HD Electric CFT-35 Cable Fault Testing Probe

• The CFT-35 is used with a voltmeter/phaser for testing installed or repaired underground cable prior to energizing it. Only cable with extruded dielectric such as rubber or polyethylene can be tested with the CFT-35. Using the CFT-35 on paper insulated cable may provide erroneous test results caused by higher leakage currents typical for this type of cable.
• In practice, the CFT-35 rectifies the high voltage from the source, usually a transformer primary, and charges up the cable, shown as a capacitor above. When a connection is first made, the DC from the CFT-35 will charge up the cable capacitance through the resistors in the meter sticks. If the cable is good, current will stop flowing when the cable is charged up. If the cable is not good, the cable will not charge and current will continue to flow, as indicated by a higher meter indication.
• The following equipment is required for testing cable with a CFT-35:

1) An HD Electric two-stick voltmeter/phaser.

2) The CFT-35 Cable Fault Tester.

3) For deadfront applications, ASP bushing probe(s) or, for live front applications, GCP-1probe(s). An EA-15/25 elbow probe may also be used for deadfront applications.

4) For deadfront applications, a feed-through bushing may also be used.