BS EN 3719-2005 pdf download.Aluminium or aluminlum alloy conductors for electrical cables Product standard.
This BS EN 3719 specifies the dimensions, linear resistance, mechanical characteristics, construction and mass of conductors in aluminium or aluminium alloy for electrical cables for aerospace applications.
It applies to stranded conductors with nominal cross-sections of 5 mm2 to 107 mm2 inclusive.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 3475-100, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 100: General.
EN 3475-301, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 301: Ohmic
resistance per unit length
3 Terms, definitions and symbols
For the purposes of this document, the terms, definitions and symbols given in EN 3475-100 apply.
4 Conductor materials and construction
4.1 Materials
The conductors in accordance with this standard shall consist of individual annealed aluminium (EC grade 99,7 % AL) or aluminium alloy strands with the following composition defined in Table 1
aluminium alloy with tin plating (code B):
— aluminium alloy with silver plating (code C);
— aluminium alloy with nickel plating (code D)
Plating thickness shall be at least 1,0 pm for silve and 1,2 pm for nickel.
When tin plating Is authorized, the thickness shall be sufficient to comply with the tests specified in
EN 3475-100.
4.3 Aluminium or aluminium alloy
The maximum resistivity shall be: 3,0 x 10 ]m )
The elongation at rupture for each individual strand shall be  6 %.
The tensile strength of each individual strand shall be at least 125 MPa
4.4 Construction of conductors
4.4.1 Lay length
Up to 9 mm2 cross-section Indusive (code 090), concentric conductors are used. The lay for the strands of a concentric conductor, checked over the outside layer of a test piece I m long, shall be between eight times and 16 times the maximum diameter of this conductor.
For sectional areas between 14 mm2 and 107 mm2 (codes 140 to 107), the conductor comprises concentric or bunched conductors twisted together. The lay of the strands for the basic concentric or bunched condtictors shall not exceed 30 times the diameter of the concentric or bunched conductor in question.
The lay for concentric (or bunched) conductors, measured over the outer layer of the conductor, shall be between eight times and 16 times the maximum conductor diameter.
In all cases the lay of the outer layer shall be left-hand.
4.4.2 Joints
The conductors shall be free from any joints. Each strand comprising the conductors may, however, include soldered or brazed joints. For strands with a diameter of 0,25 mm or greater, butt joints shall be used. The distance between two joints in individual strands shall exceed 3 m, measured between different strands.
8 Marking, packaging and delivery lengths
On delivery the identification reference shall be completed by the length, date and inspection mark.
The conductors shall be delivered on spools or ree’s.
They shall be wound in a regular and uniform manner and require an appropriate protection, not affecting the product delivered.
Each unit delivered may contain one or several lengths as specified by the purchaser.BS EN 3719-2005 pdf download.