3Com CoreBuilder 3500, Руководство по началу работы

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80 A
PPENDIX
C: S
ITE
R
EQUIREMENTS AND
S
AFETY
C
ODES
■
Be sure that each wiring closet has a suitable
ground. Ground all metal racks, enclosures, boxes,
and raceways in the closet.
■
Use AC power, 15-amp service receptacles, type
N5/15 or NEMA 5-15R for 120VAC, and the other
system specifications shown in Appendix A.
■
Be especially sure to meet all system environmental
requirements in Appendix A, such as ambient
temperature and humidity.
■
Be sure that the ventilation in the wiring closet is
adequate to maintain a temperature below
40 °C (104 °F).
■
Install a reliable air conditioning and ventilation
system if you plan to have two or more systems in
a single wiring closet.
■
During nonbusiness hours, guard against an
accidental shutdown of the ventilation while a
system remains powered up; the equipment might
overheat.
Distribution Rack Requirements
If you plan to mount your systems in a distribution
rack, your rack must meet the basic mechanical and
space requirements described in this section.
Protective Grounding for the Rack
Proper distribution rack grounding ensures that
voltages induced into wiring by lightning or other
disturbances are directed to ground. Normally, you
use a distribution rack grounding kit and a ground
conductor that is carried back to earth or to another
suitable building ground. To order the grounding kit,
contact your network supplier.
Space Requirements for the Rack
Provide enough space in front of and behind the
system so that you can service it easily. Allow a
minimum of 76 cm (30 in.) between the rack and any
wall behind or in front of it. Extra room on each side
is optional. See Figure 30.