The flexing test made by means of an apparatus as shown in figure 21.
The specimen is fixed to the oscillating member of the apparatus so that, when it is at the middle of its travel, the axis of the flexible cable, where it enters the specimen, is vertical and passes through the axis of oscillation.
Specimens with flat cords are mounted so that the major axis of the section is parallel to the axis of oscillation.
The accessory shall be fixed in the test apparatus in the following way:
– plugs: by the pins;
– portable socket-outlets: at a distance of 4 mm to 5 mm in the direction of the flexible cable, from the engagement face; a test plug having the maximum dimensions shall be inserted in the portable socket-outlet during the test.
The accessory is, by variation of the distance between the fixing part of the oscillating member and the axis of oscillation, positioned so that the flexible cable makes the minimum lateral movement when the oscillating member of the test apparatus is moved over its full travel.
The flexible cable is loaded with the load specified in this clause and the current specified in this clause is passed through the cable.
The voltage between the conductors is equal to the rated voltage of the specimen.
The oscillating member is moved through an angle of 90° (45° on either side of the vertical), the number of flexings being 10 000 and the rate of flexing 60/min.
Specimens with circular section flexible cables are turned through 90° in the oscillating member after 5 000 flexings; specimens with flat flexible cables are only bent in a direction perpendicular to the plane containing the axes of the conductors.
During the flexing test, there shall be
– no interruption of the current,
– no short circuit between conductors.
After the test, the guard, if any, shall not have separated from the body and the insulation of the flexible cable shall show no sign of abrasion or wear; broken strands of the conductors shall not have pierced the insulation so far as to become accessible.
|Power Supply||220 V, 50 Hz or 115 V, 60 Hz|
|Number of Flexing||1 – 999999 (adjustable)|
|Flexing Rate||10 ~ 60/min|
|Flexing Angle||Flexing with either line 45°, 60°, or 90° (or 180°) (optional)|
|Loads||10 N/20 N x 6 (UL113g and 284g)|
|Dimensions||(WxLxH) 500 mm x 1000 mm x 1100 mm|
|Standards||IEC 60884-1, EN/IEC 320-1, VDE 0620-1|
|Drive Method||The crank block in the reduction gear is driven by an electric motor to achieve mutual motion.|