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• Do not use the Product if it operates incorrectly.
• Do not touch voltages >30 V ac rms, 42 V ac peak, or 60 V dc.
• Use this Product indoors only.
• Examine the case before you use the Product. Look for cracks or missing 

plastic. Carefully look at the insulation around the terminals.

• Do not apply more than the rated voltage, between the terminals or between 

each terminal and earth ground.

• All appliances or equipment on the circuit being tested should be unplugged 

to help avoid erroneous readings.

• Do not use this Product as a comprehensive diagnostic instrument. Use it as a 

simple instrument to detect nearly all probable common improper wiring 
conditions.

• Refer all indicated problems to a qualified electrician.
• Do not use the Product to indicate the quality of ground.
• Do not use the Product to detect 2 hot wires in circuit.
• Do not use the Product to detect a combination of defects.
• Do not use the Product to indicate reversal of grounded and grounding 

conductors.

• Consult the GFCI manufacturer’s installation instructions to determine that 

the GFCI is installed in accordance with the manufacturer’s specifications.

• Check for correct wiring of receptacle and all remotely connected receptacles 

on the branch circuit.

• Operate the test button on the GFCI installed in the circuit. The GFCI must trip. 

If it does not – do not use the circuit – consult an electrician. If the GFCI does 
trip, reset the GFCI. Then, insert the Product into the receptacle to be tested.

• Push the GFCI button on the Product for a minimum of 6 seconds to test the 

GFCI condition. An audible or visible indication on the Product must cease 

Summary of Contents for ST120

Page 1: ... Socket Tester the Product see Safety Information Safety Information A Warning identifies conditions and procedures that are dangerous to the user XW Warning To prevent possible electrical shock fire or personal injury Read all safety information before you use the Product Do not alter the Product and use only as specified or the protection supplied by the Product can be compromised Do not use the...

Page 2: ...trician Do not use the Product to indicate the quality of ground Do not use the Product to detect 2 hot wires in circuit Do not use the Product to detect a combination of defects Do not use the Product to indicate reversal of grounded and grounding conductors Consult the GFCI manufacturer s installation instructions to determine that the GFCI is installed in accordance with the manufacturer s spec...

Page 3: ...o not rely on the beeper to indicate the presence of voltage Symbols Table 1 explains the symbols used on the Product and in these instructions Table 1 Symbols Symbol Description W WARNING RISK OF DANGER X WARNING HAZARDOUS VOLTAGE Risk of electric shock Consult user documentation J Earth This product complies with the WEEE Directive marking requirements The affixed label indicates that you must n...

Page 4: ...results unplug all appliances and equipment on the circuit under test 2 Plug the Product into the socket and note which indicators light 3 To determine the wiring see the diagram on the ST120 shown for reference in Figure 1 Figure 1 The Product ...

Page 5: ...go out If the GFCI does not trip or if any of the LEDs on the Product remain on there is a problem with the wiring of the socket the socket itself or the Product Consult an electrician to determine the problem Beeper ST120 only The ST120 includes a switchable beeper that emits a tone when voltage is present on the Product and the beeper is switched on To switch off the beeper slide the beeper swit...

Page 6: ...zed service center to obtain return authorization information then send the product to that Service Center with a description of the problem THIS WARRANTY IS YOUR ONLY REMEDY NO OTHER WARRANTIES SUCH AS FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSED OR IMPLIED FLUKE IS NOT LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES ARISING FROM ANY CAUSE OR THEORY Since some stat...

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