Current ratings are really thermal ratings. Temperature rise in the conductor can reach a point where the insulation is damaged. Temperature rise is not instantaneous of course.
Ratings are normally specified for worst case conditions.
In your case, if you have a duty cycle that is some small percentage of 100% then you probably can achieve the max rating easily. That is assuming that the ambient temp is in a typical range, and not enclosed in a cabinet which might reach 70C.