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WB20CB Open and Short Locator - Overview

The WB20CB open and short locator is a highly accurate instrument designed to detect OPENS in individual conductors and SHORTS between neighbouring conductors of various type cable. As an open cable fault locator the WB20CB locates position of break in one wire of a pair using a 0 to 1kV AC power supply.

As a short locator and high voltage bridge, the unit locates the position of a short between a pair of wires using a 0 to 20kV DC power supply. The short can be a copper cross, a high resistance or an infinite resistance high voltage arc.


WB20CB Open and Short Locator

  • HV Hold - Requires the user to be at the control panel and holding the HV ON push button to provide a high voltage output for either open or short locating.
  • Ground Meters - All meters are at ground potential to help guard against shock.
  • Phase Reversal Switch.
  • Zero Start Interlock - Ensures that the voltage control adjustment is turned to zero volts when the high voltage transformer is energized.
  • Gravity Operated Solenoid - Discharges the test object when the power is turned off. This provides added safety for the operator and the instrument.
  • Three tests in one unit - Tests for discontinuities (OPENS) in either conductor in a pair of conductors and locates the position of existing SHORTS between the two conductors. Also capable of performing a DC proof test.
  • Variable HV output - Allows the location of low and high resistance shorts not possible with low voltage TDR's.
  • Rack Mountable - Easy installation into a 19-inch rack.
  • NIST Traceable - significant cost savings on outside calibrations.

Technical Specifications

System Output

AC Voltage (opens)

0 to 1kV at 20mA

DC Voltage (shorts)

0 to 20kV at 15mA

DC Polarity

Negative Output, Positive Ground


4.5-inch analog panel meters, 2% full scale accuracy

Kilovoltmeter (SHORTS)


0 to 20kV




2% full scale

Null Indicator (SHORTS)


0 25mV DC


Center Zero

Balance Control (SHORTS)

0.25%, 10 turn Potentiometer


55cm (W) x 50cm (D) x 37cm (H)






Input Voltage

* in the model number, designate 'A' for 120 Volts AC 60Hz input or 'B' for  220 Volts AC 50Hz input


Ordering Information

Haefely Hipotronics WB20CB-A

Open and Short Locator 120V AC 60Hz input

Haefely Hipotronics WB20CB-B

Open and Short Locator 220V AC 50Hz input


Optional Accessories


Spare Parts Kit


One year extended warranty


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Macey's Electrical Pty. Ltd.
ABN 17 344 601 468
Unit 1, 49 Gavenlock Road, Tuggerah, NSW Australia 2259
Phone: +61 2 4353 4644    Mobile: 0412 678 925