Notes

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

, ,

More interesting Notes:
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

Are We Losing Professional Integrity

I have been thinking recently that there appears to be less professional integrity around than when I first started my career in electrical engineering...

Railway Electrification Voltages

This post is quick introduction and overview to different railway electrification voltages used in answer to a question sent in via email. While there...

Lead us, Warleader

Delum, who had watched all in silence, his face empty of expression, now spoke in turn. ' "Lead us, Warleader, into glory."' Reading is something I do...

Fault Calculations - Typical Equipment Parameters

A frequent problem in fault calculations is the obtaining of equipment parameters.  While it is always preferable to use the actual parameters of the equipment...

Electromechanical Relays

Electromechanical relays have been the traditional backbone of electrical protection systems.  While over recent years these have been replaced by microprocessor...

Introduction to Current Transformers

Current transformers (CTs) are used to convert high level currents to a smaller more reasonable level for use as inputs to protection relays and metering...

How a Digital Substation Works

Traditionally substations have used circuit breakers, current transformers (CT), voltage transformers (VT) and protection relays all wired together using...

Cable Sheath and Armour Loss

When sizing cables, the heat generated  by losses within any sheath or armour need to be evaluated. When significant, it becomes a factor to be considered...

Three Phase Power Simplified

A single phase system is perhaps the most common type of system most people are familiar with. This is what people have in their homes and what appliances...

Surface Treatment – Ladders, Trays and Baskets

Steel ladders, trays and baskets form the backbone of cable containment systems. Often these items need some form of surface treatment to prevent corrosion...

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. 

Footer
(click here to extend)
Copyright (c) 2019 myElectrical