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Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter2 Installing the Server
Preparing for Server Installation
Rack Requirements
This section provides the requirements for the standard open racks, assuming an external ambient air
temperature range of 41°F to 95°F (5°C to 35°C).
The rack must be of the following type:
•A standard 19-in. (48.3-cm) wide, four-post EIA rack, with mounting posts that conform to English
universal hole spacing, per section 1 of ANSI/EIA-310-D-1992.
•The rack post holes can be square 0.38-inch (9.6 mm), round 0.28-inch (7.1 mm), #12-24 UNC, or
#10-32 UNC when you use the supplied slide rails.
•The minimum vertical rack space per server must be two RUs, equal to 3.5 in. (88.9 mm).
Equipment Requirements
The slide rails supplied by Cisco Systems for this server do not require tools for installation if you install
them in a rack that has square 0.38-inch (9.6 mm), round 0.28-inch (7.1 mm), or #12-24 UNC threaded
holes. The inner rails (mounting brackets) are preattached to the sides of the server.
However, if you install the slide rails in a rack that has #10-32 round holes, a flat-bladed screwdriver is
required to remove the larger square or round mounting pegs from the front of the slide rails.
Slide Rail Adjustment Range
The slide rails for this server have an adjustment range of 26 to 36 inches (660 to 914 mm).