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  1. CircuitSolver

    Motor Control Center Circuit Breakers with Current Limiters

    Is it common practice to use current limiters with circuit breakers to limit short circuit current in power circuits for smaller loads fed from Motor Control Centers (MCCs)? I am finding that when sizing cables for available short-circuit currents per ICEA P-32-382-2007 that I have to upsize...
  2. CircuitSolver

    VRLA Battery Sizing

    I am specifying a 125 VDC VRLA battery that will be connected to a distribution bus that provides standby power for a UPS as well as 3 125 VDC loads. The battery operating voltage range is 105 - 140 VDC. The VRLA battery will supply standby power for 2 hrs. for a constant load of approximately...

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