Voltstik Extension Cable Rating

SensorNote 301: Operation notes for safety and productivity

The Extension Cables used in conjunction with the SensorLink®  Radio Voltstik has the highest dielectric characteristics of any comparable product used to measure phase-to-phase in the electric utility.

The Extension Cable is designed to achieve the best possible performance at continual voltages. The design incorporates the use of conductive polyethylene (Korona-Guard) applied over the center conductor and bonded to the polyethylene dielectric material. This method provides a uniform voltage stress distribution around the center conductor and results in reduction of degradation due to internal corona. The suggested working voltage is 40,000 VDC and 80,000 VDC breakdown voltage.


SensorLink has conducted high voltage tests to confirm the dielectric characteristics of the extension cables. In the tests, 40,000 Volts AC was passed through the cable while the cable jacket was touching a metal ground plane. The test results showed no breakdown through the jacket to ground.

Insulation Thickness Chart

Other phasing sets rely on mechanical devices, such as coils and reels, to keep their extension cables safe. These competing cables are typically rated at 5,000 volts which is well below where they are typically voltage environments, and accordingly, extreme care should be exercised in make most phase-to-phase measurements.  

The Extension cable used with the SensorLink voltmeters and phasing sets is the safest phasing conductor available. Please contact any SensorLink representative for further details on this, or any other product.

Related Product Line