Manual Operation Cold Bend Test Apparatus For Cables External
Diameter Less Than 12.5mm
8.1 Bending test at low temperature for insulations
8.1.1 General
This test is intended in general for cores of circular
cross-section having an external diameter up to and including 12.5
mm and for sector-shaped cores when it is not possible to prepare
dumb-bells. Cable Testing Equipment
If required by the standard for the type of cable, the test shall
be carried out on larger cores. Otherwise, the insulation of larger
cores shall be subjected to the elongation test described in
Sub-clause 8.3.
8.1.2 Sampling and preparation of test pieces
Each core to be tested shall be represented by two samples of
suitable length. After removal of the coverings, if any, the
samples shall be used as test pieces. Cable Testing Equipment
8.1.3 Apparatus
The apparatus recommended for this test is represented in Figure 1,
page 20, with explanations. It consists essentially of one
revolving mandrel and guiding devices for the test pieces. Cable Testing Equipment
Other single-mandrel apparatus, substantially equivalent to the one
represented in Figure 1, may also be used.
The apparatus shall be held in a suitable low temperature cabinet
before and during the test.
Standard:IEC60811-1-4 clause 8.1 and 8.2, common test methods for insulating
and sheathing materials of electric and optical cables-part
1-4:Methods for general application-Test at low temperature.
Application:This test is intended in general for cables with an overall
diameter up to and including 12.5 mm, or for flat cables, a major
axis dimension up to and including 20 mm. Cable Testing Equipment
Test sample:Cables with an overall diameter up to and including 12.5 mm, or for
flat cables, a major axis dimension up to and including 20 mm.
Feature:Made of stainless steel, 2 stations,equip with the extended handle
which can be connected to the outside of the low temperature
chamber.
Parameters:
Station:2
Diameter of samples:Φ2.5mm ～12.5mm Cable Testing Equipment
The number of turns:2 to 10 turns, and the number of turns shall be
as specified in the following table:
| Overall diameter (d) of the test piece (mm) | Number of turns |
| D≤2.5 | 10 |
| 2.5﹤d≤4.5 | 6 |
| 4.5﹤d≤6.5 | 4 |
| 6.5﹤d≤8.5 | 3 |
| 8.5﹤d | 2 |
Test condition: The diameter of the mandrel shall be between 4 and
5 times the diameter of the test piece. Standard equip with the
mandrel :Ф4,Ф5,Ф6,Ф7,Ф8,Ф10,Ф12,Ф14,Ф16,Ф18,Ф20,Ф24,Ф37.5mm
Rotation speed: 5S/ turn, manual control Cable Testing Equipment
Diameter of pipe: Ф3.5,Ф6,Ф10,Ф12,Ф16mm, each of two pieces
Picture for reference:
