then be used.


Example 2: For controlling the level in a well, two level-switches are used for controlling and one level switch (at top) is used as alarm.

In the circuit diagrams, the controlling switches are classified as B, because they convert an input variable (the level) to another signal (on/off) for further processing:

If the same type of level switch is used as alarm, the classification of the level switch is still B, since the main task of the object is converting a signal for further processing – and not “making an alarm”.

Example 3: Since the letter codes are classifications, they are intended to cover both electrical and mechanical objects.

The purpose of a mechanical manometer is e.g. to show pressure. Therefore it’s classified as P – presenting information.

The purpose of an electrical signal lamp is also to present information, and therefore it’s classified as P too.

HINT 1: The CADdy++ ET symbol library EN61346-2 conforms with these classifications.


Extract of IEC 61346-2 - Table 1

CODE Purpose or task of object A Two or more purposes or tasks

NOTE: This class is only for objects for which no main purpose or task can be identified.

B Converting an input variable (physical property, condition or event) into a signal for further processing

C Storing material, energy or information

D (Reserved for future standardisation)

E Providing radiant or thermal energy

F Direct protection (self-acting) of a flow of energy, signals, personnel or equipment from dangerous or unwanted conditions Including systems and equipment for protective purposes

G Initiating a flow of energy or material Generating signals used as information carriers or reference source Producing a new kind of material or product

H (Reserved for future standardisation)

I Not to be applied

J (Reserved for future standardisation)

K Processing (receiving, treating and providing) signals or information (excluding objects for protective purposes, see class F)

L (Reserved for future standardisation)

M Providing mechanical energy (rotational or linear mechanical motion) for driving purposes

N (Reserved for future standardisation)

O Not to be applied

P Presenting information

Q Controlled switching or varying a flow of energy, of signals or of material (For signals in control circuits, see classes K and S)

R Restricting or stabilising motion or a flow of energy, information or material


S Converting a manual operation into a signal for further processing

T Conversion of energy maintaining the kind of energy Conversion of an established signal maintaining the content of information Conversion of the form or shape of a material

U Keeping objects in a defined position

V Processing (treating) of material or products (including preparatory and post-treatment)

W Guiding or transporting energy, signals, material or products from one place to another

X Connecting objects

Y (Reserved for future standardisation)

Z (Reserved for future standardisation)

HINT 1: If more than one reference name can be used, the most specific name should be applied.

For example, use the letter code “S” on a pushbutton including a signal lamp (on the pushbutton (class S) as well as the signal lamp (class P)), because this is the most important letter (dependent of the function, however).

Read more about:

Former Letter Codes (IEC 750) on page H-16.


Former Letter Codes (IEC 750) IEC 750: Letter codes for designation of kind of item.

The following list is informative, because IEC 750 is no longer valid, but is replaced by IEC 61346-1 and IEC 61346-2.

The new letter codes classifying objects can be found in Letter Codes (IEC 61346-2, table 1) on page H-12.

CODE Kind of item Examples

A Assemblies, subassemblies Amplifier using discrete components, magnetic amplifier, laser, maser, printed circuit board

B Transducers, from nonelectrical to electrical quantity or vice versa

Thermoelectric sensor, thermo cell, photoelectric cell, dynamometer, crystal transducer, microphone, pick-up, loudspeaker, synchro, resolver

C Capacitors

D Binary elements, delay devices, storage devices

Digital integrated circuits and devices, delay line, bistable element, monostable element, core storage, register, magnetic tape recorder, disk recorder

E Miscellaneous Lighting device, heating device, device not specified elsewhere in this table

F Protective devices Fuse, over-voltage discharge device, arrester

G Generators, power supplies Rotating generator, rotating frequency converter, battery, oscillator, quartz-oscillator

H Signalling devices Optical indicator, acoustical indicator


J - -

K Relays, contactors

L Inductors, reactors Induction coil, line trap, reactors (shunt and series)

M Motors

N Analogue elements Operational amplifier, hybrid analogue/digital device

P Measuring equipment, testing equipment

Indicating, recording and integrating measuring devices, signal generator, clock

Q Switching devices for power circuits Circuit breaker, disconnector

R Resistors

S Switching devices for control circuits, selectors

Control switch, push-button, limit switch, selector switch, dial contact

T Transformers

U Modulators, changers Discriminator, demodulator, frequency changer, coder, inverter, converter

V Tubes, Semi-conductors Diode, transistor, thyristor

W Transmission paths, waveguides, aerials Conductor, cable, busbar, waveguide


X Terminals, plugs, sockets Connecting plug and socket clip, test jack, terminal board, soldering terminal strip, link, cable sealing end and joint

Y Electrically operated mechanical devices Brake, clutch, pneumatic valve

Z Terminations, hybrid transformers, filters, equalizers, limiters

Crystal filter, network


H Standards IEC 750

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