GB/T 25087-2010Road vehicles -- Round, screened and unscreened 60V and 600V multi-core sheathed cables (English PDF)

4.3 Tests

The cables shall be submitted to the tests as specified in Table 1.

4.4 General test conditions

According to 4.4 of GB/T 25085-2010.

4.5 Ovens

According to 4.5 of GB/T 25085-2010.

4.6 Visual appearance

On visual examination, the sheath shall be smooth, even and free from surface imperfections, such as lumps, voids, particles, or other imperfections.

5.1 General

Due to the variety of constructions, the requirements for dimensions shall be established by agreement between the customer and supplier (see 5.2.4, 5.3.5 and 5.4.4).

5.2 Outside cable diameter

5.2.1 Test sample

Follow 5.1.1 of GB/T 25085-2010.

5.2.2 Apparatus

Follow 5.1.2 of GB/T 25085-2010.

5.4.1 Test samples

Follow 5.2.1 of GB/T 25085-2010.

5.4.2 Apparatus

Follow 5.2.2 of GB/T 25085-2010.

5.4.3 Procedure

Follow 5.2.3 of GB/T 25085-2010.

5.4.4 Requirement

The thickness of the sheath shall be within the limits established by agreement between the customer and supplier.

6.1 Continuity

6.1.1 Test sample

Remove 100 mm of sheath from each end of a complete cable and 25 mm of insulation from each end of the cores.

6.1.2 Apparatus

Use an appropriate source connected in series with an indicator such as an ohmmeter, light or buzzer.

6.1.3 Procedure

Connect the apparatus to one of the cores. Repeat the procedure until all cores have been tested. If a screen is present, test the continuity using the same procedure for a core. As an alternative, all of the cores shall be tested at once, by connecting them in series. Take care to select a current which shall not damage the individual conductors.

6.1.4 Requirement

The indicator shall show continuity.

6.2 Withstand voltage

6.2.1 Test sample

Remove 100 mm of sheath from one end of the cable and remove 25 mm of

6.3.3 Line injection method

Allowable frequency ranges according to “Surface transfer impedance, Line injection method” of GB/T 17737.1.

6.3.3.1 Test sample

Follow “Surface transfer impedance, Line injection method” of GB/T 17737.1.

6.3.3.2 Apparatus

Follow “Surface transfer impedance, Line injection method” of GB/T 17737.1.

6.3.3.3 Procedure

Follow “Surface transfer impedance, Line injection method” of GB/T 17737.1.

6.3.3.4 Requirements

The requirements for surface transfer impedance shall be established by agreement between the customer and supplier.

6.3.4 Tri-axial method

Allowable frequency ranges according to “Surface transfer impedance, Tri-axial method” of GB/T 17737.1.

6.3.4.1 Test sample

Follow “Surface transfer impedance, Tri-axial method” of GB/T 17737.1.

6.3.4.2 Apparatus

Follow “Surface transfer impedance, Tri-axial method” of GB/T 17737.1.

6.3.4.3 Procedure

Follow “Surface transfer impedance, Tri-axial method” of GB/T 17737.1.

6.3.4.4 Requirements

The requirements for surface transfer impedance shall be established by agreement between the customer and supplier.

6.3.5 Absorbing clamp method

Allowable frequency ranges according to “Screening attenuation, Absorbing clamp method” of GB/T 17737.1.

6.3.5.1 Test sample

deformation. Omit the withstand-voltage test.

7.1.4 Requirement

For basic performance cables, the thickness within the area of the impression shall not be less than 40 % of the mean of the other two values.

For high-performance cables, the thickness within the area of the impression shall not be less than 60 % of the mean of the other two values.

7.2 Adhesion of sheath

7.2.1 Test usage

The usage of this test shall be established by agreement between the customer and supplier.

7.2.2 Test sample

Follow 7.2.2 of GB/T 25085-2010. Prepare three test samples of 150 mm from a cable sample that is 3 m in length. Take the test samples at 1 m intervals. The undisturbed length of sheath shall be 100 mm.

7.2.3 Apparatus

Follow 7.2.3 of GB/T 25085-2010. A metal plate is provided with a round hole equal to the approximate inside diameter of the sheath.

7.2.4 Procedure

Follow 7.2.4 of GB/T 25085-2010. If the 100 mm section of sheath buckles when sliding, prepare new test samples with the undisturbed length of sheath equal to 50 mm, and repeat the procedure.

7.2.5 Requirements

The undisturbed section of sheath shall be able to be removed without damage to the interior cores. The strip force shall be within the limits established by agreement between the customer and supplier.

7.3 Cyclic bending

7.3.1 Test usage

The usage of this test shall be established by agreement between the customer and supplier.

7.3.5 Requirement

The requirement(s) for the cyclic bending shall be established by agreement between the customer and supplier.

8.1 Winding

8.1.1 Test sample

Follow 8.1.1 of GB/T 25085-2010. Remove 100 mm of sheath from one end of the cable and remove 25 mm of insulation from each core.

