QO® load centers offer premium features like QO® breakers, ground arc fault interrupters and surge arresters. QO® load centers enable the use of a full complement of accessories. Systems are 1 or 3 PH and have indoor and outdoor versions. Indoor enclosures are designed to rotate 180 deg. to accommodate top or bottom service entrance feed which saves expensive service cable. QO® load centers feature plated copper bus, providing superior performance and durability. This combination mounting load center cover is painted gray. This cover is for an indoor load center rated NEMA 1 with 24 spaces.