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Distribution Rack Requirements 81
Figure 30
Recommended Service Access
Mechanical Requirements for the Rack
Verify that your racks comply with the standards and
requirements as specified in your cabling system plan
and also that they conform to certain conventional
standards:
■
In the United States, use EIA Standard RS-310C:
Racks, Panels, and Associated Equipment.
■
In countries other than the United States, use
IEC Standard 297: Dimensions of Panels and Racks.
In addition, 3Com recommends that your distribution
rack meets these requirements:
■
Use an open style, 48 cm (19 in.) rack. The rack
styles shown in Figure 31 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 the rack
top-heavy.
■
Use a rack that has adequate electrical grounding,
for instance, with a distribution rack grounding kit.
Contact your network supplier.
■
Verify that the floor under the rack is level within
5mm (
3
/
16
in.). Use a floor-leveling cement
compound if necessary, or bolt the racks to the
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 (.25 in.)
76 cm (30 in.)
76 cm (30 in.)