1、STD-BSI BS EN 50075-ENGL 1991 9 Lb2qbb9 079817L TI7 BRITISH STANDARD Specification for Flat non-wirable two-pole plugs, 2,5 A 250V, with cord, for the connection of class II-equipment for household and similar purposes The European Standard EN 50075 : 1990 has the status of a British Standard ICs 29
2、.120.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPRIGH LAW BS EN 50075 : 1991 ncorpomting Corrigendum No. 1 - STD=BSI BS EN 50075-ENGL 1991 I Lb2qbbS 0778172 773 loSi9 s after application of the voltage. The insulation resistance shall be not less than 5 m. The insulation resistanc
3、e is measured consecutively between: - the pins connected together and the body; - each pin in turn and the other, the latter being connected to the body. The term “body“ means a metal foil in contact with the outer surface of the plug, other than the engagement face and the insulating sleeves. Whil
4、e wrapping the metal foil round the outer surface, it is pressed against holes or grooves without any appreciable force by means of the straight unjointed test fmger, having the same dimensions as the standard test finger shown in figure 3. 11.2 A voltage of substantially sine-wave form, having a fr
5、equency of 50 Hz, is applied for 1 min between the parts indicated in 11.1 . The test voltage shall be 2000 v. Initially, not more than 1000 V is applied, then it is raised rapidly to the full 2000 V. No flashover or breakdown shall occur during the test. The high-voltage transformer used for the te
6、st shall be so designed that, when the output terminals are short-circuited after the output voltage has been adjusted to the appropriate test voltage, the output current is at least 200 mA. The overcurrent relay shall not trip when the output current is less than 100 mA. Care is taken that the r.m.
7、6. value of the test voltage applied is measured within f 3 %. Glow discharges without drop in voltage are neglected. STD*BSI BS EN 50075-ENGL 1991 W LbZlibbS 0798179 228 Page 6 EN 80075 : 1990 12 Flexible cords and their connection 12.1 Plugs shall be provided with a two-core cord complying with ei
8、ther HD 21.5 or HD 22.4. Flat tinsel cords and cords having a cross-sectional area of 0,5 mm2 are allowed in lengths up to 2 m only. A plug incorporated in a cord set is tested as specified in this standard and the connector is tested as specified in EN 60320, each device being tested individually.
9、Compliance is checked by inspection. 12.2 Moulded-on plugs shall be so designed that the cores of the cord are relieved from strain where they are connected to the terminations. Plugs other than moulded-on plugs, shall be provided with a cord anchorage such that the cores of the cord are relieved fr
10、om strain, including twisting, where they are connected to the terminations and that their insulation is protected from abrasion. The sheath, if any, of the cord shall be clamped within the cord anchorage. Compliance is checked by inspection and by the following test, made on new plugs of the second
11、 set. The plug is placed in a test apparatus as shown in figure 5 so that the axis of the cord is vertical where it enters the plug. The cord is then subjected 100 times to a pull of 50 N. The pulls are applied practically without jerks each time for 1 s. Immediately afterwards the cord is subjected
12、 for 1 min to a torque of - 0,l Nm if the cord connected has a nominal cross- sectional area of 0,5 mm2 - O, 15 Nm if the cord connected has a nominal cross-sectional area of 0,75 mm2 or more. Plugs with flat tinsel cords H03VH-Y are not subjected to this torque test. After the test, the cord shall
13、not have been displaced by more than 2 mm and there shall be no break in the electrical connections. For the measurement of the longitudinal displacement, a mark is made on the cord while it is subjected to the pull, at a distance approximately 2 cm from the end of the plug, before starting the test
14、s. If, for moulded-on plugs, there is no definite end to the plug, an additional mark is made on the body of the plug. After the tests, the displacement of the mark on the cord in relation to the plug, or to the mark on the plug, is measured while the cord is subjected to the pull. 12.3 Plugs shall
15、be so designed that the cord is protected against excessive bending where it enters the plug. Guards provided for this purpose shall be of insulating material and shall be fixed in a reliable manner. Helical metal springs, whether bare or covered with insulating material, shall not be used as cord g
16、uards. Compliance is checked by inspection and by a flexing test in an apparatus having an oscillating member similar to that shown in figure 6. The test is made on plugs of the third set. The plug is fixed to the oscillating member of the apparatus so that, when this is at the middle of its travel,
17、 the axis of the cord where it enters the plug, is vertical and passes through the axis of oscillation. Plugs with flat cords are mounted so that the major axis of the section is parallel to the axis of oscillation. The plug shall be xed in the test apparatus by its pins. The distance between the co
