EN 60811-512-2012 pdf download.Electric and optical fibre cables -Test methods for non-metallic materials -Part 512: Mechanical tests -Methods specific to polyethylene and polypropylene compounds -Tensile strength and elongation at break after conditioning at elevated temperature.
This Part 512 of IEC 60811 describes the procedure for testing tensile strength and elongation at break after conditioning at elevated temperature, It Is specific to polyethylene and polypropylene compounds.
This test is intended for samples from filled cables, of polyolefin insulations with a wall thickness of more than 0,8 mm and for polyolefin sheaths in direct contact with filling compound.
2 Normative references
The following documents, In whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
IEC 60811-100:2012, Electric and optical fibre cables — Test methods for non-metallic materials — Part 100: General
IEC 60811-501, Electric and optical fibre cables — Test methods for non-metallic materials — Part 501: Mechanical tests — Tests for determining the mechanical properties of insulating and sheathing compounds
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60811-1 00 apply.
4 Test method
4.1 General
This part of IEC 60811 shall be used in conjunction with IEC 60811-100.
For multicore cables not more than three cores (of different colours, if any) shall be tested unless otherwise specified in the relevant cable standard.
All the tests shall be carried out not less than 16 h after the extrusion or cross-linking, if any, of the compounds used for insulating or sheathing.
4.2 Conditioning procedure
A sample of complete cable of sufficient length shall be conditioned in air (i.e. suspended in an oven). The duration of the test and temperature of the air maintained continuously shall be as follows:
— 7 x 24 h at (60 ± 2) °C for filling compound having a nominal drop point above 50 °C and up to and including 70 °C:
— 7 x 24 h at (70 ± 2) C for filling compound having a nominal drop point above 70 °C. NOTE For an explanation of the drop poinL, see IEC 6081 1-601
After conditioning, the cable sample shall be left at ambient temperature for at least 16 h without being exposed to direct sunlight. The sheath and cores to be tested shall then be taken from the cable and shall be cleaned by suitable means
4.3 Tensile strength and elongation tests after conditioning at elevated temperature
Tensile strength and/or elongation tests, with respect to requirements in the cable standard, shall be performed on test pieces according to 4.2 in accordance with IEC 60811-501 without any further ageing treatment.
4.4 Expression of results
The median of the values of tensile strength and/or elongation at break shall be recorded as
the tensile strength and/or elongation at break.
5 Test report
The test report shall be in accordance with that given in IEC 60811-100.EN 60811-512-2012 pdf download.