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Distribution Rack Requirements 49
Figure 15
Recommended Service Access
Mechanical Requirements for the Rack
Verify that your racks comply with the standards and
requirements in your cabling system plan and
conform to these conventional standards:
■
In the United States, comply with EIA Standard
RS-310C: Racks, Panels, and Associated
Equipment.
■
In countries other than the United States, comply
with IEC Standard 297: Dimensions of Panels and
Racks.
In addition, 3Com recommends that your distribution
racks meet these requirements:
■
Use an open style, 19-inch rack. The rack styles
shown in Figure 16 facilitate easy maintenance
and provide excellent ventilation.
■
Use a rack that has the universal mounting rail hole
pattern identified in IEC Standard 297.
■
Use a rack that is made of steel.
■
Install equipment in the lower half of the
distribution rack to avoid making it top heavy.
■
Use a rack that supports approximately 272 kg
(600 lb)
■
Use a rack that has adequate electrical grounding,
for instance, with a distribution rack grounding kit.
■
Verify that the floor under the rack is level within
5mm (
3
/
16
in.). Use a floor-leveling cement
compound or bolt the racks to the floor.
■
Attach the rack to the wiring closet floor with
9.5 mm (
3
/
8
in.) lag screws or equivalent hardware.
■
Brace open distribution racks if the channel
thickness is less than
6.4 mm
(
1
/
4
in.).
76 cm (30 in.)
76 cm (30 in.)