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    GFCI circuit breaker trips after UPS or SurgeArrest

    Issue:
    GFI outlet, circuit breaker trips after UPS or SurgeArrest is connected.

    Product Line:
    Back-UPS Models ES,CS,NS,XS and RS. Surge Surpressors; All Product Families

    Environment:
    Surge or Back-UPS plugged in to GFCI outlet.

    Cause:
    A ground fault interrupter (GFI) is a safety device required by the National
    Electrical Code. Its purpose is to avert personal injury.
    Some GFI devices are poorly calibrated and trip prematurely.

    Resolution:
    You can try to replace the GFCI device and see if this solves the problem.
    Try a different brand if possible. If the outlet is not in a bathroom or kitchen, you can consider changing the circuit to a non-GFCI receptacle or breaker. The circuit breaker type GFCI devices are generally of higher quality and are recommended as being more immune to this type of problem.

    There are thousands of successful installations of UPS and computer equipment with GFCIs.



    Background:

    Ground fault interrupters come in two forms: mounted in a wall receptacle or

    mounted in the circuit breaker panel. The ones in the wall receptacles can be

    seen in any hotel bathroom and can be identified because they have a small

    ""reset"" button on them (usually colored red). The ones in the circuit breaker

    panel look similar to regular circuit breakers, with the exception that they

    too have a small ""reset"" button.



    A ground fault interrupter senses any leakage current to ground on the circuit

    into which it is connected. Its function is to detect any currents which might

    occur as a result of, say dropping a hair dryer into a bathtub. Such currents

    could potentially fatally harm someone but not be large enough to trip the

    circuit breaker on overcurrent.



    GFI devices are typically installed in kitchen and bathroom areas, but

    sometimes they are used throughout a facility or home.



    UPS systems and computer equipment exhibit leakage currents. These currents

    are a natural result of the common mode filters present in computers and UPSs.

    These leakage currents may be large enough to ""fool"" the GFCI and cause it to

    trip. When this happens the UPS will go to battery because the GFCI will cut

    power to the UPS or computer. The UPS passes the cumulative leakage current of

    all of the connected loads back to the GFCI device."

     

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