Extra 1.5-in. knock-out for bundling allows maximum wiring gutter space for ease of wiring in compliance with NEC requirements. Twin neutral design located in wireway, away from circuit breakers, means easier wiring and balancing of the load. Tangential main knock-out eliminates the need for conduit offsets, which permits faster, easier installation. One-piece roll-formed metal back pan with circuit breaker alignment notches ensures accurately aligned breaker and bus tabs.