View source for IEC 60228

{{Short description|Standard for conductors of insulated cables}}
{{Use British English Oxford spelling|date=December 2011}}
{{More citations needed|date=October 2014}}

'''IEC 60228''' is the [[International Electrotechnical Commission]] (IEC)'s [[international standard]] on ''conductors of insulated cables''. {{As of|2023}} the current version is Third Edition 2004-11<ref>{{cite web|url=https://webstore.iec.ch/publication/1065|date=2004|access-date=2020-05-15|title=IEC 60228:2004 - Conductors of insulated cables}}</ref>
Among other things, it defines a set of standard wire cross-sectional areas:
{{flatlist|indent=1|
* 0.5&nbsp;mm<sup>2</sup>
* 0.75&nbsp;mm<sup>2</sup>
* 1&nbsp;mm<sup>2</sup>
* 1.5&nbsp;mm<sup>2</sup>
* 2.5&nbsp;mm<sup>2</sup>
* 4&nbsp;mm<sup>2</sup>
* 6&nbsp;mm<sup>2</sup>
* 10&nbsp;mm<sup>2</sup>
* 16&nbsp;mm<sup>2</sup>
* 25&nbsp;mm<sup>2</sup>
* 35&nbsp;mm<sup>2</sup>
* 50&nbsp;mm<sup>2</sup>
* 70&nbsp;mm<sup>2</sup>
* 95&nbsp;mm<sup>2</sup>
* 120&nbsp;mm<sup>2</sup>
* 150&nbsp;mm<sup>2</sup>
* 185&nbsp;mm<sup>2</sup>
* 240&nbsp;mm<sup>2</sup>
* 300&nbsp;mm<sup>2</sup>
* 400&nbsp;mm<sup>2</sup>
* 500&nbsp;mm<sup>2</sup>
* 630&nbsp;mm<sup>2</sup>
* 800&nbsp;mm<sup>2</sup>
* 1000&nbsp;mm<sup>2</sup>
* 1200&nbsp;mm<sup>2</sup>
* 1400&nbsp;mm<sup>2</sup><ref group=note name=nps>Non-preferred size</ref>
* 1600&nbsp;mm<sup>2</sup>
* 1800&nbsp;mm<sup>2</sup><ref group=note name=nps/>
* 2000&nbsp;mm<sup>2</sup>
* 2500&nbsp;mm<sup>2</sup>
}}
{{comparison_wire_gauge_sizes.svg}}

In engineering applications, it is often most convenient to describe a [[wire]] in terms of its cross-section area, rather than its [[diameter]], because the cross section is directly proportional to its strength and weight, and inversely proportional to its [[Electrical resistance|resistance]]. The cross-sectional area is also related to the maximum [[current (electricity)|current]] that a metallic wire can carry safely.

This document is one considered ''fundamental'' in that it does not contain reference to any other standard.

==Description==
The document describes several aspects of the conductors for electrical cables

===Class===
This refers to the flexibility and thermal effects i.e temperature of a conductor.

* Class 1: Solid conductor
* Class 2: Stranded conductor intended for fixed installation 
* Class 5: Flexible conductor
* Class 6: Very Flexible conductor

===Size===
The ''nominal'' (see below) cross-sectional area for standard conductors including the following:
* Class 2: Minimum number of strands required to make particular conductor size
* Class 5 and 6: Maximum diameter of any component strand of the conductor

===Resistance===
The maximum permissible resistance per unit length (in ohms per kilometre – Ω/km) of each conductor size, class and type (both plain copper and metal coated)

==Purpose of the document==

This document and its precursors were created due to a need for a standard definition of cable conductor size. The main problem being that not all copper has the same resistivity value, so, for example, a 4&nbsp;mm<sup>2</sup> conductor from two different suppliers may have different resistance values. Instead this document describes conductors by their ''nominal'' size, determined by resistance rather than physical dimensions. This is a key distinction as it makes a standardized definition of conductors based solely on their electrical characteristics.

Almost all characteristics of conductors, resistance, current carrying capacity etc. are dependent on the physical dimensions of the conductor. However this document allows an easy reference whereby the standard conductor sizes and reference to physical dimensions are maintained but given an exact meaning in terms of the electrical characteristics of a conductor.

==Footnotes==
{{reflist|group=note}}

==See also==
* 
*[[Circular mil]], Unusual unit used as the North American Electrical industry standard for wires larger than 4/0.
*[[American wire gauge]] (AWG), used primarily in the US and Canada
*[[Standard wire gauge]] (SWG), the British imperial standard BS 3737, superseded by the metric.
*[[Stubs Iron Wire Gauge]]
*[[Jewelry wire gauge]]
*[[Body jewelry sizes]]
*[[Electrical wiring]]
*[[Number 8 wire]], a term used in the New Zealand vernacular

==References==
{{Reflist}}

== External links ==
{{List of IEC standards}}
* {{IEC|60228}}

[[Category:IEC standards|#60228]]
[[Category:Wire gauges]]


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