Change item a) as follows: a) Stationary or drawout type of two-@ three-@ or four-pole construction with one or more rated maximum voltages of 1058 V@ 730 V@ 635 V (600 V for units incorporating fuses)@ 508 V@ and 254 V for application on systems having nominal voltages of 1000 V@ 690 V@ 600 V@ 480 V@ and 240 V respectively.