EN IEC 62677-2 pdf free download

EN IEC 62677-2 pdf free download.Heat shrinkable low and medium voltage moulded shapes – Part 2 Methods of test.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
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4 Test conditions
4.1 Unless otherwise specified, all tests shall be made under standard ambient conditions according to IEC 60212, that is at a temperature between 15 °C and 35 °C and at ambient relative humidity.
In cases of dispute, the tests shall be carried out at a temperature of 23 °C ± 2 K and at (50 ± 5) % relative humidity.
4.2 When heating at elevated temperature is specified for a test procedure, the specimen shall be maintained for the prescribed period in a uniformly heated oven complying with either
IEC 60216-4-1 or IEC 60216-4-2.
4.3 Where a test at low temperature is specified, the specification sheets of IEC 62677-3 (all parts) may require it to be carried out at r°C or lower, where t is the requested temperature. In such cases, the operator may carry out the test at the specified temperature or any lower temperature which is convenient. If, however, at a temperature below that specified, the specimen fails to meet the requirements, the test shall be repeated at the specified temperature, subject to a tolerance of ±3 K as specified in IEC 60212. If the specimen then passes, it shall be considered to have met the requirements.
5 Standard test specimens
Moulded shape material specimens shall be prepared from (2 ± 0,15) mm thick sheets, unless otherwise specified, and shall be prepared from the same heat shrinkable material and conditions (including cross-linking) that is to be used to manufacture the heat shrinkable moulded shapes. The dimensions of the sheet shall be sufficient to enable any of the relevant tests to be performed.
NOTE A suitable size has been found to be 150 mm x 150 mm.
6 Dimensions
6.1 Number of test specimens
Three specimens of each size and style shall be tested.
6.2 Procedure
Measure the moulded shapes in the as supplied condition and after unrestricted shrinkage as specified in IEC 62677-3 (all parts). Carry out unrestricted shrinkage by conditioning in an oven for the time and temperature specified in IEC 62677-3 (all parts). Remove the shapes from the oven and allow to cool naturally to the ambient temperature specified in Clause 4.
The method of measurement can be mechanical or optical. Wall thickness shall be measured to an accuracy of ±0,05 mm and internal diameter to an accuracy of ±0,1 mm. In the case of dispute an optical method shall be used.
6.3 Result
Report all measured values as the result.
7 Heat shock
7.1 Number of test specimens Three specimens shall be tested.
7.2 Form of test specimens
Cut three specimens in accordance with Clause 10, from a test sheet in accordance with
Clause 5.
7.3 Procedure
The specimens shall be suspended vertically in an oven for 4 h ± 10 mm at the temperature
specified in IEC 62677-3 (all parts).
The specimens shall be removed and allowed to cool to room temperature. They shall then be visually examined for any signs of dripping, cracking or flowing. In addition, when so specified in IEC 62677-3 (all parts) the specimens shall be tested for tensile strength and elongation at break.
7.4 Report
Report all results from the visual examination. Report all values from the tensile strength and elongation test.
7.5 Result
The result for each property is the central value unless otherwise specified in the specification
sheets of IEC 62677-3 (all parts).
8 Bending at low temperature
8.1 Number and form of test specimens
Cut three specimens from a test sheet in accordance with Clause 5 approximately
150 mm x 6 mm.
8.2 Procedure
The specimens shall be suspended for 4 h ± 10 mm in a chamber maintained at the temperature specified in IEC 62677-3 (all parts). While still at that temperature, they shall be wound without jerking for one complete turn in a close helix round a mandrel also at the same temperature and having a diameter specified in IEC 62677-3 (all parts). The time to achieve one complete turn shall not be greater than 5 s. The specimens shall then be allowed to return to room temperature.
The specimens shall then be visually examined without magnification while still on the mandrel for signs of cracking.EN IEC 62677-2 pdf download.