ISO 13832:2013

INTERNATIONAL ISO
STANDARD 13832
First edition
2013-03-15
Aerospace — Wire, aluminium alloy and
copper-clad aluminium conductors —
General performance requirements
Aéronautique et espace — Conducteurs en alliage d’aluminium chemisé
cuivre pour câbles électriques — Exigences générales de performance
Reference number
©
ISO 2013
© ISO 2013
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ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Characteristics . 2
4.1 General . 2
4.2 Conductor materials . 2
4.3 Material and metal plating for individual strands and code . 2
4.4 Electrical and mechanical characteristics . 2
4.5 Construction of conductors . 3
5 Tests and requirements . 3
5.1 Tensile strength and elongation . 3
5.2 Mass per unit length . 3
5.3 Resistance . 4
5.4 Strand-plating continuity . 4
5.5 Strand-plating adherence . 4
5.6 Strand-plating thickness . 4
6 Packaging and labelling . 5
6.1 Packaging . 5
6.2 Designation and labelling . 5
Bibliography .11
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
The committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 1, Aerospace electrical requirements.
iv © ISO 2013 – All rights reserved

Introduction
This International Standard is the general performance requirements of the wires with aluminium and
copper-clad aluminium conductors for aerospace.
The need for International Standardization in the Aerospace industry cannot be overemphasized.
Multinational projects abound in the construction industry and all major airlines use equipment produced
in different continents. The mixture of specifications and standards combine to increase the chances
of maintenance errors, no more so than in the interconnection system. Power plant manufacturers
in France may use conductors and terminations manufactured in Europe mating at the firewall with
terminations and conductors manufactured in North America. This can result in different contacts,
crimp tools and settings, and insulating stripping tools being required to work on mating connectors.
The same would apply to many types of equipment.
The requirement for close or “clipped” tolerance, lightweight conductors can provide the opportunity
to address many of these problems by overcoming the long-standing issue of AWG versus metric sizes.
This International Standard introduces a list of aluminium-based lightweight conductors for aerospace
cables. This list supplements the existing list of standard metric conductors which has not received
worldwide acceptance. The list is derived from EN 3719, prEN 4651 and MIL-W-7072(MS25191).
The constructions presented are those which are considered to be standards within the emerging
rules governing aircraft cables, e.g. seven strands minimum, copper-clad aluminium for size 22 and
smaller. However, it does take advantage of the lightest weight for each size. The resultant standard is
therefore a mixture of conductors with metric and imperial origins which gives the greatest advantage
to constructors and users for the future.
This International Standard:
— obeys existing rules regarding conductors for aircraft;
— gives the lightest weight for each size/rating currently used;
— standardizes the conductor cross-sectional area throughout the world aerospace industry;
— enables the standardization of terminations and the crimp tools used to produce the joints;
— reduces the number of insulation stripping tools required to service aircraft;
— enables the world industry to concentrate its efforts on improving interconnection technology
knowing that a world market exists;
— enables regulatory authorities (CAA, FAA, JAA, etc.) to make rules regarding the interconnection
system which applies internationally.
All these will, by reducing complexity, reduce servicing errors and contribute to aircraft safety.
INTERNATIONAL STANDARD ISO 13832:2013(E)
Aerospace — Wire, aluminium alloy and copper-
clad aluminium conductors — General performance
requirements
1 Scope
This International Standard specifies the dimensions, electrical characteristics and mechanical
characteristics of aluminium-based and copper-clad aluminium (CCA) conductors, for lightweight
aircraft electrical cables and aerospace applications. It applies to stranded conductors over the nominal
2 2
cross-sectional area range 0,22 mm to 107 mm inclusive.
It is not applicable to conductors for conventional copper-based cables, fire-resistant cables or for
thermocouple extension cables. Conductors for copper-based cables are specified in ISO 2635, for fire-
resistant cables are specified in ISO 1967 and for thermocouple extension cables are specified in ISO 8056-1.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ASTM B 566, Standard Specification for Copper-Clad Aluminum Wire
ISO 8815, Aircraft — Electrical cables and cable harnesses — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8815 and the following apply.
3.1
conductor code
numeric or alphanumeric code which designates conductor size and properties
[SOURCE: ISO 2635:2003, 3.1]
3.2
worldwide wire gauge
WWG
identification system, similar to the American wire gauge (AWG) system from which it has been derived,
for an international designation of wire cable sizes
[SOURCE: ISO 2635:2003, 3.2]
3.3
copper-clad aluminium
CCA
wire per ASTM B 566 class 15A which consists of an aluminium core with a continuous cladding of
copper thoroughly bonded to the core throughout
Note 1 to entry: See Figure 2.
4 Characteristics
4.1 General
The dimensions, electrical resistance, mechanical properties and mass of the conductors shall conform
to the values given in Table 5 for CCA wires and Table 6 for aluminium or aluminium alloy wires. The
shapes of conductors stranded in concentric lay, bunch or rope lay are illustrated in Figure 1. The wires
shall consist of stranded CCA, aluminium or aluminium alloy strands shown in Figure 2.
4.2 Conductor materials
The conductors in accordance with this standard of nominal cross-sectional area 0,25 mm (code 002)
to 0,40 mm (code 004) shall be produced from a 1 + 6 strands construction. The central strand is a
copper alloy strand or equivalent in ISO 2635, surrounded by six CCA strands (see Figure 1).
The conductors shall consist of individual CCA strands (see ASTM B 566 class 15A), aluminium strands
or aluminium alloy strands with the following composition, for cross-sections of greater than 0,25 mm :
For aluminium: Annealed aluminium (EC grade 99,5 %). See Table 1.
For copper: ETP(Electrolytic touch pitch) copper purity 99,9 % min.
For aluminium alloy: See Table 2.
The conductors shall be manufactured from unused materials that have been exposed only to processes
essential to their manufacture and application.
4.3 Material and metal plating for individual strands and code
The individual strands may be:
— uncoated CCA (code A);
— CCA with tin plating (code B);
— CCA with silver plating (code C);
— CCA with nickel plating (code D);
— pure aluminium (code E);
— aluminium alloy with nickel plating (code F)
Plating thicknesses shall be at least 1,0 μm for code C and according to Table 3 for code D.
4.4 Electrical and mechanical characteristics
−8 −8
The maximum resistivity at 20 °C shall be 2,78 × 10 Ω·m for CCA and 3,0 × 10 Ω·m for aluminium or
aluminium alloy.
The elongation at rupture on the complete conductor taken from the finished wire shall be ≥ 6 %.
The tensile strength of the complete conductor taken from the finished wire shall be at least 138 MPa
2 2
(138 N/mm ) for CCA and 105 MPa (105 N/mm ) for aluminium or aluminium alloy.
The elastic limit (at 0,2 % wire elongation) of the complete conductor taken from the finished wire shall
be at least 90 MPa (90 N/mm ) for CCA.
2 © ISO 2013 – All rights reserved

4.5 Construction of conductors
4.5.1 Lay length
For CCA conductor up to 5 mm cross-section inclusive (code 050), concentric conductors are used. The
length of lay of the strands of a concentric conductor, checked over the outside laye
...