Overfeeding the shredder can cause damage to the shredder teeth or burning out the motor.
The capacity of a shredder is the number of pages that can be shredded at once.
Many people underestimate the amount of paper they think they will shred. It is better to buy a shredder that is a bit too large than to pay high maintenance fees for a shredder that is too small and, therefore, overworked.