60RPM Flexing Test Household Appliance Test Equipment

Single Station Apparatus For Home Appliance Flexing Test PLC Control

Standard:

IEC 60335-1 Household and similar electrical appliances – Safety – Part 1: General requirements clause 23.3, clause 25.14 and figure 8, IEC 60335-2-23 Household and similar electrical appliances - Safety - Part 2-23: Particular requirements for appliances for skin or hair care clause 11.101

Application:
It is used to check that the supply cord of the small household appliances (such as Coffee pot / electric iron) and lamps is adequately protected against excessive flexing where it enters the appliance.

Test sample:
Small household appliances, such as coffee pot, electric iron, toaster, luminaires and etc.

Parameters:

Standard description:
IEC 60335-1 Clause 23.3:
Different parts of an appliance that can move relative to each other in normal use or during user maintenance shall not cause undue stress to electrical connections and internal conductors, including those providing earthing continuity. Flexible metallic tubes shall not cause damage to the insulation of the conductors contained within them. Open-coil springs shall not be used to protect the wiring. If a coiled spring, the turns of which touch one another, is used for this purpose, there shall be an adequate insulating lining in addition to the insulation of the conductors.

Compliance is checked by inspection and by the following test.

If flexing occurs in normal use, the appliance is placed in the normal position of use and is supplied at rated voltage and operated under normal operation .

The movable part is moved backwards and forwards, so that the conductor is flexed through the largest angle allowed by the construction, the rate of flexing being 30 per minute. The number of flexings is
−10 000, for conductors flexed during normal use;
−100, for conductors flexed during user maintenance .

The appliance shall not be damaged to the extent that compliance with this standard is impaired and it shall be fit for further use. In particular, the wiring and its connections shall withstand the electric strength test of 16.3, the test voltage being reduced to 1 000 V and
applied between live parts and accessible metal parts only. In addition, not more than 10 % of the strands of any conductor of the internal wiring between the main part of the appliance and the movable part shall be broken. However, if the wiring supplies circuits that consume no more than 15 W, then no more than 30 % of the strands shall be broken.

IEC 60335-1 Clause 25.14:
Appliances provided with a supply cord and that are moved while in operation shall be constructed so that the supply cord is adequately protected against excessive flexing where it enters the appliance.

Compliance is checked by the following test that is carried out on an apparatus having an oscillating member as shown in Figure 8.

The part of the appliance that includes the inlet opening is fixed to the oscillating member so that, when the supply cord is at the middle of its travel, the axis of the cord where it enters the cord guard or inlet is vertical and passes through the axis of oscillation. The major axis of the section of flat cords shall be parallel to the axis of oscillation.

The cord is loaded so that the force applied is
– 10 N, for cords having a nominal cross-sectional area exceeding 0,75 mm²;
– 5 N, for other cords.

The distance X, as shown in Figure 8, between the axis of oscillation and the point where the cord or cord guard enters the appliance, is adjusted so that when the oscillating member moves over its full range, the cord and load make the minimum lateral movement.
The oscillating member is moved through an angle of 90° (45° on either side of the vertical), the number of flexings for type Z attachments being 20 000 and for other attachments 10 000. The rate of flexing is 60 per minute.
The cord and its associated parts are turned through an angle of 90° after half the number of flexings, unless a flat cord is fitted.
During the test, the conductors are supplied at rated voltage and loaded with the rated current of the appliance. Current is not passed through the earthing conductor.

The test shall not result in
– a short circuit between the conductors, such that the current exceeds a value equal to twice the rated current of the appliance;
– a breakage of more than 10 % of the strands of any conductor;
– separation of the conductor from its terminal;
– loosening of any cord guard;
– damage to the cord or cord guard which could impair compliance with this standard;
– broken strands piercing the insulation and becoming accessible.

IEC 60335-2-23 Clause 11.101:

Appliances incorporating a swivel connection are positioned with their major axis horizontal, the supply cord hanging vertically. A pull force of 1 N is applied to the supply cord.

The appliance is supplied at rated voltage, the current being 1,25 times the rated current.

The appliance is rotated about its major axis at a rate of approximately 50 r/min, the direction of rotation being reversed every 20 revolutions. The test is carried out for 1 500 revolutions.

The temperature rise of the sliding contacts shall not exceed 65 K.

IEC 60335-2-23 Clause 25.101:

Swivel connections shall be adequate for normal use of the appliance.

Compliance is checked by the following test.

The appliance is operated under the conditions specified in 11.101, the number of revolutions being increased to 20 000.

After this test, the swivel connection and the supply cord shall be fit for further use. Live parts shall not have become accessible and the appliance shall withstand the electric strength test of 16.3.

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