Electrical Testing

DC RESISTANCE BRIDGE

 

Purpose

To evaluate electrical properties of Lapp wire to ensure that these products retain critical conductor resistance qualification values when subjected to high voltage conditions. These tests are performed to certify compliance with Lapp DC Resistance Conductor Attributes, Industry tests and Safety agency standards.

 

TECHNICAL DETAIL

Several wire samples are cut to a specified length and then are straightened if any bends or curves are apparent. Specimens are stripped at both ends and at certain intervals exposing the conductor along the sample length. A continuous voltage source is applied to each sample for a specified period of time after it has been clamped in the device.  Upon completion of the voltage application cycle the temperature adjusted value for the DC resistance is obtained. Test results are compared to standard requirements electronically to avoid potential error and insure accuracy.

 

REGULATORY STANDARD

  • UL 1581

INSULATION RESISTANCE

 

Purpose

To evaluate electrical properties of Lapp wire and insure that these products retain critical insulation resistance qualification values when subjected to wet high temperature conditions. These tests are performed to certify compliance with Lapp Insulation Resistance Cable Attributes, Industry Tests and Safety Agency Standards.

 

TECHNICAL DETAIL

Several wire samples are cut to a specified length, coiled and then are stripped at both ends to expose the conductor. Specimens are then placed in a circulating high temperature water bath with both test ends extending out of the water bath. A continuous voltage source is applied to each sample for specified period of time while submerged in the high temperature water bath. At set intervals measurements of insulation resistance are recorded for each sample. These values are then plotted graphically to define insulation resistance characteristics. Completion of the test is determined by the final value recorded. Test results are compared to standard requirements electronically to avoid potential error and ensure accuracy.

 

INDUSTRY REGULATORY STANDARDS

  • UL 83
  • UL 1581