IEC 60227-2:2003 pdf free download – Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V
3.1.1 General
The requirements are given in 5.6.3.1 of lEC 60227-1.
This test does not apply to tinsel cords, nor to single-core cables with flexible conductors forfixed wiring，nor to multi-core flexible cables having cores of nominal cross sectional areagreater than 2,5 mm2.
3.1.2 Apparatus
This test shall be carried out by means of the apparatus shown in figure 1.This apparatusconsists of a carrier C, a driving system for the carrier and four pulleys for each sample ofcable to be tested. The carrier C supports two pulleys A and B,which are of the ‘samediameter. The two fixed pulleys, at either end of the apparatus, may be of a different diameterfrom pulleys A and B, but all four pulleys shall be so arranged that the sample is horizontalbetween them.The carrier makes cycles (forward and backward movements) over a distanceof 1 m at an approximately constant speed of 0,33 m/s between each reversal of the directionof movement.
The pulleys shall be made of metal and have a semi-circular shaped groove for circular cablesand a flat groove for flat cables. The restraining clamps D shall be fixed so that the pull isalways applied by the weight from which the carrier is moving away. The distance from onerestraining clamp to its support, while the other clamp is resting on its support, shall be of 5 cmmaximum.
The driving system shall be such that the carrier turns smoothly and without jerks when itreverses from one direction to another.
3.5static flexibility test
The requirements are given in the specific parts of IEC 60227.
This test shall be applied to cables with conductor cross-sectional areas up to and including2,5 mm2.
Before the test, the cable shall be conditioned at(20 ± 5)°C for 24 h in a vertical position.
A sample with a length of (3 ±0,05) m shall be tested in an apparatus similar to that shown infigure 3.Two clamps，A and B, shall be located at a height of at least 1,5 m above groundlevel.
Clamp A shall be fixed and clamp B shall move horizontally at the level of clamp A.
The ends of the sample shall be clamped vertically (and remain vertical during the test), oneend in clamp A, the other in the movable clamp B which shall be at a distance i = 0,20 m fromclamp A.The cable takes roughly the shape indicated in figure 3 by the dotted lines.
The movable clamp B shall then be moved away from the fixed clamp A until the loop formedby the cable takes the shape, indicated in figure 3 by the continuous outline, of the U enclosedwholly between two plumb lines through the clamps and set up tangentially to the externalgeneratrix of the cable.This test shall be done twice, the cable being turned in the clamp, afterthe first test, through 180°.
The mean of the two values of /’ shall be measured between the two plumb lines.
lf the results of the test are unfavourable, the sample shall be preconditioned by winding it twotimes on and off a reel with a barrel diameter of approximately 20 times the smallest dimensionof the cable; after one winding the sample shall be turned through 180°. After thispreconditioning, the sample shall be subjected to the test described above and shall meet thespecified requirements.