Single phase, 3 wire, 24 total 1-pole spaces, 120/240 Volts ac. 12 spaces 1p, 6 spaces 2p max 1" THQL; 24 spaces 1p, 10 spaces 2p max 1/2" THQP. 22,000 AIC. Includes tin-plated copper bus, galvanized mounting rails, steel studs connect bus bar to main breaker, combo slotted/#2 Robertson screws, 100% neutral terminations, full length split neutral bondable on either side, remove tie bar to split neutral/ground. No.TGK12 or TGK24 equipment ground kit sold separately. Suitable for use as service equipment when installed in accordance with the NEC. 4 - 1/0 AWG main lug wire range. U. L. Listed, No. 67 Panelboards.