Intergraph StudioZ GT, Руководство по установке, Страница: 14 / 88

4
Understanding Vertical Units
You can identify a vertical unit (U) mark as a round hole along the edge of the side rails. Note that
it is smaller than the mounting holes used to secure equipment in a rack. The 40 U rack
additionally uses a square hole to indicate every fourth vertical unit. You should determine the
vertical mounting space within a rack enclosure for each device you wish to install. For example,
an AC distribution box can require 1 U or 2 U of mounting space, while a server requires five
vertical units (5 U), or 8.75 inches, of mounting space.
♦
A vertical unit equals 1.75 inches and consists of three mounting holes.
♦
The mounting hole diameter is 7.1 mm (industry standard).
♦
Mounting holes are counted upward after locating the first mounting hole within the range of
vertical units required to install the equipment.
The following figure shows installing a tinnerman nut to mounting hole 3 of a vertical unit.
Installing the Base Unit
CAUTION Two persons are required to perform the following procedures.
To install the base unit:
1. Remove the system base unit and mounting rails from the carton and shipping materials. Use
a helper!
Tinnerman Nut
Vertical Unit Marker
Mounting Hole 1
Mounting Hole 2
Mounting Hole 3
Mounting Hole 4