IEC 61232 Aluminium-clad steel wires tension, torsion wrapping test This International Standard applies to bare, hard-drawn, round, aluminium-clad steel wires of different electrical and mechanical properties, in the diameter ranges shown in table 5, for electrical purposes, before stranding.It is inten

ded to cover applications, for reinforcement in aluminium conductors and for all aluminium-clad steel stranded conductors.

Tensile test

The breaking load of the specimen shall be determined by means of a suitable tensile test-.ing machine. The load shall be applied gradually and the rate of separation of the jaws ofthe testing machine shall be not less than 25 mm per minute and not greater than 100 mmper minute.

In calculating the tensile stress from the measured breaking load, the diameter of thefinished wire before stressing shall be used.

Torsion test

One specimen shall be gripped at its ends in two vices with the distance between vicesequivalent to 100 times the nominal wire diameter, one of which shall be free to movelongitudinally during the test. A small tensile load, not exceeding 2 % of the breakingstrength of the wire, shall be applied to the sample during testing.

The specimen shall be twisted by causing one of the vices to revolve until fracture occursand the number of twists shall be indicated by a counter or other suitable device.

The rate of twisting shall not exceed 60 rev/min.