This main terminal box provides 3 phases in, 3 phases out for a 4 wire configuration. It accepts 208Y/120VAC and 240/120VAC delta incoming service from OH or UG feeds. The unit is rated for 400A with a copper busbar. Eaton Main Terminal Box, 600A, Copper, NEMA 3R, Overhead/underground, Four-wire, Three-phase, 120/208V, (2) 250-500 kcmil Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first. The main devices are available as main circuit breakers, main fusible switches, or main lug terminal boxes. Gangable metering is used in large condominiums, strip malls or other applications where more than six units are metered. Please log in or sign up to start adding items to your cart. Typical applications, both indoor and outdoor, include inter-building wiring on farms, convenient splicing means for industrial use and.