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Conductor Resistance Testing

 

Conductor Resistance cable testing is undertaken on either on a complete length of cable or on a cable sample of at least 1m in length and measured in accordance with BS EN 60228. The test determines the DC resistance of of Class 1, Class 2, Class 5 and Class 6 conductors for plain copper, metal coated copper, aluminium and aluminium alloy, circular or shaped. The standard specifies the nominal cross-sectional area, in the range 0.5mm2 to 2500mm2, and the results are expressed in ohms/km.

Conductor resistance tests for cable

In order to record an accurate measurement for the test results of the conductor resistance, the sample must be kept in the test area for sufficient time to ensure that the conductor temperature has conditioned to a level which permits an accurate determination of resistance. Conductivity is directly related to temperature and the conductor resistance testing according to BS EN 60228 is based on a conductor temperature of 20°C.

Traditionally the conductor resistance test equipment is either a Kelvin Double Bridge or a Wheatstone Bridge, using the principle of balancing the voltage across known resistors to determine the unknown resistance. Modern equipment has been developed which determines the cable conductor resistance through the principle of Ohms law, calculating the current and voltage across the sample, and from this determining the resistance.

Accuracy for this cable test is typically in the region of 0.2 to 0.5%. A formula is used to correct these measurements to 20°C and the results are then compared to the standard for each conductor type and size.

Conductor resistance is a key cable test as conductors with too high a resistance pose a safety threat. When current passes through a conductor the inherent resistance causes a heating effect - if the resistance is too high the heat of the conductor may cause the premature failure of the insulation which may in turn result in a fire or short circuit.

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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.

Quality

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.

Expert tecHnical support

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.

Complete Cable Solutions

We are a key contributor to projects in over 100 countries every year, adding value through comprehensive technical support, reliable logistics, innovative solutions, and a customer-centric approach.

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