IEC Document Designation 

By on

Often document control is dictated by project requirements, for example a particular organisation may have an existing numbering system. Existing company or group/department document control systems may also be employed. In the absence of any agreed document control, it is recommended that the system detailed in IEC 61355 be followed.

IEC 61355 Document Designation

The IEC 61355 standard provides rules and guidelines for the classification of documents based on their characteristic content for all technical areas which are in use during the life cycle of a plant, system or equipment.

document - fixed and structured amount of information intended for human perception that can be managed and interchanged as a unit between users and systems

DCC - document classification code

A document designation combines a designation of the object to which the document is assigned and the DCC together with a counting number. The document counting number has no meaning other than to differentiate different documents. In addition, this document designation may be supplemented by a page counting number.

 

IEC61355DocumentDesignation

 

The object designation shall unambiguously specify the object to which a document is assigned. This implies that an object designation shall be (or be made) unambiguous in a specified context. The DDC consists of the prefix sign "&" (ampersand) followed by a code consisting of three letters:

· A1 - letter code for technical area
· A2 - represents class level A2
· A3 - represents class level A3

The page counting number is optional. It shall be separated from the document designation part by the character "/" (solidus), which may be omitted if no confusion is likely (or example when the page counting number is shown in a separate section in the title block ).

It should be noted that within any particular organisation, it is not necessary to implement the full document designation.  In particular the DDC could be incorporated as part of an existing document numbering scheme.

IEC 61355 Data Base

The IEC maintain an up to date (and evolving) online database of DDC designations:

IEC 61355 Online Database - as of May 2012, the database did allow free pubic access

The database lists Application Areas (A1 in the DDC) and Activity Areas (A2A3 in the DDC).  In order to facility finding the correct DDC, the database allows searching for documents and listing in different formats (by application area, activity area, presentation form, etc.).

Example – to find a DDC for a single line diagram you can search the data base by application area. For electrical engineering the application area (A1) is identified as 'E'.  Expanding the list and selecting overview diagrams, show the activity area (A2A3) as 'FA'.  The description and examples confirm this is the correct designation to be applied to Single Line Diagrams.  The full DDC is then EFA.

See Also

IEC Reference Designations – Opinion post on object designations



Steven McFadyen's avatar Steven McFadyen

Steven has over twenty five years experience working on some of the largest construction projects. He has a deep technical understanding of electrical engineering and is keen to share this knowledge. About the author

myElectrical Engineering

comments powered by Disqus



Periodic Electrical Installation Inspection – What to Inspect?

This is the second post in a series of two on periodic electrical inspections. In the first post, I discussed how often inspections should be carried out...

Photovoltaic (PV) Panel - Performance Modelling

In an earlier note on the site [Photovoltaic (PV) - Electrical Calculations], the theory of solar (PV) cell calculations was introduced.  In particular...

How to Calculate Motor Starting Time

Request to look at induction motor starting time have come up a few times on the site. Hopefully in this post, I give you guys some idea on how to calculate...

Power Transformers - An Introduction

One of the fundamental requirements of an alternating current distribution systems it to have the ability to change the magnitude of voltages.  It is more...

Cables for MV Power Distribution - Earthed versus Unearthed Systems

Power cables can basically be classified into earthed and unearthed cables, where earthed and unearthed refer to the application for which the cable is...

Copyright Infringement

myElectrical does not support or promote the use of copyrighted material without the copyright owner's consent. If you believe that material for which...

Maximum Demand for Buildings

Estimating maximum demand is a topic frequently discussed. Working out how much power to allow for a building can be very subjective . Allowing too much...

Laplace Transform

Laplace transforms and their inverse are a mathematical technique which allows us to solve differential equations, by primarily using algebraic methods...

How to Size Power Cable Duct

Some colleagues had an issue earlier in the week on sizing conduits to be cast in concrete for some power cables . It became clear that none of us had...

IEC 60287 Current Capacity of Cables - Rated Current

In the previous note we looked at the approach taken by the standard to the sizing of cables and illustrated this with an example.  We then looked at one...

Have some knowledge to share

If you have some expert knowledge or experience, why not consider sharing this with our community.  

By writing an electrical note, you will be educating our users and at the same time promoting your expertise within the engineering community.

To get started and understand our policy, you can read our How to Write an Electrical Note