8.1.2 Apparatus

Follow 8.1.2 of GB/T 25085-2010. A freezing chamber at (-40 ± 2)°C [(-25 ±

2)°C may be used when agreed between the customer and supplier]. See Table

2 for the mandrel diameter.

Table 2 Outside cable diameter, mandrel diameter and mass, and winding around the mandrel

Outside cable diameter

D mm

Mandrel diameter

Mass, if rotating mandrel is used kg

Winding: minimum number of turns around the mandrel

D <=2.5

<= 5 times the outside cable diameter

0.5 3

2.5<D<= 5 2.5 3

5<D <=10 5 2

10<D <= 15 10 0.5

15<D <= 25 20 0.5

25<D 30 0.5

8.1.3 Procedure

Follow 8.1.3 of GB/T 25085-2010.

For this test, apply a winding speed of 0.2 r/s (revolutions per second) for all cable sizes and a number of turns according to Table 2. After winding, the outer sheath shall be visually examined. If there is no sign of cracks in the sheath, perform the withstand-voltage test as in 6.2.

If required by the customer, strip the sheath without damage to the inner cores, visually examine them, and if there is no sign of cracks, perform a 1 kV a.c.

withstand-voltage test with the separate cores as in GB/T 25085-2010.

8.1.4 Requirements

5 - Bracket

6 - Tape supporting pin, diameter = 6.9 mm

7 - 80 J, garnet-sandpaper abrasion tape

Figure 2 Apparatus for “sandpaper abrasion”

9.4 Procedure

Mount the cable in a horizontal position as shown in Figure 2. Use an area of the abrasion tape not previously used. Place the mass and bracket on top of the cable. Draw the sandpaper under the specimen at a rate of (1500 ± 75) mm/min, and record the length of sandpaper necessary to expose a conductor or screen. Move the test sample 20 mm and rotate the test sample clockwise by 90°. Repeat the procedure for a total of 4 readings. The mean of the readings shall determine the resistance to abrasion.

9.5 Requirement

The resistance to abrasion shall meet or exceed the limits established by agreement between the customer and supplier.

10.1 Long-term ageing, 3 000 h

10.1.1 Purpose

This test is intended to confirm the temperature-class rating.

10.1.2 Test samples

Follow 10.1.2 of GB/T 25085-2010. Remove 25 mm of sheath from each end of the cable.

10.1.3 Apparatus

Follow 10.1.3 of GB/T 25085-2010. See Table 2 for the mandrel diameter and mass.

10.1.4 Procedure

Follow 10.1.4 of GB/T 25085-2010. After winding, visually examine the outer sheath. If there is no sign of cracks in the sheath, perform the withstand-voltage test as in 6.2.

If required by the customer, strip the sheath without damage to the inner cores, visually examine them, and if there is no sign of cracks, perform a 1 kV a.c.

10.3.3 Apparatus

Follow 10.3.3 of GB/T 25085-2010. See Table 2 for the mandrel diameter and mass.

10.3.4 Procedure

Follow 10.3.4 of GB/T 25085-2010. After winding, visually examine the outer sheath. If there is no sign of cracks in the sheath, perform the withstand-voltage test according to 6.2.

If required by the customer, strip the sheaths without damage to the inner cores, visually examine them, and if there is no sign of cracks, perform a 1 kV a.c.

withstand-voltage test with the separate cores as in GB/T 25085-2010.

10.3.5 Requirements

Follow 10.3.5 of GB/T 25085-2010. The test samples shall show no signs of cracks. Breakdown shall not occur during the different withstand-voltage tests.

10.4 Shrinkage caused by heating the sheath

10.4.1 Test sample

Prepare three test samples of 200 mm length.

10.4.2 Apparatus

Follow 10.4.2 of GB/T 25085-2010.

10.4.3 Procedure

Follow 10.4.3 of GB/T 25085-2010. Measure the shrinkage of the sheath.

10.4.4 Requirement

The requirement shall be as agreed between the customer and supplier.

11.1 Fluid compatibility of sheath

11.1.1 Test samples

Follow 11.2.2.1 of GB/T 25085-2010.

11.1.2 Apparatus

Follow 11.2.2.2 of GB/T 25085-2010. During immersion, the bend diameter of and supplier.

11.4.2 Test samples

Prepare two samples, each of approximately 600 mm length.

11.4.3 Apparatus

Follow 11.6.3 of GB/T 25085-2010 for the test chamber. See Table 2 for the mandrel diameter.

11.4.4 Procedure

Wind samples equal to or less than 10 mm in diameter 3 turns, and samples greater than 10 mm half a turn, around the mandrel and secure the ends. See

GB/T 25085-2010 for the procedure to condition the test samples. Make a visual examination of the sheath. Ignore any damage caused by the clamps which secure the ends.

11.4.5 Requirements

The test samples shall show no cracks.

12.1 Test sample

Follow 12.1 of GB/T 25085-2010.

12.2 Apparatus

Follow 12.2 of GB/T 25085-2010.

12.3 Procedure

Follow 12.3 of GB/T 25085-2010. Apply the flame for 30 s for all cables.

12.4 Requirement

Follow 12.4 of GB/T 25085-2010.