Common Cable Testing Methods

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There are several methods in testing cable installations. Each test has its advantages and disadvantages in assessing a cable’s condition. Below are the common methods of determining defects in cables.


Time Domain Reflectometry
This testing method lets you locate internal problems like breaks, weakened conductors or short circuits. It detects problems by injecting a short pulse into the cable and sensing for any reflected signals. It precisely locates the defect by utilizing the time of the reflected pulse to return to the tester. Since electrical signals travel at a constant speed, the tester can automatically calculate the location of the defect. However, this test only detects problems within the conductor and doesn’t effectively test the cable’s insulation.

AC Hipot Testing

This test involves applying a high AC voltage to the cable and letting it stand for a few minutes. This allows the technician to determine if the cable is suitable for operation. This test is simple because it only uses one tool for testing and gives a pass or fail result. Proper safety precaution should be exercised when using 
high voltage test equipment. It can cause flash overs that can put the technician at risk of electrocution.

Protec offers a wide selection of diagnostic instruments for cable testing. Contact us today to learn more about the rental services we offer.