How much transformer is needed to build an 8-12 tons per hour feed production line (420 feed line)? Can it be overloaded? How much can it exceed?

Set an 8-12 tons per hour animal feed production line (420 feed line), usually equipped with a 400 kw transformer, it is best not to overload, if due to special circumstances or production needs, it is best not to exceed 20% of the total power, that is 480 kw.