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Minimum and Maximum Prospective Fault current calculations

Former Community Member
Former Community Member
hello

I am studying IET Electrical Installation and Design Guide 4th edition. and I am confused about using Cmin and Cmax to calculate Ipf and Ief. When do we use Cmin and Cmax to calculate the Minimum Prospective fault current (Ief) ??
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    The minimum credible fault current needs to be at least enough to operate the fuse or circuit breaker reliably


    The maximum needs to be  not enough to cause damage to the wiring or fuse or circuit breaker or , in the time it takes the latter it to operate.


    you may find this previous discussion helpful

    regards Mike.
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  • 0
    The minimum credible fault current needs to be at least enough to operate the fuse or circuit breaker reliably


    The maximum needs to be  not enough to cause damage to the wiring or fuse or circuit breaker or , in the time it takes the latter it to operate.


    you may find this previous discussion helpful

    regards Mike.
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