Installing A Rack-Mounted System; Numbering The Vertical Rails - NEC Express5800/320Ma Installation Manual

Installing a Rack-Mounted System

Installing a Rack-Mounted System
Before installing the system, ensure that:
•
Your cabinet (if you are installing the system in your own cabinet) meets the
requirements described in the Express5800/320Ma: Site Planning Guide.
•
The site has been prepared as described in the Express5800/320Ma: Site
Planning Guide.
If you are using power distribution units (PDUs), install them in your cabinet as
described in
A rack-mounted system consists of the components shown in
To install a rack-mounted system, see the following sections:
•
"Numbering the Vertical Rails" on page 2-2
•
"Attaching Mounting Brackets to the Cabinet Vertical Rails" on page 2-5
•
"Installing the Shelf Unit" on page 2-7

Numbering the Vertical Rails

Each system requires 4U, equal to 12 holes, of vertical space.
2-2 Express5800/320Ma: System Installation Guide
Chapter 5, "Installing PDUs"
N O T E
The cabinet rails and the system are measured in EIA
rack units (U). One U equals 1.75 in. (4.45 cm).
Every three square holes on the EIA square-hole pattern
on the vertical rail equals one U. The square holes on EIA
rails are located in a repeating pattern of 1/2 in. (1.27 cm),
5/8 in. (1.59 cm), 5/8 in. (1.59 cm), as shown in
Figure 2-1.
The middle hole of each U has equal spacing between it
and the holes adjacent to it. In some cabinets, numbers on
the vertical rails identify the middle hole of each U.
before you install the system.
Figure 1-2.