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    Joali's Avatar
    Joali Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Feb 18, 2012, 06:32 PM
    Murray 400 amp breaker panel?
    I have a Murray 400 amp service panel. The Short Circuit Current Rating is 20,000AMPs. I need to know the Short Circuit Interrupting Rating. Can anyone help?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #2

    Feb 19, 2012, 05:09 AM
    The short circuit interrupting rating of any circuit breaker installed in that panel cannot exceed the 20kA rating of the panel.

    A panel, or any equipment that will contain a fuse or circuit breaker will have a Short Circuit Current Rating.

    A protective device, such as a fuse or circuit breaker will have a Short Circuit Interrupting Rating.

    Before you decide that the 400 amp panel you have chosen is of the proper short circuit rating, a short circuit coordination study must be done.

    To see what is involved, here is as simple as an explanation I can find, this is not for a DIY. If you're an electrician, you should know this process.

    http://www.cooperindustries.com/cont...lculations.pdf
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #3

    Feb 19, 2012, 06:17 AM
    Quote Originally Posted by Joali View Post
    I have a Murray 400 amp service panel. The Short Circuit Current Rating is 20,000AMPs. I need to know the Short Circuit Interrupting Rating. Can anyone help?
    May I ask WHY you need to know this?
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