This test (often called the dielectric voltage withstand) determines the dielectric integrity of the cable insulation. Dielectric integrity is determined by placing the wire/cable in a water bath. An AC voltage potential is applied across the insulation between a wire/cable conductor and the ground. This test is typically run as part of posttest assessment procedures to evaluate the sample’s insulation/jacket integrity after an environmental or other type of test.
The benefits of performing this test include:
- Determine if there are any imperfections in the sample insulation/jacket and the voltage at which there was insulation breakdown.
- Identify if the sample can withstand the specified voltage.
- Provide information to support a voltage rating (a common method for defining voltage rating is to divide the dielectric voltage withstand test value by two, then subtract 500 (e.g. (0.5 * 2.5kV) – 500V = 750V, where 2.5kV is the dielectric voltage withstand test value).
Lectromec currently has the capability to test up to 15.0kVAC.