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Correct way to rate a switch board IEC 60439-1.

Correct way to rate a switch board IEC 60439-1.

Correct way to rate a switch board IEC 60439-1.

(OP)
Can some please tell me the correct way to rate a low voltage switch board/panel in accordance to IEC 60439-1.
I have seen the Icw used but now I am told to use the term  Icc, (page 43 of IEC 60439-1). I do not think this is correct; I would have liked to use the Icw & the Ics of the main breaker.
In  99.9% of the time  I will NOT know the potential fault current at the input terminals of the panel.

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