EN 60335-2-68-2012 pdf download.Household and similar electrical appliances -Safety -Part 2-68: Particular requirements for spray extraction machines, for commercial use.
21.101 Those parts of the machine which are subjected to impact in normal use are tested as follows.
If failure of the pert subject to impact would cause a failure to comply with this specification, any spot of the machine which may be exposed during normal operation to impacts or blows shall be subjected to a single blow with an impact energy of 6,75 Nm. The impact stress on the freestanding machines shall be exerted by a steel sphere with a diameter of 50,8 mm and a mass of 0.535 kg dropped from a height of 1,3 m or hanging on a string acting as a pendulum, falling from a height of 1,3 m.
21.102 Current-carrying hoses shall be resistant to crushing Compliance is checked by the following test.
The hose is placed between two parallel steel plates each having a length of 100 mm, a width of 50 mm and the edges of the longer sides rounded with a radius of 1 mm. The axis of the hose is positioned at right angles to the longer sides of the plates. The plates are placed at a distance of approximately 350 mm from one end of the hose.
The steel plates are pressed together at a rate of 50 mm/mm ±5 mm/mm until the applied force is 1,5 kN. The force is then released and the electric strength test of 16.3 is carried out between the conductors connected together and the saline solution.
21.103 Current-carrying hoses shall be resistant to abrasion. Compliance is checked by the following test.
One end of the hose is attached to the connecting rod of the crank mechanism shown in Figure 102. The crank rotates at 30 revolutions per minute resulting in the end of the hose moving horizontally backwards and forwards over a distance of 300 mm.
The hose Is supported by a rotating smooth roller over which a belt of abrasive cloth moves at a speed of 0,1 rn/mm. The abrasive is corundum grit size P 100, as specified in ISO 6344-2.
A mass of 1 kg is suspended from the other end of the hose, which is guided to avoid rotation.
In the lowest position, the mass has a maximum distance of 600 mm from the centre of the roller.
The lest is carried out for 100 revolutions of the crank.
After the test, basic insulation shall not be exposed and the electric strength test of 16.3 is carried out between the conductors connected together and the saline solution.
21.104 Current-carrying hoses shaH be resistant to flexing. Compliance is checked by the following test.
The end of the hose intended to be connected to the motorized cleaning head is attached to the pivoting arm of the test equipment shown in Figure 103. The distance between the pivot axis of the arm and the point where the hose enters the rigid part is 300 mm .± 5 mm. The arm can be raised from the horizontal position by an angle of 400 .± 10. A mass of 5 kg is suspended from the other end of the hose or from a convenient point along the hose so that when the arm is in the horizontal position, the mass is supported and there is no tension on the hose.
NOTE It can be necessary to reposition the mass during the test.
The mass slides against an inclined plate so that the maximum deflection of the hose is 30
The arm is raised and lowered by means of a crank that rotates at a speed of 10 ± 1 rlmin.
The test is carried out for 2 500 revolutions of the crank after which the fixed end of the hose is turned through 90° and the test continued for a further 2 500 revolutions. The test is repeated in each of the other two 90° positions.
After 10 000 revolutions, the hose shall withstand the electric strength test of 16.3.
lithe hose ruptures before 10 000 revolutions are achieved, the flexing test is terminated. The hose shall still withstand the electric strength test of 16.3.EN 60335-2-68-2012 pdf download.