6 Installation GuideRack Installation InstructionsThis installation guide provides instructions for trained service techniciansinstalling a 48-unit (U) rack. Information includes assembling the rack,coupling two 48-U racks, and routing cables through the rack. The 48-U rackcan be installed using the recommended tools.Before attempting this installation, you should read through this entireprocedure carefully.Rack RequirementsCAUTION: The 48-U rack meets the specifications of American National StandardsInstitute (ANSI)/Electronic Industries Association (EIA) standard ANSI/EIA-310-D-92,Consumer Electronics Association (CEA) Standard CEA-310-E, InternationalElectrotechnical Commission (IEC) 297, and Deutsche Industrie Norm (DIN) 41494.Before You BeginWARNING: Before you begin installing your rack, carefully read "ImportantSafety Information," as well as the safety instructions that came with the rack.WARNING: When installing multiple systems in a rack, complete all of theprocedures for the current system before attempting to install the next system.WARNING: Rack cabinets can be extremely heavy and move easily on thecasters. The cabinet has no brakes. Use extreme caution while moving the rackcabinet. Retract the leveling feet when relocating the rack cabinet. Avoid long orsteep inclines, rough surfaces, or ramps where loss of cabinet control may occur.Extend the leveling feet for support and to prevent the cabinet from rolling.WARNING: Avoid rolling the rack cabinet over rough surfaces. Hard impacts tothe casters could cause them to break, and the rack could become unstable andtip over.WARNING: Do not attempt to move your rack with components installed. If youmove a fully loaded rack on a slightly uneven floor surface, the rack may becomeunstable and tip over.