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Looking for high current testing standard for breakers

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  1. SecondGen's Avatar
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    There isn't anything I know of that comes directly from NETA covering circuit breaker primary injection testing procedures. NETA specs usually tell you to consult manufacturers recommendations for specific procedures.
    Last edited by SecondGen; June 15, 2015 at 04:21 AM.

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  3. CoDylan is offline
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    NETA Tests for Low-Voltage Power Circuit Breaker (LSIG):
    1. Determine long-time pickup and delay by primary current injection.
    2. Determine short-time pickup and delay by primary current injection.
    3. Determine ground-fault pickup and delay by primary current injection.
    4. Determine instantaneous pickup current by primary current injection.

    NETA Test Results for Low-Voltage Power Circuit Breaker (LSIG):
    1. Long-time pickup values should be as specified, and the trip characteristic shall not exceed manufacturer’s published time-current characteristic tolerance band.
    2. Short-time pickup values should be as specified, and the trip characteristic should not exceed manufacturer’s published time-current tolerance band.
    3. Ground fault pickup values should be as specified, and the trip characteristic should not exceed manufacturer’s published time-current tolerance band.
    4. Instantaneous pickup values should be within the tolerances of manufacturer’s published data.

    The reason why there is not a test percentage within the NETA specifications is that the expectation is the unit will function as specified at any point of the time-current curve or manufacturer's tolerance, not just at one specific value. Although it is common industry practice to test long time at 300% of pickup and short time and ground fault at 150% of pickup. Instantaneous is per the curve tolerance.

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    ANSI/NETA ATS

    TABLE 100.7 deals with Inverse Time Trip Tests
    at 300% of Rated Continuous Current Molded-Case Circuit Breakers.
    Maximum trip times

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    ANSI/NETA ATS cont.

    TABLE 100.8 deals with Instantaneous Trip Tolerances
    for Field Testing of Circuit Breakers

  8. #15
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    NFPA-70B explains low voltage breaker testing a little clearer than NETA.

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