Discrimination and cascading

Discussion in 'Homework Help' started by smithbrian, Mar 25, 2013.

  1. smithbrian

    Thread Starter New Member

    Sep 3, 2012
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    Discrimination and cascading
    Hello I am a bit confused with this question. I have two circuit breakers, the upstream circuit breaker is rated for currents 100A-160A and the downstream circuit breaker is rated for currents up to 25A. It says the discrimination between the circuit breakers is up to 36kA and cascading up to 50kA.
    My questions are as follows.
    Q1. Does discrimination mean that for short circuit currents up to 36kA the downstream breaker will open first?
    Q2. Does cascading mean that for short circuit currents up to 50kA the upstream breaker will open thus clearing the fault?
    Please any help in this manner would be greatly appreciated.
     
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