My gfci wont trip with tester?
I replaced a bad GFi in my house and now it is wired correctly and the it will trip using the test button but will not trip with an external tester. Why would it do this?
Since every GFCI has an integral "test button," the first and most important test is simply to push the test button after energizing the circuit. The internal test circuit performs a complete test of the functionality of the GFCI. Since each GFCI is required by UL to undergo an end-of-line calibration test to assure that the GFCI is tripping within the prescribed 4mA to 6mA trip threshold within the defined clear time, it should not be necessary to check calibration in the field.
Line-load miswiring. You can easily verify with no special test instruments that line terminations have been made properly. Simply insert a night light (or a circuit tester) into the Gfci Receptacle. Push the "test button." If the GFCI trips but the night light or circuit tester stays energized, the GFCI receptacle is wired with reverse line-load connections. The GFCI needs to be removed and properly wired.
Some GFCI receptacles have an integral light that can indicate line-load reversed wiring. With this type of GFCI receptacle, you don't even need a night light; they will indicate line-load reversal when the GFCI test button is pushed.The GFCI trips but the indicator light stays illuminated, indicating that the receptacle is energized even though the GFCI tripped. Since some GFCI receptacles have indicator lights that are normally illuminated when the GFCI trips (the reverse of the type previously described), care must be taken to read and understand the instructions of the GFCI being installed.
GFCI testers. If you're from Missouri and simply don't believe the internal test circuit, then you need to exercise care in selecting the GFCI tester and in interpreting the results. It wasn't until the 1993 Edition of UL 1436, Safety Standard for Outlet Testers and Similar Devices, that the requirements for GFCI testers were coordinated with the requirements for GFCIs themselves. Testers that are not UL listed and UL-listed testers produced prior to 1993 may contain test circuits that do not properly test the GFCI. Indeed, they may indicate an unsatisfactory test when the GFCI is functioning fully in accordance with the UL GFCI standard.
Some testers not meeting UL 1436-1993 have timing circuits that limit the test current to a duration of 200 ms. If the GFCI takes more than 200 ms to trip (as permitted by UL), these testers may never trip some GFCIs that are in full compliance with UL requirements. Therefore, if you choose to use a GFCI tester, make sure it's listed to the 1993 Edition of UL 1436.
Some GFCI testers are relatively simple circuit testers with an additional test button. Others have milliammeters or dials that can be used to select various test currents. When using any of these more sophisticated testers, do not assume that it's accurately checking the calibration of the GFCI. There is very likely some capacitive leakage and possibly some harmless ground fault leakage "preloading" the GFCI. Consequently, a GFCI that is tripping within the UL time/current requirements may, according to the tester, be tripping at 3mA. In this case, the tester is simply giving a misleading reading.
Reverse polarity. Since testers establish a test circuit between hot and equipment ground, if the receptacle into which the tester is plugged is wired with reverse polarity, there will not be a voltage across the tester and test current will not flow. The GFCI will not trip and thus the GFCI might erroneously be considered defective.
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