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IEC 60228
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IEC 60228 is the International Electrotechnical Commission's international standard on conductors of insulated cables.
Among other things, it defines a set of standard wire cross-sectional areas:
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 resistance.
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Encyclopedia
IEC 60228 is the International Electrotechnical Commission's international standard on conductors of insulated cables.
Among other things, it defines a set of standard wire cross-sectional areas:
| International standard wire sizes (IEC 60228) |
|---|
| 0.5 mm˛ | 0.75 mm˛ | 1 mm˛ | 1.5 mm˛ | 2.5 mm˛ | 4 mm˛ | | 6 mm˛ | 10 mm˛ | 16 mm˛ | 25 mm˛ | 35 mm˛ | 50 mm˛ | | 70 mm˛ | 95 mm˛ | 120 mm˛ | 150 mm˛ | 185 mm˛ | 240 mm˛ | | 300 mm˛ | 400 mm˛ | 500 mm˛ | 630 mm˛ | 800 mm˛ | 1000 mm˛ |
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 resistance. The cross-sectional area is also related to the maximum current that a wire can carry safely.
This document is one considered Fundamental in that it does not contain reference to any other standard.
Also Known As
This document is equivalent to:
Description
The document describes several aspects of the conductors for electrical cables
Class
This refers to the flexibility of a conductor
- Class 1: Solid conductor
- Class 2: stranded conductor intended for fixed instalation
- 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&6: Maximum diameter of any component strand of the conductor
Resistance
The required maximum resistance (in ohms/km)of each conductor size, class and type (both plain copper and metal coated)
Purpose of the document
History
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 4mm^2 conductor from two different suppliers may have different resistance values. Instead this document describes conductors by their nominal size.
Nominal Size
This is the size of a conductor determined by its resistance rather than its physical dimensions. This is a key distinction as it makes a standardised definition of conductors based solely on their electrical characteristics.
Almost all characteristics of conductors, resistance, current carrying capacity etc are independant of 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.
See also
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