Single-phase, three-wire, 120/240 volt AC Convertible Split neutrals extend the full length of the interior for ease of wiring Removable closing cap Minimum 100 percent neutral terminations Sturdy copper bus and galvanized box Combination slotted/Robertson screws All holes are rated for 14-4 wire UL listed FORTY-EIGHT 1/2 SPACES - (2) TGK8C GROUND KIT Amp Rating=125