Introduction
The Greenlee GT-10GFI Circuit Tester is a compact and reliable tool designed for quickly troubleshooting 120 VAC grounded outlets and testing GFCI (Ground Fault Circuit Interrupter) receptacles. This device helps identify common wiring faults, ensuring outlets are correctly grounded and wired. Its user-friendly design features clear LED indicators for easy interpretation of outlet status.
Safety Information
Always exercise caution when working with electrical circuits. Read and understand all instructions before using this tester. Do not use the tester if it appears damaged. Ensure hands are dry before handling the tester or any electrical outlet. This tester is designed for 120 VAC grounded outlets only. Do not attempt to use it on circuits with different voltage or configuration.
- Always disconnect power before performing any wiring changes.
- Do not use the tester in wet conditions.
- This tester is for diagnostic purposes only and should not be used as a substitute for professional electrical inspection.
Product Overview
Figure 1: The Greenlee GT-10GFI Circuit Tester, showing its compact design and indicator lights.
The GT-10GFI is a compact, cube-shaped circuit tester designed for ease of use. It features three prongs for insertion into a standard 3-wire grounded outlet. The front of the tester includes a legend for interpreting the LED light patterns, and a yellow button for testing GFCI receptacles.
Key components include:
- Three-Prong Plug: For insertion into 120 VAC grounded outlets.
- LED Indicators: Seven distinct light patterns to indicate various wiring conditions.
- GFCI Test Button: A yellow button used to trip and test GFCI receptacles.
Setup
The Greenlee GT-10GFI Circuit Tester requires no complex setup. It is ready for use directly out of the packaging. No batteries are required as it draws power directly from the outlet being tested.
- Ensure the outlet you intend to test is a standard 120 VAC, 3-wire grounded receptacle.
- Visually inspect the tester for any signs of damage before use.
Operating Instructions
Testing a Standard Outlet:
Figure 2: The GT-10GFI tester inserted into a standard electrical outlet for testing.
- Insert the three prongs of the GT-10GFI tester fully into the outlet.
- Observe the pattern of the LED indicator lights on the tester.
- Refer to the indicator chart below or on the tester itself to interpret the wiring condition.
Interpreting LED Indicators:
Figure 3: Close-up view of the LED indicator legend on the GT-10GFI tester, showing light patterns for various wiring conditions.
| Light Pattern (Left to Right) | Wiring Condition |
|---|---|
| Off, Off, On | Open Ground |
| Off, On, Off | Open Neutral |
| On, Off, Off | Open Hot |
| On, Off, On | Hot & Ground Reversed |
| Off, On, On | Hot & Neutral Reversed |
| On, On, Off | Correct Wiring |
Note: "On" indicates the lamp is illuminated.
Testing a GFCI Receptacle:
- Insert the GT-10GFI tester into the GFCI receptacle.
- Observe the LED indicators to confirm correct wiring (should show "Correct Wiring").
- Press the yellow GFCI test button on the tester.
- A working GFCI receptacle should trip, cutting power to the outlet and causing the tester's lights to go out. The GFCI's "RESET" button should pop out.
- If the GFCI does not trip, it may be faulty or incorrectly wired.
- To restore power, press the "RESET" button on the GFCI receptacle.
Troubleshooting
The GT-10GFI tester provides immediate visual feedback for common wiring issues. If the tester indicates a fault, it is recommended to consult a qualified electrician for diagnosis and repair.
- No Lights: If no lights illuminate when plugged into a live outlet, check if the circuit breaker is tripped. If the circuit is live and the tester shows no lights, the tester may be faulty.
- Incorrect Wiring Indication: If the tester indicates "Open Ground," "Open Neutral," "Open Hot," "Hot & Ground Reversed," or "Hot & Neutral Reversed," this signifies a wiring fault that needs to be addressed by a professional.
- GFCI Does Not Trip: If the GFCI test button is pressed and the GFCI receptacle does not trip, the GFCI unit itself may be defective or improperly wired. This requires immediate attention from a qualified electrician.
Specifications
| Specification | Detail |
|---|---|
| Model | GT-10GFI |
| Brand | Greenlee |
| Power Source | AC |
| Voltage | 120 Volts |
| Color | Black |
| Item Weight | 2.72 ounces |
| Product Dimensions (L x W x H) | 8 x 8 x 8 inches |
| Safety Standard | ETL |
| UPC | 078331121251, 763615875462, 733353291121, 783310121251 |
Maintenance
The Greenlee GT-10GFI Circuit Tester requires minimal maintenance. To ensure its longevity and accurate performance:
- Keep the tester clean and free from dust and debris. Wipe with a dry cloth as needed.
- Store the tester in a dry environment, away from extreme temperatures and direct sunlight.
- Avoid dropping the tester or subjecting it to harsh impacts, as this can damage internal components.
- Periodically inspect the prongs for bending or corrosion.
Warranty and Support
The Greenlee GT-10GFI Circuit Tester comes with a 1-year manufacturer's warranty. For warranty claims, technical support, or further inquiries, please refer to the official Greenlee website or contact their customer service department.
For more information, visit the Greenlee Store on Amazon.