18、rd entry of the plug and the axis of oscillation is adjusted so that the weight makes the minimum lateral movement as the oscillating member moves over its fi111 travel. The cord is loaded with a mass so that the force applied is: - 10 N for plugs with cords having a nominal mss- sectional area of 0
19、,75 mm2 or less, - 20 N for plugs with other cords. A current of (2,5$42) A is passed through the conductors, the voltage between them being (250 f 15) V a.c. The oscillating member is moved backwards and forwards through an angle of 90“ (45“ on either side of the vertical), the number of flexings b
20、eing i0 O00 and the rate of flexing 60 per minute. A flexing is one movement, either backwards or forwards. Plugs with circular-section cords are turned through Wo in the oscillating member after 5 O00 flexings; plugs with flat cords are only bent in a direction perpendicular to the plane containing
21、 the axis of the cores. During the test, there shall be no interruption of the test current and no short-circuit between conductors. After the test, the plugs shall show no damage within the meaning of this standard, a guard, if any, shall not have separated from the body and the insulation of the c
22、ord shall show no sign of abrasion or wear and broken strands of the conductors shall not have pierced the insulation so as to become accessible. A short-circuit between the conductors of the cord is considered to occur if the current attains a value of 5 A. The voltage drop between a pin and the co
23、rresponding conductor shall not exceed 10 mV, when measured with a test current of: (l+$l) A for plugs with flat tinsel cord HOSVH-Y (2,5 T2) A for plugs with another cord. 13 Mechanicalstrength Plugs shall have adequate mechanical strength to withstand the stresses imposed during use. Compliance is
24、 checked by the tests of 13.1 and 13.4. 13.1 The plugs are pressed between two flat surfaces with a force of 150 N for 5 min, as shown in figure 7. Fifteen minutes after removal of the force, the plug shall not show such deformation as would result in undue alteration of those dimensions shown in St
25、andard Sheet 1 which ensure safety. 13.2 The plugs are tested in a tumbling barrel as shown in figure 8. The cod is cut so that a free length of approximately 100 mm projects from the plug or the outer end of the guard. The plugs fall from a height of 500 mm onto a steel plate, 3 mm thick, the numbe
26、r of falls being: - loo0 if the mass of the plug without the cord does not exceed 100 g, - 500 if the mass of the plug without the cord exceeds 100 g. The barrel is turned at a rate of approximately five revolutions per minute, ten falls per minute thus taking place. Plugs are tested individually in
27、 the tumbling bml. ARer the test, the plugs shall show no damage within the meaning of this standard. In particular: - no part shall have become detached or loosened, - the pins shall not have become 60 deformed that the plug cannot be introduced into the gauge of figure 2 and also fails to comply w
28、ith the requirements of clause 7 and 8.2, - the pins shall not turn when a torque of 0,4 Nm is applied, first in one direction for 1 min and then in the opposite direction for 1 min. During the examination afbr the test, special attention is paid to the connection of the cord. Small pieces may be br
29、oken off without causing rejection provided that the protection against electric shock is not affected. page7 EN 50075 : 1990 Damage to the nish and small denta which do not reduce the creepage distances and clearances below the values specified in clause 16 are neglected. 13.3 The pins are subjecte
30、d to the following test by means of an apparatus as ahown in figure 9. The test apparatus comprises a horizontally disposed beam, which is pivoted about its centre point. A short length of steel wire, (1 f 0,021 mm in diameter and bent into a U-shape, the base of the U being straight, is rigidly att
31、ached, at both ends, to one end of the beam, 80 that the straight part projects below the beam and is parallel to the axis of the beam pivot. The plug is held in a suitable clamp in such a position that the straight part of the steel wire rests on the plug pin, at right angles to it. The pin siOpes
32、downwards at an angle of between 5“ and 10“ to the horizontal. The beam is loaded 80 that the wire exerts a force of (4:,) N on the pin. The plug is caused to move backwards and forwards in a horizontal direction in the plane of the axis of the beam, so that the wire rubs along the pin. The length o
33、f pin thus abraded is approximately 9 mm, of which approximately 7 mm is over the insdating sleeve. The number of movements is 20 O00 (10 o00 in each direction) and the rate of operation is 25 to 30 movements per minute. The test is made on one pin of each plug. After the test, the pins shall show n
