Specifications include, but are not limited to: 1. The panel assembly shall be 90 inches high by 30 inches wide and 24 inches deep formed from 11-gauge sheet steel, U.S.S. gauge commercial grade, hot-rolled, pickled, and oiled steel. The relay and control panel shall be vertical type construction with top and bottom cable entry. Flat surfaces on the plan of any panel shall not deviate more than 1/8” from the true plane, provided with rack type drilling for equipment plates to be mounted allowing the flexibility for change after the panels are installed, with allowance for 48 standard 1 ¾” rack units and shall be manufactured in accordance to GRDA Drawings. The sides shall extend to the floor, thus providing a rigid structure. 2. The relay and control panel will be a self-contained unit with factory wiring complete to conveniently located terminal blocks for the field incoming leads. The equipment plates are designed in increments of typical rack units of 1-3/4” allowing for the easy insertion of rack mounted equipment. The combination of non-rack mountable components shall be mounted on removable steel mounting plates. All of this contributes to a pleasing overall switchboard appearance that is readily accessible and easily maintainable. 3. The panel shall be bolted to a 3” channel base (5.0 lbs./ft.) with 5/8”: holes accessible for fastening to the floor. The channel shall extend under the front, both sides, and the open back. The panel shall be self-supporting. The sides and front must be permanently attached to this channel (welded is recommended). 4. The panel manufacturer shall make provisions for mounting auxiliary relays, diodes, and fuse blocks, etc., on the rear of the panels. Mounting of this equipment shall not hinder accessibility to the terminals of the front-mounted devices. All rear mounted subpanels (if required as indicated on drawings) shall be hinged in place to allow for future relocation, if required. Provisions shall be made to mount a hinged rear auxiliary equipment panel on the rear of the assembly, as required. When opened, the hinged rear panels allow free access to the back of the front panel components. The components that are mounted on the rear subpanel shall be placed on it so that when the subpanel is closed the components are inside the panel (that is not exposed to the area behind the panel).
