electrical4u.com logo Home MCQ Engineering Calculators Videos Basic Electrical Circuit Theories Electrical Laws Materials Batteries Illumination Generation Transmission Distribution Switchgear Protection Measurement Control System Utilities Safety Transformer Motor Generator Electrical Drives Electronics Devices Power Electronics Digital Electronics Biomedical Instrumentation

Conductor Resistance Test of Electrical Power Cables

Published on 24/2/2012 & updated on 16/8/2018
This test is used to determine the DC resistance of copper or aluminum conductors. Resistance of a conductor tells us how easily a conductor allows the flow of current through it. Higher the resistance, lesser the current will flow though the conductor. Resistance of a conductor is influenced by conductor dimension and construction, conditions like, temperature and resistivity. It is normally expressed as ohms per km.
This test will make use of either Kelvin Double Bridge with accuracy of 0.2 percent or Wheatstone Bridge with accuracy of 0.5 percent. Test specimen is selected as indicated below.

Note - The length of the test specimen is the length which lies between the potential terminals.

Related pages
Conductor Resistance Test of Electrical Power Cables

Procedure of Conductor Resistance Test

Connect the specimen to the resistance measuring bridge and make sure that proper considerations are taken into account about the contact resistance. Measure the resistance and note down the temperature. Measured resistance is converted to the standard temperature and length.

Observation and Report

Sample noNominal conductor size in mm2Length (m)Material Al/CuClass of conductorTemperature oCObserved ResistanceSpecified Resistance
- - - - - - - -
- - - - - - - -
- - - - - - - -


Observed Resistance at a particular temperature, Where, Rt = Observed Resistance K = Temperature correction factor L = Length of specimen in m. Conclusion - The sample meets/does not meet the requirements of the specification.

Please Rate this Article
⚑ 3 total

New Articles
More Articles on Transmission
Transmission EffectCapacitor BankSubstationInsulatorTowerEarthingPower SystemReactorPerformance of Transmission LineTransmission LinePower System Stability
Articles Categories
Write for Us
Basic Electrical
Electric Transformer
Electric Generator
Electric Motor
Electrical MCQ
Engineering Calculators
Video Lectures
Electrical Generation
Electric Transmission
Electric Protection
Electrical Measurement
Electronics Devices
Power Electronics
Digital Electronics