The jointless copper low-alloyed and bronze contact wires are issued according to GOST 2584-75. Wires are produced by shaped round and shaped oval.
The low-alloyed contact wires have to have in top is frequent sections a distinctive flute strictly on a vertical axis of a wire. Construction lengths of wires depending on section make 1000 — 5500 m.
Copper contact wires have to be produced from the rod iron received by method of continuous molding and rolling with the light surface which is not demanding the subsequent etching. Brands of shaped and shaped oval wires are established depending on a chemical composition. So, the shaped low-alloyed wire with additive of 0,05% Mg is designated as Elmg0,05f, from 0,05% of Zr — Nltsr0,05f, etc. As additives for the low-alloyed contact wires Mg (0,04 — 0,06%), Zr (0,04 — 0,06%), Sn (0,03 — 0,06%), Si (0,03 — 0,06%), Ti are used (0,0 i — 0,04%), the Alloying copper components for bronze contact wires are Mg (0,10 — 0,30%), Cd (0,8 — 1,1%), Zr (0,1 — 0,6%). Specific electric resistance of wires to a direct current at 20 OS has to be no more than 0,017 Om*m for copper wires, 0,0185 — for low-alloyed, 0,0205 — for wires from cadmic bronze, 0,0220 — from magnesian bronze, 0,0200 — from zirconium bronze, 0,0215 — from magnesium-zirconium bronze.