EN 50149-2012 pdf download.Railway applications – Fixed installations -Electric traction -Copper and copper alloy grooved contact wires.
This requirement shall be tested in accordance with 5.5.5 subject to agreement between purchaser and manufacturer.
NOTE This problem appears mainly in high strength copper alloys (minimum tensile strength > 400 MPa).
4.8 Joining drawing stock or intermediate rod stock
Joins are allowed except where specified otherwise by the customer.
The type of join shall be agreed with the customer.
The join shall be made only on the drawing stocks or intermediate wire rod stocks.
5 Checking the characteristics of wires
5.1 Material composition
The manufacturer shall submit a certificate to confirm the material composition is in accordance with Annex B
or the requirements agreed between purchaser and manufacturer.
5.2 Appearance and condition
The wire together with each sample which is subjected to other tests identified In this standard shall be examined with the naked eye (corrected to normal vision). The appearance shall comply with the requirements of 4.3.
5.3 Profiles and dimensions
Dimensional examination shall be performed either using a suitable micrometer or sliding calliper, or using a
profile reflector with a minimum amplification of 10, or other appropriate methods.
5.4 Electrical properties
The resistivity or resistance per unit length measurements shall be made in conformity with IEC 60468:1974. The results shall be in accordance with 4.6.1 or 4.6.2 as appropriate.
NOTE I The coefficient of temperature for the measurement of resistance at temperatures other than shown in 4.6,1
and 46.2 should be:
For copper (Cu-ETP. hard drawn): 3,8 x 103/K For copper with silver (CuAgO,1): 3,8 x 1031K
For copper with magnesium (CuMgO,2, 3,1 x i0/K
CuMgO,2 high conductivity):
For copper with magnesium (CuMgO.5): 2.7 x i0K
For copper with tin (CuSnO,2, CuSnO,2 3,2 x 103/K
high conductivity):
For other copper alloys the values should be as agreed between purchaser and manufacturer.
NOTE 2 In a temperature range from —50 C up to 100 C the coefficient of temperature for the resistance is constant. For this application of measurement of electrical properties, definition of temperature range is not necessary.
NOTE 3 Values are only a recommendation. Deviations may arise from different chemical compositions and manufacturing methods.
5.5 Mechanical properties
5.5.1 Breaking load and percentage elongation after fracture
This test Is performed in accordance with the requirements of EN ISO 6892-1. The gauge length for percentage elongation measurement shall be 200 mm.
The original cross sectional area is calculated from the measured mass per unit length and the density appropriate to the material specified (see C.6). Values shall be in accordance with 4.7.1 –
For the test on joined wire, the requirements of 4.7 and 4.8 shall be noted, and the tensile tests shall be carried out as follows:
– if the length in the joined wire is less than or equal to the length between reference marks, the join shall be placed at the middle of the reference marks;
– if the length of the join is greater than the length between reference marks, the method of testing shall be agreed between the customer and manufacturer.
5.5.2 Reverse bend test
This test is optional and shall be carried out if requested by the purchaser. The test is performed using a method similar to that shown in ISO 7801:1984 and Figure 8. The Distance from the top tangential plane of q4indrical supports to the bottom face of the guide shall be 200 mm max. The wire has to be placed so that the bottom and the head of the wire are tangential to the gripping faces of the support (as shown in Figure 9). For the first bending the bottom of the wire has to be inside and the head of the wire outside.
The wire shall be subjected to a number of bends, through 90 in opposite directions, around a mandrel with a radius of 30 mm. One bend consists of bending the free end of the test specimen through 90 and returning it to its original position, in accordance with Figure 9. The bends may be made by hand.
The wire shall withstand a minimum of 6 bends without comp’ete fracture.EN 50149-2012 pdf download.