34、o darnage whch may affect safety or impair the further use of the plug, in particular, the insulating sleeve shall not have punctured or nicked up. 13.4 The plugs are placed on a rigid steel plate having two holes of (5,2 It 0,2) mm diameter at a centre distance of (18,6 f 0,3) mm, the pins inserted
35、 in the holes so that the engagement face of the plug rests on the plate. The test is made on plugs of the second set. A pull of (40+3 N is applied, without jerks, for (60+$ s on each pin in turn, in the direction of the longitudinal axis of the pin. The pull is applied within a heating cabinet at a
36、 temperature of (70 f 2) “C, (SO+: min after the plug has been placed in the heating cabinet. ARer the test, the plug is allowed to cool down to ambient temperature. Any pin shall not have displaced in the body of the plug more than 1 mm. 14 Resistance to heat and to ageing 14.1 Plugs shall be suffi
37、ciently resistant to heat. Compliance is checked by the tests of 14.1.1 and 14.1.2, as applicable. 14.1.1 Plugs other than moulded-on plugs, are kept for 1 h in a heating cabinet at a temperature of (100 f 2) OC. Page 8 EN 50076 : 1990 During the test, they shall not undergo any change impairing the
38、ir further use. After the test, the plugs are allowed to cool down to approximately room temperature. The marking shall still be legible. Discolouration or blisters are disregarded, provided that safety is not impaired within the meaning of this standard. 14.1.2 Plugs are subjected to a pressure tes
39、t by means of an apparatus similar to that shown in figure 10, the test being made in a heating cabinet at a temperature of (80 f 2) “C. The apparatus comprises two steel jaws, having a cylindrical face of approximately 25 mm radius, a width of (15 f 0,l) mm and a length of (50 * 0,3) mm. The corner
40、s are rounded with a radius of approximately 2,5 mm. The plug is clamped between the jaws in such a way that these press against it in the area where the plug is gripped in normal use, the centre line of the jaws coinciding as nearly as possible with the centre of this area. The force applied throug
41、h the jaws is (20+$ N. After (SO+$ min, the jaws are removed and the plugs shall show no damage within the meaning of this standard. I 14.2 Plugs shall be resistant to ageing. Compliance is checked by suspending plugs of the second set freely in a heating cabinet with an atmosphere having the compos
42、ition and pressure of the ambient air and ventilated by natural circulation. The temperature in the cabinet is (70 f 2) OC. The plugs are kept in the cabinet for 168 h. The use of an electrically heated cabinet is recommended. Natural circulation may be provided by holes in the walls of the cabinet.
43、 The plugs are then removed from the cabinet and kept at room temperature for at least 96 h. After the test, the plugs shall show no crack visible with normal or corrected vision without additional sticky or greasy, this being judged as follows. With the forefmger wrapped in a dry piece of rough clo
44、th the plug is pressed with a force of 5 N. No traces of the cloth shall remain on the plug and the material of the plug shall not stick to the cloth. ARer the test the plugs shall show no damage which would lead to non-compliance with this standard. I magnification, nor shall the material have beco
45、me The force of 5 N can be obtained in the following way: The plug is placed on one of the pans of a balance and the other pan is loaded with a mass equal to the mass of the plug plus 500 g. Equilibrium is then restored by pressing the plug with the forefinger wrapped in a dry piece of rough cloth.
46、16 Current-carrying parts and connections 15.1 Connections, electrical and mechanical , shall withstand the mechanical stresses occurring in normal use. Compliance is checked by inspection. 15.2 Electrical connections shall be so designed that contact pressure is not transmitted through insulating m
47、aterial, unless there is sufficient resiliency in the metallic parts to compensate for any possible shrinkage or yielding of the insulating material. This requirement does not preclude designs with flat tinsel cord H03VH-Y where the contact pressure is obtained from insulating parts having such prop
48、erties as to ensure reliable and permanent contact under all conditions of normal use, especially in view of shrinking, ageing or cold flow of the insulating part. Connections made by insulation piercing of fiat tinsel cord HO3VH-Y shall be reliable. Compliance is checked by inspection and, for the
49、last requirement by a test which is under consideration. The suitability of the material is considered in respect of the stability of the dimensions. 15.3 Current-carrying parts shall be either of: - copper, - an alloy containing at least 58 % copper for parts made from rolled sheet (in cold condition) or at least 50 % copper for other parts, or - other metals having a mechanical strength, an electrical conductivity and a resistance to corrosion adequate for their intended use. Currentcarrying parts which may be subjected to mechanical wear, shall not be made of steel provided with an el
