protective device coordination
protective device coordination
(OP)
Hi Guys,
Does the TCC Clipping current of a fuse necessarily be equal to the short circuit current?
Thanks.
Does the TCC Clipping current of a fuse necessarily be equal to the short circuit current?
Thanks.






RE: protective device coordination
The TCC or total clearing current of a fuse is determined by test and is presented as a time-current curve.
The short circuit current is a system parameter. The system impedances determine how much short circuit current will flow.
On a time-current curve, the available short circuit current is usually less than the limits of the fuse TCC curve.
RE: protective device coordination
RE: protective device coordination
RE: protective device coordination
If I am not mistaken, the term "Clipping Current" is normally used by software programs used for protection coordination(ETAP, SKM). It is the maximum short circuit or ground fault current shown in the current axis as an arrow. It is just a reference value shown for the person who is evaluating the coordination curves. So, always try to use standard terms.
In my opinion, depending on your study and the objective, the clipping current of fuse may or may not be equal to the short circuit current. Remember, coordination study is an "art work".