The upgraded CHANCE® Protective Ground Set Tester uses a 7.5 V direct current (DC) source to measure the resistance present in protective ground sets. The output current through the ground set is applied at a minimum of 10 amps by an internal current limiting resistor. The tester uses a four-wire approach to obtain accurate resistance measurements. The measurement system is auto-ranging to give ± 2% accuracy from 1 milliohm (mO) to 1 ohm.
The use of DC test current provides ease of use advantages over AC. There is no need to uncoil the protective ground set nor suspend it off the ground to perform the test. The efficient design functions as a milliohm meter displaying the resistance connected across the block input terminals with the press of a button.
Troubleshooting capabilities allow the user to locate areas of high resistance using the set of provided test leads.
The upgraded model C4033220 also includes block input terminals which allow for the installation of the ball studs and other input adapters in the horizontal position in addition to the vertical position present on previously manufactured models. The horizontal mounting option allows for larger ground clamps to be mounted to the tester on the sides rather than on top where the display may be blocked and sensitive components could potentially be damaged.
The power supply has also been upgraded to provide additional current flow when testing longer cables.
Obsolete Pass / Fail LEDs along with the cable size selector switch are no longer present on the upgraded model C4033220.
Charts containing the allowable resistance per foot on common cable sizes can be found within the ASTM F2249 industry standard.
Troubleshooting Mode
If a ground set does not pass the initial test, the Tester can help isolate the problems. Often, the source of high resistance can be remedied by simple repairs to the cable set. Retesting then can quickly verify the effects of repairs.
For troubleshooting mode, a pair of test leads are furnished to plug into the Tester. A selector switch activates them instead of the ball-stud terminals. The probes then are used to test across each contact interface in the ground set. The results display in milliohms, just as in the first test mode.
Optional terminals for special ground sets
The Tester’s standard ball-stud terminals accept most types of ground clamps, including Chance ball-socket clamps and duckbill clamps.
To test special-application grounding sets for underground distribution transformers or switchgear, two optional adapters shown below are available as separate items.
Instruction Manual
Click here to open the manual online
Ordering Information
Included with each CHANCE® Protective Ground Set Tester:
- Self-contained carry case
- 2 Ball-stud terminals
- Instruction manual
- 2 Troubleshooting probes
- Self-test cable
| Model# | Description | Weight |
|---|---|---|
| C4033220 | Protective Ground Set Tester | 17 lb./7.65 kg. |
Optional Adapters
| Model # | Description | Weight |
|---|---|---|
| T4033159 | Straight Stud Terminal | 3/4 lb./0.225 kg. |
| C4033449 | Elbow Adapter 15 & 25 kV for 1/2 in. probe | 1 lb./0.45 kg. |
| PSC4032947 | Elbow Adapter 35 kV for 1/2 in. probe | 1-1/4 lb./0.6 kg. |