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ciy, You should take a look at this thread, thread238-81200. It has good discussion on the Icu/Ics terminology and how to apply them in practice.

Our short circuit calculations are based on IEC 60909, and the Ik" is above 50kA but below 65kA. It would be interesting to know if or how this would relate to the NEMA Breaking Capacity. I have seen some literature from Rockwell that appears to have a similar rating scheme on some of their...

Hi All, There is a Switchboard on our project that is claimed to be rated to 65kA/1sec @ 480V as per IEC 61439. The Incomers to this Switchboard have Siemens 3VL MCCB's, and they have several short circuit ratings on the rating plate as follows; Switching Capacity As per 60947-2...