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Tensile Testing After Ageing

Cable Tensile Testing After Ageing

Cables are expected to continue to operate and perform in accordance with relevant cable standards for an extended lifecycle of up to 25 years. To ensure that prolonged use doesn't negatively affect the cable it is important to conduct tests after an accelerated ageing process.

Ageing tests determine any variation of mechanical properties, typically in cross-linked and thermoplastic compounds used as insulation and sheathing materials. It is important to note that tensile testing before ageing is undertaken to act as a baseline. 

Accelerated ageing is achieved through two methods:

CABLE TENSILE TESTING: AGEING IN AN AIR OVEN - BS EN 60811-401

Use of and air oven sees an oven with natural or pressurised air flow having not less than 8 and not more than 20 complete air changes per hour at the specified temperature.

Five test pieces as specified in BS EN 60811-501 are suspended vertically and substantially in the middle of the oven to ensure that each test piece is at least 20mm from any other test piece. The test piece shall be kept in the oven for the temperature and duration specified for the material under test. Once the ageing period has been completed, the test pieces are removed and left at ambient temperature, avoiding direct sunlight for at least 16 hours.

Determination of the mechanical properties on aged test pieces are conducted in accordance with IEC 60811-501.

Cable thermal testing in an air oven

CABLE TENSILE TESTING: AGEING IN AN AIR BOMB - BS EN 60811-412

5 sections of insulation material are prepared from the cable sample and placed into the air chamber. The 'bomb' is then filled with air to a pressure of 0.55Mpa and heated to a temperature defined in the relevant standard for the cable being tested.

The ageing process is complete once the chamber has reached the desired temperature for the time stated in the relevant cable standard. Once the ageing period has been completed, the pressure inside the air bomb is then gradually released to atmospheric pressure over a period in excess of 5 minutes - this prevents porosity or 'voids' forming in the test sample. Once the pressure is returned to normal the insulation samples are removed from the chamber and allowed to rest at ambient room temperature for a minimum of 16 hours.

These aged samples can then be subject to tensile strength testing and elongation testing according to IEC 60811-501.

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The Cable Lab®

UKAS-accredited specialist cable testing laboratory

About Eland Cables

The Cable Lab® our in-house cable testing facility, is UKAS-accredited to ISO 17025, which is the single most important standard for calibration and testing laboratories around the world. Accreditation to this international standard demonstrates our laboratory's technical competence and the accuracy of its results.

For our customers, it means peace of mind. They can have full confidence in the quality of our products and can demonstrate due diligence in selecting their cable supplier.

Our customers can also rely on the Cable Lab's services for an independent, objective and comprehensive quality assessment of cables procured from third parties.

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About Eland Cables

About Eland Cables

Established in 1975, Eland Cables is a supplier of power, data, instrumentation and control cables and cable accessories to the world's most demanding industries and to some of its most prestigious projects. Our reputation is built on an unswerving focus on quality, technical expertise and customer service.

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Our focus on quality has resulted in our in-house specialist cable testing facility securing the ISO 17025 accreditation. This certifies the competence, impartiality and performance capability of our laboratory and its evaluations. In turn, it means peace of mind for our customers with regard to the quality of the cables they source from us.

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Our highly-qualified technical team is on hand to provide technical support with all aspects of cable selection, technical specification, regulatory requirements, and bespoke cable design and manufacture.

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