Toa N-8000 Series Ver.1.41 - Manual (Page 98)

3-2
Chapter 3: INSTALLATION & WIRING
1. INSTALLATION OF THE EXCHANGE
The Exchange can be installed in any of three ways: (1) equipment rack mounting, (2) wall mounting, and (3)
desk-top installation.
1.1. Equipment Rack Mounting
A) Elevated Operating Ambient - If installed in a closed or multi-unit rack assembly, the operating ambient
temperature of the rack environment may be greater than room ambient. Therefore, consideration should
be given to installing the equipment in an environment compatible with the maximum ambient temperature
(Tma) specified by the manufacturer.
B) Reduced Air Flow - Installation of the equipment in a rack should be such that the amount of air flow
required for safe operation of the equipment is not compromised.
C) Mechanical Loading - Mounting of the equipment in the rack should be such that a hazardous condition is
not achieved due to uneven mechanical loading.
D) Circuit Overloading - Consideration should be given to the connection of the equipment to the supply circuit
and the effect that overloading of the circuits might have on overcurrent protection and supply wiring.
Appropriate consideration of equipment nameplate ratings should be used when addressing this concern.
E) Reliable Earthing - Reliable earthing of rack-mounted equipment should be maintained. Particular attention
should be given to supply connections other than direct connections to the branch circuit (e.g. use of power
strips)."
The Exchange can be mounted on the CR-273 or CR-413 or standard EIA 19" Equipment rack.
One CR-273 for up to 128 stations, one CR-413 for up to 192 stations and seven CR-413 for up to a total of
1280 stations can be connected. (Refer to
p. 1-8 .)
For the CR-273 and CR-413 Equipment rack assembly or BU-412 Blower unit installation, read the installation
manual supplied with the rack.
Note
When installing the Blower units, Terminal boards, and
Exchanges, lay the equipment rack down face-up to do
installation work safely. Since the Blower unit is installed
from the inside of the rack, be sure to install it first, before
mounting the other components.
1.1.1. Setting space
For maintenance works, allow much space between the
wall and Equipment rack.
Perforated panel
Equipment rack
Exchange
Exchange
50 cm 50 cm
1 m
50 cm
CAUTION
Do not block the fan exhaust vent. Doing so may cause heat to build up
inside the unit and result in fire.
1.1.2. Caution when installing the unit
Do not stack up 3 Exchanges or more.
If 2 or more Exchanges are mounted in the
Equipment rack, be sure to mount the
perforated panel of 1-unit size (PF-013B) or
more above and below every 2 Exchanges.
Using the supplied rack mounting screws,
install the terminal board in a location that
facilitates wiring and maintenance work, taking
into consideration the direction of cable entry
into the rack.