3com 10005622 Manuel D’Utilisation

Figure B-1   Recommended Service Access

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 B-2 facilitate easy maintenance 
and provide excellent ventilation.

■

Use a rack that has the universal mounting rail 
hole pattern identified in IEC Standard 297. See 
Figure 2-3 for a description of the universal 
mounting hole pattern.

■

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 
5 mm (

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.)